Huadong Engineering Corporation Ltd

Hangzhou, China

Huadong Engineering Corporation Ltd

Hangzhou, China
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Wang Z.M.,Zhejiang University | Huang Y.J.,Zhejiang University | Huang Y.J.,Zhejiang Province Institute of Architectural Design and Research | Yang Z.J.,Zhejiang University | And 2 more authors.
Construction and Building Materials | Year: 2017

This study develops an efficient numerical homogenisation approach for meso-scale concrete samples with randomly generated and packed aggregates and pores. A simple algorithm is devised to discretize samples into meshes consisting of semi-analytical scaled boundary finite element (SBFE) polygons only. As each aggregate is modelled by one SBFE polygon and only polygonal boundaries are discretized into nodes, the degrees of freedom of a model is significantly reduced compared with conventional finite element models. The volumetrically averaged stress inside a SBFE polygon is semi-analytically integrated, leading to high accuracy in the homogenised elastic properties. The effects of model size and porosity are statistically studied by extensive Monte Carlo simulations. A size effect law taking porosity into account is proposed to predict effective elastic moduli in good agreement with experimental data up to 200 mm model size. The meso-models are found statistically homogeneous when the size is about 4.5 times the maximum aggregate size. © 2017 Elsevier Ltd


Zhao G.,Huadong Engineering Corporation Ltd. | Wang D.,Southwest Jiaotong University | Gao B.,Southwest Jiaotong University | Wang S.,CAS Institute of Geology and Geophysics
Engineering Geology | Year: 2017

Rock burst is a geological hazard that occurs when hard and brittle rock mass is excavated under high in situ geo-stress or in the presence of high-stress concentration. This paper presents a case study of rock bursts that occurred in the Qirehataer Diversion Tunnel excavation project in gneissic granite. The tunnel is 15.66 km long at a maximum depth of 1720 m below the ground surface, many rock bursts occurred over the total length of 4071.5 m. Detailed geological settings, in situ and laboratory test data, as well as the method that is used to interpret the test data to obtain the threshold parameters used for classification criteria, are introduced. A database consisting of 29 rock bursts and classifications using the three criteria is compiled. Based on the database, the criteria are modified to obtain consistent classifications. Evaluation of the modifications and application of the modified criteria to rock bursts in a case study indicate that the consistency of classifications is greatly enhanced. © 2016 Elsevier B.V.


