Entity

Time filter

Source Type


Wang X.-J.,East China Architecture Design & Research Institute Co.
Yantu Lixue/Rock and Soil Mechanics | Year: 2015

The bearing capacity of rock-socketed pile is usually large, and it is difficult and expensive to obtained to the ultimate state on the field tests. The data obtained from the field tests are hard to reflect the bearing capacity and deformation of the rock-socketed pile. Based on the data of field tests at Wuhan Lvdi Center, ABAQUS finite element method is used to analyze the bearing capacity and deformation of the rock-socketed pile, which including the property of rock, depth-diameter ratio of the rock-socketed pile, and the upper soil covering. The numerical analysis shows that based on the reasonable constitute model, and the reasonable parameter value, the calculation results of FEM is consistent to the field measurements. The numerical analysis shows that, the above mentioned influencing factors are all important to the rock-socketed piles. The rock property and the depth-diameter ratio of socketed pile has little influence on the side friction of the upper soil covering. Bearing capacity of rock-socketed part is the main components of the bearing capacity of the whole pile; while to the pile with deep upper soil, the side friction of upper soil covering is a very important part of the bearing capacity of rock-socketed pile. ©, 2015, Academia Sinica. All right reserved. Source


Weng Q.,Tongji University | Weng Q.,East China Architecture Design & Research Institute Co.
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2015

The Wuxi Railway Station Traffic Hub is a complex building including a high-speed railway station, a metro station and bus stations. The excavation of this project is extremely large and the surrounding environment is quite complex. Moreover, some parts of the building have urgent time requirement. The foundation pit was divided into several parts and different retaining system was adopted for different parts. In addition, Some new techniques are applied such as Finite-span structure used as temporary support, Large-diameter retrievable anchor and cover and cut method. The design scheme and new techniques fulfilled the economy, time and environment protection requirements of the project. ©, 2015, Editorial Office of China Civil Engineering Journal. All right reserved. Source


Wang X.-J.,East China Architecture Design & Research Institute Co.
Yantu Lixue/Rock and Soil Mechanics | Year: 2015

Full-scale static load tests of four sets of uplift piles with side-grouted are carried out in the project of Shanghai Hongqiao Comprehensive Transportation Hub. Curves of side resistance and relative displacement relationship (τ-w curve) of all soil layers in the pile range are derived based on the measured data. Firstly, make every soil layer τ-w curves of the full-scale test and the τ-w curves from the direct shear test normalized, in which the normalized parameters are the ultimate side resistance and the corresponding critical relative displacement of pile and soil. Secondary, a hyperbolic function is used to fit the normalized data; and then a unified τ/τult-w/wult function curve is obtained. Finally, the unified fitted curve is applied into load-transfer method, and the pile head load-displacement relation, pile axial force and side friction distribution curve along the pile depth under different test load levels are gotten easily, so as to use it to predict bearing capacity and deformation properties. It is meaningful in the theoretical analysis and practical engineering. ©, 2015, Academia Sinica. All right reserved. Source


Wang W.,Tongji University | Wang W.,East China Architecture Design & Research Institute Co. | Wang A.,Tongji University | Wu J.,East China Architecture Design & Research Institute Co. | Huang Y.,East China Architecture Design & Research Institute Co.
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2016

Poulos elastic theory method based on the Mindlin solution in elastic half-space is suitable to study the settlement of the pile group by using superposition principle. This method may not be sufficiently accuracy when applied to large pile groups. The ignored but important pile group reinforcing effect was then supported by the proposed three-pile model in this paper. In order to improve the computation efficiency of this pile group reinforcing effect, reinforcement coefficient was proposed based on Poulos two-pile analysis. And then, the matrix expression of pile group reinforcement coefficient was derived and the pile group reinforcement coefficient method considering `sheltering-pile group reinforcing effect' was proposed finally. The relative example analysis shows that the proposed method agrees with the Poulos interaction factor method and the Butterfield's boundary element method (BEM) for the settlement of small pile group. Calculation of the pile foundation of the Shanghai Center Tower indicates that the proposed method is more accurate than the Poulos interaction factor method. © 2016, Editorial Office of Journal of Building Structures. All right reserved. Source


Wang W.-D.,East China Architecture Design & Research Institute Co. | Wu J.-B.,East China Architecture Design & Research Institute Co. | Wang X.-J.,East China Architecture Design & Research Institute Co.
Yantu Lixue/Rock and Soil Mechanics | Year: 2015

For the current technical code for building pile foundations(JGJ94-2008), the comprehensive coefficients of shaft/tip resistance for rock socketed pile are used to calculate the bearing capacity of the rock-socketed part. The method is easily to be used and is meaningful for the engineering application, while the values of the comprehensive coefficient are not very reasonable. Based on the data about 20 pile tests of 4 background projects, the FEM is used to calculate the comprehensive coefficient for rock socketed pile. And a value table are presented, which is more detail than the standard table; in which the relationship among comprehensive coefficient, rock property and depth-diameter ratio of rock-socketed pile is given. It is shown that the calculation results of using the comprehensive coefficient proposed herein is more closer to the measured value than the calculation results of using the comprehensive coefficient of the current code. ©, 2015, Academia Sinica. All right reserved. Source

Discover hidden collaborations