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Cui Z.,CAS Wuhan Institute of Rock and Soil Mechanics | Cui Z.,Power China Huadong Engineering Corporation Ltd | Sheng Q.,CAS Wuhan Institute of Rock and Soil Mechanics | Leng X.,CAS Wuhan Institute of Rock and Soil Mechanics
Rock Mechanics and Rock Engineering | Year: 2016

Seismic wave propagation through joints that are embedded in a rock mass is a critical issue for aseismic issues of underground rock engineering. Few studies have investigated nonlinear joints with a continuously yielding model. In this paper, a time-domain recursive method (TDRM) for an S wave across a nonlinear Mohr–Coulomb (MC) slip model is extended to a continuously yielding (CY) model. Verification of the TDRM-based results is conducted by comparison with the simulated results via a built-in model of 3DEC code. Using parametric studies, the effect of normal stress level, amplitude of incident wave, initial joint shear stiffness, and joint spacing is discussed and interpreted for engineering applications because a proper in situ stress level (overburden depth) and acceptable quality of surrounding rock mass are beneficial for seismic stability issues of underground rock excavation. Comparison between the results from the MC model and the CY model is presented both for an idealized impulse excitation and a real ground motion record. Compared with the MC model, complex joint behaviors, such as tangential stiffness degradation, normal stress dependence, and the hysteresis effect, that occurred in the wave propagation can be described with the CY model. The MC model seems to underestimate the joint shear displacement in a high normal stress state and in a real ground motion excitation case. © 2016 Springer-Verlag Wien


Cui Z.,CAS Wuhan Institute of Rock and Soil Mechanics | Cui Z.,PowerChina Huadong Engineering Corporation Ltd | Sheng Q.,CAS Wuhan Institute of Rock and Soil Mechanics | Leng X.,CAS Wuhan Institute of Rock and Soil Mechanics
Rock Mechanics and Rock Engineering | Year: 2016

In this paper, the seismic stability of the #1 surge chamber of the Baihetan hydropower plant, which is influenced by a large dominating geological discontinuity [the interlayer shear weakness zone (ISWZ) C2)], is studied. An advanced, nonlinear, continuously yielding (CY) model was adopted to describe the complex mechanical properties of ISWZ C2. This model considers a power function type, normal stress dependent behavior and the progressive damage that occurred during shear tests. The applicability of the CY model is proved via a comparison with field test results and the theoretical solution. Verification work was conducted in 3DEC code to show that the 3DEC software is suitable for implementing this model. Three ground motion waveforms were utilized to conduct a seismic analysis of the #1 surge chamber after a special response spectrum matching process. The seismic analysis confirmed the control effect of ISWZ C2 on the seismic stability of the cavern. The majority of the cavern’s seismic displacement consists of elastic body movement, while the plastic deformation is relatively limited. Further, most of the deformations were caused by the contact deformation of C2. For the contact deformation of C2, the magnitude of permanent shear deformation is larger than that of the normal deformation. The magnitude of permanent shear deformation is more notable along the strike direction of C2, and the permanent normal displacement n of C2 mainly occurs along the dip direction of C2. Finally, the seismic stability of the cavern is assessed via the overload method. The seismic safety factor of the cavern is approximately 2–3. © 2016 Springer-Verlag Wien


Zhang C.,PowerChina Huadong Engineering Corporation | Chu W.,HydroChina R and nter | Hou J.,PowerChina Huadong Engineering Corporation | Chen X.,PowerChina Huadong Engineering Corporation | And 2 more authors.
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2014

The large scale in-situ test is an important method to solve complex engineering problems. During the construction of diversion tunnels at Jinping II hydropower station, an in-situ test program to monitor the realtime response of the surrounding rocks of the diversion tunnel excavated with TBM was designed and implemented. The contents of the in-situ test program include the stress measurement of rock mass with the rock stress meters of vibrating wire and CSIRO HI Cells to record the stress change in rock mass during tunneling, the acoustic emission monitoring to detect the crack initiation and propagation in rock mass during excavation, the sonic velocity measurement to determine the profile of excavation damage zone around tunnel, the displacement measurement with the multipoint displacement meters and fiber Bragg grating sensors to obtain the deformation of rock mass during tunneling, the digital photographing of borehole to observe the process of the macrocrack initiation. This article is the first of the series and introduce the background of the project, the designing of the in-situ test program, and the detailed geological models of the tested region.


He Q.,Power China Huadong Engineering Corporation Ltd
Taiyangneng Xuebao/Acta Energiae Solaris Sinica | Year: 2016

Three kinds of data length and three kinds of tidal current energy resources assessment methods are compared and analyzed using the observation data of Daishan in Hangzhou bay. The calculation results showed that the method of calculated directly by taking average is most accurate, but need stricter data length and resolution requirements. Velocity grading distribution calculation method applicable to a wider range of data interval is not required strictly, and the data reflect the full length of the long tidal cycle trend can also be. The precision of spring and neap maximum velocity assessment method is lowest due to many approximations are used. Data length of one month is a basic requirement, more than one month is better, a tidal cycle(including spring medium and neap tide) data can also be used, but only spring and neap tidal maximum current speed data is generally not recommended. © 2016, Editorial Board of Acta Energiae Solaris Sinica. All right reserved.


