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Wu C.-J.,Shanghai JiaoTong University | Chen J.-J.,Shanghai JiaoTong University | Ye G.-L.,Shanghai JiaoTong University | Wang J.-H.,Shanghai JiaoTong University | Zhou H.-B.,Shanghai Jianke Project Management Co.
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2010

The current studies on foundation pits are reviewed. Compared with those in Shanghai, the hydro-geological conditions in Suzhou are analyzed. The excavation faces are located on (5)3 with poor geological conditions. The measured data of a typical foundation pit indicate that the average maximum displacement of the building envelope by use of diaphragm walls or secant piles is about 0.16%H, and the average settlement of ground is 0.13%H. Three-dimensional numerical analysis is employed to simulate the process of the excavation of the representative station, Suzhou Leyuan Subway Station. It is found that the displacement of the toe of diaphragm walls is relatively large. The conclusions from the construction of the Subway Line One of Suzhou will be contributing to the future construction of subway stations in Suzhou.

Huang M.,Hefei University of Technology | Liu J.,Shanghai JiaoTong University | Wang N.,Shanghai Jianke Project Management Co.
2010 International Conference on Mechanic Automation and Control Engineering, MACE2010 | Year: 2010

To know deep foundation pit state and ensure its safety, multi monitoring points data are used to establish model in a quick and useful way. Considering grading excavation effect, time effect and synchronous multi-point displacement monitoring information, the frame of Radial basis function artificial neural network (RBF) multi-point monitoring model has been structured. The concise effect factors base on Genetic Creep Theory are studied to forecast multi-point displacement. After analyzing the action of RBF centers in this network, preselected centers considering the grading excavation and curve characteristic of displacement have been used in calculation. Monitoring data from a deep foundation pit are used to establish multi-point model base on the multi-point model frame, concise effect factors and preselected centers. Analyses show that the results of instance are very good. Application suggestions are also presented combining RBF characteristics and monitoring practice. ©2010 IEEE.

Liu W.-L.,Shanghai Shentong Metro Co. | Ju L.-Y.,Shanghai Shentong Metro Co. | Gao W.-J.,Shanghai Jianke Project Management Co.
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2010

Taking into account the difficulty of quantitative risk assessment of underground engineering because of the uncertainty, the semi-quantitative risk assessment method is proposed based on engineering application and risk management experience of foundation pit in soft soil. The method contains two steps. Firstly, risk assessment criterion has been built; Secondly, risk levels is obtained to compare the engineering information with the risk assessment criterion. The criterion is formed mainly by endue corresponding risk levels to different categories combinations of properties, after classifying the criteria about general and individual procedures of foundation project. The classifying criteria is based on the detailed analysis of four aspects of risk factors: engineering characteristics, geological and hydrological conditions, surrounding environment and construction technology. Eventually, this method is verified to be simple and worth spreading by engineering practice.

Zhang Z.-M.,Zhejiang University | He J.-Y.,Zhejiang University | Zhang Q.-Q.,Zhejiang University | Zeng L.-C.,Shanghai Jianke Project Management Co.
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2010

The data based on the static load tests and settlement observations show that the compression of the piles accounts for a considerable part of the total settlement of the piles under the working loads. Simultaneously, the side resistance of the piles takes a large part while the end resistance of the piles takes a small one. The ultimate pile-soil relative displacement of 17~20 mm is needed for the super-long piles to bring their side resistance into full play at the upper half of the piles in the clay. After that, the soil slides and the friction is degraded. The settlement of pile-group foundation increases as the load becomes larger and larger. The rules are as follows: the main building and the podium settle down simultaneously at low floors (below the 5th floor); then the main building continues its settlement and has a 'settling promotion effect' to the completed podium with taller floors (above the 30th floor); after the 30th floor, the podium shows upwarping because of the 'pulling up effect' due to the large relative settlement of the tube of the main building's, while the total settlement is small, so the differential settlement in the edge points and surrounding points of the main building, podium and tube is not obvious. And the settlement ratio of the pile groups first increases and then decreases with the increase of loads.