News Article | November 15, 2016
Site: www.marketwired.com

MONTRÉAL, QUÉBEC--(Marketwired - Nov. 15, 2016) - Oceanic Iron Ore Corp ("Oceanic" or the "Company") (TSX VENTURE:FEO) is pleased to provide a corporate update on the Company's progress to shareholders and stakeholders of the Company. SNC JOINS POWER CHINA IN THE PREPARATION OF THE HOPES ADVANCE ENGINEERING, PROCUREMENT AND CONSTRUCTION ("EPC") PROPOSAL Montréal based SNC Lavalin Inc. ("SNC") and Power China Huadong Engineering Corporation Ltd. ("Power China") have entered into a Memorandum of Understanding ("MOU") in respect of a cooperative association in the preparation of an EPC proposal related to the Company's wholly owned Hopes Advance project ("Project"). The MOU was executed November 15, 2016. Power China and Oceanic acknowledge the importance of a cooperative effort which aims to incorporate the unique skills and knowledge of SNC, in respect of Québec standards and certification, as well as its knowledge of local conditions and legislation, into the future cooperative undertaking of their individual and combined capability in regards to project engineering, procurement, and construction. Power China evaluated several Québec-centered local engineering and EPC firms before concluding its arrangement with SNC. The Company is pleased with the outcome. In recognition of the time taken to conclude the SNL Power China association, and to facilitate additional evaluation and detail in its EPC Proposal the Company and the EPC service providers have mutually agreed to revise the submission deadline for the EPC proposal from November 30, 2016 to March 31, 2017. Power China reports that it has dedicated a team of approximately 20 engineers and specialized personnel to the Hopes Advance project since completing their site investigation and Canadian meetings during early October. This effort will now be augmented with the participation of SNC. WSP Canada Inc. ("WSP"), aided by local Inuit employees and enterprises, has successfully completed the baseline data collection work previously announced by Oceanic in the Company's press release of September 15, 2016. The program was completed on schedule and on budget. The Power China - SNC association will not affect the direction that the Company has been progressing in respect of its environmental assessment obligations. Oceanic intends to have WSP complete the remaining baseline data collection work and the preparation and submission of the project's Environmental Impact Statement. 154619 Canada Inc., a company controlled by Mr. Peter Ferderber, has agreed to defer the annual $100,000 advance royalty payment due later this month to a later date in the same manner agreed to last year. Subsequent to the 2015 deferral, Oceanic and 154619 Canada Inc. settled the 2015 payment obligation and as a consequence the Company is current with its advanced royalty payments with 154619 Canada Inc. prior to the current deferral. Oceanic has also initiated discussion with SPG Royalties Inc. ("SPG") the only other current royalty holder regarding its $100,000 advance royalty payment with the objective of avoiding the use of cash in the settlement of the 2016 payment. The discussion is continuing and the Company will report on the outcome once SPG and Oceanic arrive at an agreement. The benchmark pricing for iron ore has improved by approximately 75% since the start of the year with current spot pricing for Hopes Advance quality iron ore in the range of USD $95/ tonne CFR China. Prices have gained significantly since the outcome of the American presidential election, as it becomes clearer that the United States, Canada, and other regional jurisdictions, intend to incorporate infrastructure spending as a significant measure in stimulating employment and economic growth. Management believes that while there may be some volatility in pricing in the near term, the general trend for bulk commodities (and metals), and particularly seaborne sources of high quality iron ore products, such as those planned to be produced by the Company, will see increasing demand as overall needs increase within the context of a general decline in quality that has been progressing globally in the seaborne market for much of the past two decades. The announced increases in infrastructure spending and resulting pricing gains, along with the relative currency exchange gains when translating US currency to Canadian currency, presently favourable at $1.36 CAD : USD, are expected to influence the project's economics positively when compared to the currency assumptions and sensitivity analysis that were contained in the Company's Pre-feasibility Study which assumed Canadian and US currencies at par. The Company is optimistic that, assuming governments follow through on their infrastructure commitments, the demand in the sector may be significantly more robust than it has been during the past few years. Alan Gorman, President and CEO of Oceanic commented: "We are pleased with the concrete progress the Company has managed given the past context of the iron sector and our restraint in the use of available cash which has been prioritized and dedicated to expenditures integral to the critical path of the project's overall development. With the recent and growing commitments of some G20 countries in respect of infrastructure spending, we believe there is cause for optimism. Oceanic is very pleased with Power China's selection for an association with SNC Lavalin going forward and we look ahead to assisting in the development of the EPC proposal. On behalf of the Company's directors we would be remiss not to acknowledge the support and patience of stakeholders and shareholders, as well as the project's royalty holders and the Company's service providers as we set forth to continue to add value while minimizing expenditures during the past couple of years. Oceanic remains committed to the creation and realization of significant value that is sustainable in respect of the project's benefits and impacts." On behalf of the Board of Directors This news release includes certain "Forward-Looking Statements" as that term is used in applicable securities law. All statements included herein, other than statements of historical fact, including, without limitation, statements regarding potential mineralization and resources, exploration results, and future plans and objectives of Oceanic Iron Ore Corp. ("Oceanic", or the "Company"), are forward-looking statements that involve various risks and uncertainties. In certain cases, forward-looking statements can be identified by the use of words such as "plans", "expects" or "does not expect", "scheduled", "believes", or variations of such words and phrases or statements that certain actions, events or results "potentially", "may", "could", "would", "might" or "will" be taken, occur or be achieved. There can be no assurance that such statements will prove to be accurate, and actual results could differ materially from those expressed or implied by such statements. Forward-looking statements are based on certain assumptions that management believes are reasonable at the time they are made. In making the forward-looking statements in this presentation, the Company has applied several material assumptions, including, but not limited to, the assumption that: (1) there being no significant disruptions affecting operations, whether due to labour/supply disruptions, damage to equipment or otherwise; (2) permitting, development, expansion and power supply proceeding on a basis consistent with the Company's current expectations; (3) certain price assumptions for iron ore; (4) prices for availability of natural gas, fuel oil, electricity, parts and equipment and other key supplies remaining consistent with current levels; (5) the accuracy of current mineral resource estimates on the Company's property; and (6) labour and material costs increasing on a basis consistent with the Company's current expectations. Important factors that could cause actual results to differ materially from the Company's expectations are disclosed under the heading "Risks and Uncertainties " in the Company's MD&A filed August 25, 2016 (a copy of which is publicly available on SEDAR at www.sedar.com under the Company's profile) and elsewhere in documents filed from time to time, including MD&A, with the TSX Venture Exchange and other regulatory authorities. Such factors include, among others, risks related to the ability of the Company to obtain necessary financing and adequate insurance; the economy generally; fluctuations in the currency markets; fluctuations in the spot and forward price of iron ore or certain other commodities (e.g., diesel fuel and electricity); changes in interest rates; disruption to the credit markets and delays in obtaining financing; the possibility of cost overruns or unanticipated expenses; employee relations. Accordingly, readers are advised not to place undue reliance on Forward-Looking Statements. Except as required under applicable securities legislation, the Company undertakes no obligation to publicly update or revise Forward-Looking Statements, whether as a result of new information, future events or otherwise. Neither the TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this release.


