East China Architecture Design & Research Institute Co.

Shanghai, China

East China Architecture Design & Research Institute Co.

Shanghai, China
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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.


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.


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.


Wang W.,East China Architecture Design & Research Institute Co. | Wu J.,East China Architecture Design & Research Institute Co. | Nie S.,East China Architecture Design & Research Institute Co.
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2016

Wuhan Center Tower is 438 m high with the average pressure of 1 000 kPa on the bottom of foundation. Test piles with a diameter of 1 000 mm and a length of about 64.0-68.0 m were applied to field full scale test. A series of pile load tests have been carried out on four bored piles socketed in slightly decomposed mud rock. Both axial load and displacements of the pile were monitored in the course of the test. The results show that the load-deformation curves of the piles STZ1, STZ2 and STZ2A are gradual and the load-deformation curve of the pile STZ1A is sharply dropping form due to pile-end sediment. The pile top settlements are 25.14-33.7 mm. The pile tip settlements are 0.8-3.2 mm. Pile compression occupies more than 90% of pile top settlement, showing the characteristics of super long pile. Side friction distribution and bearing characteristics of super-long rock-socketed piles are different from those of super-long non-rock-socketed piles. The tip resistance ratio of four piles are 19.8%-28.1%. The measured base resistance of the socketed pile is larger than the uniaxial compressive strength of the soft rock. The bearing capacity of the pile predicted using the equation recommend in the `Technical code for building pile foundation' (JGJ 94-2008) is underestimated. The results of the field pile load tests provide bases for the design of super-long soft rock socked piles in the project. The tests also yield valuable data for practical application and theoretic investigation of super-long soft socketed piles in Wuhan. © 2016, Editorial Office of Journal of Building Structures. All right reserved.


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 Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2016

A series of ultimate loading tests on two types of uplift piles with an enlarged base with effective pile lengths of 19 m and 30 m are carried out. For each type, three test piles are loaded to failure. The deformations of the test piles at the top and toe are continuously monitored throughout the tests. For the 19 m-long piles, the axial force of pile shaft is measured as well. Load-displacement curves, distribution of axial force of pile shaft and shaft resistance are investigated. The monitoring data and numerical analysis results show that the uplift capacity of uplift piles with an enlarged base is composed of shaft resistance of the uniform section and uplift resistance of the under-reamed part. When a pile is pulled up, the shaft resistance of the uniform section works firstly, subsequently followed by the uplift resistance of the under-reamed part. At the ultimate state, the uplift resistance provided by the under-reamed part accounts for about 50% and 35% of the total uplift capacity for the 19 m-long and 35 m-long piles. It is also found that the influence of the under-reamed base on the development of shaft resistance is not significant. The uplift resistance of the under-reamed base mainly comes from the vertical component of the normal force of the soil around the base, which takes a proportion of approximately 70% at the ultimate state. © 2016, Editorial Office of Chinese Journal of Geotechnical Engineering. All right reserved.


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.


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.

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