Li J.-J.,Tongji University | Li J.-J.,Shanghai Jianke Project Management Co. | Huang M.-S.,Tongji University | Wang W.-D.,East China Architectural Design and Research Institute | Chen Z.,East China Electric Power Design Institute
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2010

Determination of the ultimate bearing capacity of an uplift pile under deep excavation has been paid much attention to by more and more geotechnical engineers. The theoretical analysis of this problem becomes a hot research topic recently. Unfortunately, due to the limitation of in-situ test conditions, it is almost impossible to obtain the ultimate uplift capacity of tension piles under deep excavation from field tests. Accordingly, centrifuge model tests on uplift piles under deep excavation are performed to examine the load transfer characters and the ultimate bearing capacity. The variation of displacement, friction resistance and internal axial force of the uplift piles before and after deep excavation is analyzed. And then the centrifugal model tests results are used to verify the rationality of the FEM and the limit equilibrium method. The calculated results by the two theoretical methods have good agreement with the results of centrifugal model tests.

Sun H.,Shanghai Jianke Project Management Co. | Sun H.,Tongji University | Pan Y.,Shanghai Construction Safety and Quality Supervision Terminal | Zhou H.,Shanghai Jianke Project Management Co. | Huang M.,Tongji University
Geomechanics and Geotechnics: From Micro to Macro - Proceedings of the International Symposium on Geomechanics and Geotechnics: From Micro to Macro, IS-Shanghai 2010 | Year: 2011

The influence of particle breakage on hardening rule and dilatancy is studied here, thus the modified equations are proposed respectively. When the breakage energy is introduced into the hardening rule and dilatancy of coarse granular aggregates, a new elasto-plastic constitutive model is herein developed for considering particle breakage, which is based on the concept of effective plastic work. The numerical simulations for various confining pressure tests are performed in a developed program with the proposed model and the model without considering particle breakage. It is shown that the proposed model can accurately describe the strength and deformation of coarse granular aggregates subjected to low and relative high confining pressure, In addition, particle breakage could decrease the shear strength, and increases the compression deformation. © 2011 Taylor & Francis Group.

Xie X.,Tongji University | Yang Y.,Tongji University | Ji M.,Shanghai Jianke Project Management Co.
Tunnelling and Underground Space Technology | Year: 2016

There is an ever-growing demand of construction of large-diameter tunnel in Shanghai, China. How to minimize the environmental impact induced by the tunnel construction has been a hot topic of research over the recent years. The Yingbin San Road tunnel with an external diameter of 13.95m has been taken as an example to elaborate the controlling of ground surface deformation induced by shield-driven tunneling, in the case of tunnel passing through the settlement sensitive area and adverse geological conditions. Tunneling process of the EPB shield machine was simulated using a three-dimensional finite difference method. Parametric study was performed to optimize the construction parameters. Field measurement was also carried out to validate the numerical model and its applicability in the case of large-diameter tunnels. Both the numerical prediction and field test data show that grouting pressure and quality appear to determine the surface settlement rather than the supporting pressure at workface on the premise of guaranteeing the safety of tunneling process. Both the empirical correlations and field observations demonstrate that the volume loss Vi should be controlled below 0.2% to guarantee the maximum surface settlement no more than 10mm in the airport area. However, the empirical predictions of trough width parameter i do not match the field measurement very well except for the case where such a high volume loss as 0.81% was obtained. © 2015 Elsevier Ltd.

Chen X.,Tongji University | Chen X.,Shanghai Jianke Project Management Co. | Wang Y.,Shanghai Jianke Project Management Co.
Communications in Computer and Information Science | Year: 2011

The construction industry plays a decisive role in the development of national economy, which runs unique characteristics. IT Governance is built based on COBIT model in this paper to promote the progress of construction information smoothly. © 2011 Springer-Verlag Berlin Heidelberg.

Zhou H.-B.,Shanghai Jianke Project Management Co | Zhang H.,Shanghai Jianke Project Management Co
Geotechnical Special Publication | Year: 2010

Risk assessment and risk management of large projects are essential for the quality and safety of civil engineering. A dynamic risk management system for large construction projects in China is proposed. The dynamic risk management system is composed of six main parts, which are event database, risk database, risk identification, risk assessment, risk pre-control, and risk tracking. The results of risk assessment can promote reasonable decision-making for risk tracking. The risk tracking is an essential part of risk management, which contains a process of site risk exploration, risk re-identification, risk treatment and formation of risk tracking report. By using the risk management system in large project construction, the key risk events we caring about are monitored and new risk events may be found. Then the new risk event will be assessed and the decision will be made whether monitoring or not. Through the dynamic risk management system, we can clearly know the real-time statement and developing trend of every risk events, and then can take some precaution and control measures to treat the risk events for the purpose of preventing the occurrence of risk events or reducing the risk to an acceptable level. © 2010 ASCE.

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