Zhou H.,Shanghai JiaoTong University | Zhou H.,Huadong Engineering Corporation | Wan D.-C.,Shanghai JiaoTong University
Shuidonglixue Yanjiu yu Jinzhan/Chinese Journal of Hydrodynamics Ser. A | Year: 2014

The numerical simulation of the unsteady flow around wind turbines with different blades numbers are conducted with the Arbitrary Mesh Interface Method based on the free source OpenFOAM software. The turbulence model k-ω SST and unstructured grid are chosen to analyze the difference between aerodynamics of two blades and three blades wind turbine under different wind conditions. Detailed numerical results of vortex structure, thrust, torque and pressure distribution of different wind turbine were presented. These results are important to the finite element analysis and the design and research of wind turbines with different blades numbers.


Fang X.,Zhejiang University | Fang X.,Hangzhou Electric Power | Fang X.,Huadong Engineering Co. | Yang Q.,Zhejiang University | And 2 more authors.
Applied Energy | Year: 2016

As various forms of renewable distributed generators (DGs) embedded in microgrids (MGs) often exhibit unstable characteristics, matching the generation to the demand whilst optimally utilizing the DGs is a non-trivial task. This paper investigates the optimal coordinated operation of multiple autonomous MGs and reveals the potential technical benefit. The proposed solution identifies the optimal network topologies and allocates the critical loads (CLs) to appropriate DGs based on the minimum spanning tree (MST) algorithm with power loss and reliability considerations. The non-critical loads (NLs) are determined to be supplied by the MGs based on the Linear Matrix Inequality (LMI) approach, which effectively improves the global utilization efficiency of DGs. Through the event-driven resource reallocation across multiple cooperative MGs, the dynamic balance between the power generation and demand can be attempted. The proposed approach is verified by using the IEEE 33-bus network model and its performance and scalability are further assessed through a large-scale IEEE 300-bus network scenario. The numerical results confirm that the suggested cooperative control of multiple MGs can effectively promote the capability of secure power supply to CLs, and simultaneously improves the global utilization efficiency of DGs significantly, even without any energy storage in the network. © 2015 Elsevier Ltd.


Chen F.-Q.,Fuzhou University | Su F.,Fuzhou University | Su F.,Huadong Engineering Corporation | Shi Y.-Z.,Huaqiao University
Jisuan Lixue Xuebao/Chinese Journal of Computational Mechanics | Year: 2014

Problems of karst collapse may often occur in railway and highway construction. How to evaluate the influence of existed karst on adjacent tunnels reasonably is meaningful to design of tunnel engineering in karst regions. Considering a simplified cave as ellipse shape section and tunnel as circular, a simplified analysis solution for stresses and deformation characteristic of tunnel due to the influence of adjacent ellipse karst cave is proposed in the paper. Schwarz's alternating method was used to derive the formulas for calculating the stress and displacement of the surrounding rocks. Since the depth is larger than the size of the tunnel, the effect of gravity gradient is ignored, and gravity loads are simplified as uniform normal loads along far-field boundary. Comparison between the results from the closed solutions and those from numerical analysis by two-dimensional finite element method indicates that the closed solution is reliable and applicable for the stress and displacement field around circular tunnels adjacent to the influence of an ellipse karst cave at great depth.