Fu J.,Central South University | Yang J.,Central South University | Zhu S.,Power China Huadong Engineering Corporation Ltd
Geotechnical Special Publication | Year: 2016

Technical measures, such as underground partition wall, could sever as recourse to mitigate the ground movements induced by excavation. In this paper field monitoring and numerical analysis were used to examine the performance of underground jet-grouted partition wall in mitigating the effects of shield tunnel construction on existing pier of Xin-Zhong Road viaduct in the project of Changsha Subway Line 1 in China. The performance of the jet-grouted partition wall was calibrated by the reasonable agreement found between the observed field measurements and the numerical results. Underground jet-grouted-column partition wall was testified to serve as an effective measure in ground movement control given the need of tunnelling nearby piled structures. © ASCE.


Chen W.,PowerChina Huadong Engineering Corporation Ltd | Huang H.,PowerChina Huadong Engineering Corporation Ltd | Ma P.,PowerChina Huadong Engineering Corporation Ltd
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2015

The maximum burial depth of rock mass is about 2500 m in Jinping II hydropower station diversion line, deformation test is carried out for studying the deep rock mechanical property under the pressure of 100 MPa. The rigid bearing plate for center-hole method is employed, deformation property of deep rock mass is analyzed under the ultra-high pressure, these are relationship between deformation modulus and the burial depth, anisotropic feature, the deformation feature while the test pressure is greater and less than the initial geostress. (1) Rock mass deformation modulus is related to the burial depth, deformation modulus is remarkably improved with the increase of depth. (2) Anisotropic feature is manifested in different burial depth. (3) The rock mass is carrying on rebound test when the test pressure is less than the initial geostress, the ratio of elastic deformation to total deformation is relatively larger, elastic deformation is less when the test pressure is larger than the initial geostress. (4) The compression deformation in the depth of 0.5-1.0 m is the maximal, and the degree of damage of rock mass is more serious. Research results provide the basis for the further study of rock mass deformation property and stability analysis of deep underground cavern. ©, 2015, Academia Sinica. All right reserved.


Mei T.,Zhejiang University | Tang Y.,Power China Huadong Engineering Corporation Ltd | Gan D.,Zhejiang University
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2016

Equity is one of the foremost considerations in free allocation of power system carbon emission, while the impact of historical deficits is one of the key essentials in fair distribution. Based on Shapley values, a historical deficit sharing model capable of solving the allocation problem of historical deficits in the emission reduction year is established and axiomatized. In accordance with the principle that whoever causes the issue should be responsible for it, a historical emission deficit sharing model among the units is developed, which is capable of solving the reduction of unit's claims caused by historical deficits. On this basis, with the consistency constraint of the allocation method taken into account, an allocation model for initial emission allowances considering the historical emission deficit is established. Furthermore, the participants' gaming behaviors under the aggregation mechanism are studied, which proved the existence of game equilibrium. In the meantime, the properties of the historical emission deficits sharing model such as anonymity, efficiency and independence of irrelevant share are proved, and the fair ranking is discussed. In the end, it is proved by a case study that as the proposed method meets the basic requirements for fair allocation, it can be easily accepted by the participants. © 2016 Automation of Electric Power Systems Press.


Zhao S.,University of Management and Economics | Huang B.,Power China Huadong Engineering Corporation | Guo B.,University of Management and Economics
Communications in Computer and Information Science | Year: 2016

In order to study the effect of dredging project on water supply safety of the reservoir, a case study of Duihekou reservoir is taken in this paper. On the basis of the characteristics of water environment, sediment and the surrounding pollution, analyze of the related activities of the project, predict the influence of the water head site dredging project on water environment, especially water intake and scenic area. The results show that chain bucket dredger only has a certain impact on the dredging area and nearby, the overall impact on the water quality of the reservoir is small, and the dredging project does not affect the water intake basically. Disturbance effect of wetland type dredging dredger is similar to chain bucket dredger. © Springer-Verlag Berlin Heidelberg 2016.


Zhao S.,University of Management and Economics | Huang B.,Power China Huadong Engineering Corporation | Guo B.,University of Management and Economics
Communications in Computer and Information Science | Year: 2016

To know whether the water reservoir dredging engineering affect the water source reservoir, Duihekou reservoir is taken as an example in this paper, and a test engineering of dredging at the end of the reservoir is done. First introduced the general situation of reservoir and the test dredging engineering, and combined with the characteristics of reservoir sediment, and onsite monitoring data, the impacts of water quality on the dredging operation of the reservoir, water intake and the test dredging work area were investigated and analyzed. Comprehensive routine monitoring data and special monitoring data, test dredging engineering did not have a significant impact on the water quality of Duihekou reservoir. The water quality of water intake and the test area was not significantly changed. And the upstream tended to improve, through precipitation and water purification treatment. © Springer-Verlag Berlin Heidelberg 2016.


Patent
POWERCHINA HUADONG ENGINEERING CORPORATION Ltd | Date: 2015-03-07

Disclosed is a wind turbine generator foundation with pressure-dispersive pre-stressed anchor rods or anchor ropes. The foundation comprises a pile cap, a plurality of foundation piles arranged circumferentially at the bottom of the pile cap at uniform spacing, and a wind turbine generator tower connected to an upper part of the pile cap.

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