Pan D.,Huadong Engineering Corporation Ltd. | Cheng Z.,Itasca Consulting Group Inc. | Lucarelli A.,Itasca Consulting Group Inc.
Geotechnical and Structural Engineering Congress 2016 - Proceedings of the Joint Geotechnical and Structural Engineering Congress 2016 | Year: 2016

The accurate estimation of the natural frequency of a turbine-pile-soil system is one of the key design requirements for an offshore wind farm. The natural frequency of the soil-structure interaction system must fall within a narrow window. A FLAC3D model is used to analyze an offshore wind turbine with a 6.5m diameter pile. Soils were modeled with solid zones using a Mohr-Coulomb model with strain-dependent moduli, the pile with linear elastic liner elements, and upper structure with beam elements. The interface between the pile and soil was also specified. The soil and interface parameters were carefully calibrated with advanced laboratory data including the small strain soil stiffness, and in-situ data from a pile test. Therefore, the numerical model could reproduce the test pile behaviors when subjected to both vertical and lateral static loads. The analysis suggests that both the soil strain-dependent modulus and the lumped rotational masses of the upper structure play significant roles in the turbine natural frequency analysis and should be particularly addressed during the design. © ASCE.


Pan D.,Huadong Engineering Corporation Ltd. | Lucarelli A.,Itasca Consulting Group Inc. | Cheng Z.,Itasca Consulting Group Inc.
Geotechnical and Structural Engineering Congress 2016 - Proceedings of the Joint Geotechnical and Structural Engineering Congress 2016 | Year: 2016

This paper describes field pile tests for offshore wind turbine foundations. Both vertical and horizontal pile load tests were carried out to investigate soil-pile interaction. Finite difference analyses, implementing a Mohr-Coulomb failure criteria with a non-linear elastic stiffness considering strain-compatible effects, were used to perform the back-Analysis. The results from numerical modelling are compared with the measured data obtained from optical fiber sensors installed on the internal steel pile surface. It was found that the pile-soil interaction is sensitive to the non-linearity of the soil. The non-linear soil stiffness provides a close match to the pile displacement (and consequently stress-resultants). In addition, the p-y curve method recommended by API was also used for back-Analysis. The results from the p-y curve method were found to overestimate the pile displacement and bending moment for large diameter piles in clay. © ASCE.


Liu F.,Ocean University of China | Li H.,Ocean University of China | Li W.,Huadong Engineering Corporation | Wang B.,Huadong Engineering Corporation
Renewable Energy | Year: 2014

An improved modal strain energy method is proposed for damage localisation in jacket-type offshore wind turbines by defining a series of stiffness-correction factors that can be employed to calculate the modal strain energy (MSE) of the measured model without utilising the stiffness matrix of the finite element model (FEM) as an approximation. The theoretical contribution of this article is that the MSE of the measured model could be estimated with better accuracy, and the advantage of the proposed indicator is that it is more sensitive to damage locations than the traditional MSE method. Numerical studies on a tripod offshore jacket wind turbine reveal that the proposed method could locate the damage positions for jacket-type offshore wind turbines when limited number of lower-order modes is available, even when these modes are spatially incomplete. The performance of the proposed method is also investigated using real measurements from a steel jacket-type offshore wind turbine experiment conducted in a water tank of Ocean University of China. The experimental results demonstrated that the proposed method outperforms the traditional MSE method, and damages in jacket-type offshore wind turbines could be properly located utilising the first two measured modes excited by environmental loadings, such as waves, currents, or the vibration of the wind turbine. © 2014 Elsevier Ltd.


Wang A.-L.,Huadong Engineering Corporation Ltd | Wang Y.-J.,Huadong Engineering Corporation Ltd | Lei X.-Y.,Huadong Engineering Corporation Ltd
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2016

A pumped-storage power station has high filling of the upper reservior bottom 120 metres in thickness, and the settlement deformation and local uneven deformation are obvious after water storage. HDPE geomenmbrane is used to get better adaption of the defomation of the reservior bottom to ensure the seepage prevention function. In additon, 3D finite element method is taken to analyze the above problems. For the are as with large local tension strain, engineering measures such as increasing modulus region are adopted. It may provide reference for similar projects. © 2016, Chinese Society of Civil Engineering. All right reserved.

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