MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering

Hangzhou, China

MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering

Hangzhou, China

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Chen R.-P.,Zhejiang University | Chen R.-P.,MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering | Wang Y.-W.,Zhejiang University | Wang Y.-W.,Ningbo Construction Co. | And 4 more authors.
Tiedao Xuebao/Journal of the China Railway Society | Year: 2015

Through a full scale model test on pile-supported reinforced embankment, by exerting 1.2 m times dynamic axle load to the embankment under the condition of a train moving at a speed of 324 km/h, this paper studied the variation of dynamic soil stress with vibration times at the level of pile caps and in the 3.2 m embankment range. The development of the soil arch under long-term dynamic load was analyzed as well. The experiment results showed that when the pile-soil differential settlement was relatively large, the pile caps sustained nearly 90 percent of static load and dynamic load. As the soil arch strengthened the transmission of the dynamic stress in the embankment to the pile cap, the Boussinesq equation was not applicable to the calculation of distribution of dynamic stress in the embankment. Under long-term dynamic loads, the dynamic pile-soil stress ratio decreased, but the decrease was slight, indicating minor degeneration of the soil arch. ©, 2015, Science Press. All right reserved.


Cai Y.-Q.,MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering | Cai Y.-Q.,Wenzhou University | Wang P.,MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering | Cao Z.-G.,MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2011

A semi-analytical approach is used to study the torsional vibration of a rigid circular foundation resting on poroelastic half-space subjected to obliquely incident SH waves. The Biot's dynamic poroelastic theory is employed to characterize the saturated half-space. The governing equations for the saturated half-space and foundation are solved by using the Hankel transform. The total wave field in the saturated half-space is classified into free-field waves, rigid-body scattering waves and radiation scattering waves. According to the classification of the total wave field and the mixed boundary-value condition between the saturated half-space and foundation, the torsional vibration of the foundation is formulated into two sets of dual integral equations. Then, the integral equations are reduced to Fredholm integral equations of the second kind to solve. Considering the dynamic equilibrium equation of the foundation, the torsional vibration expression of the foundation is obtained. Numerical results are presented to demonstrate the effects of wave frequency, incident angle of the waves, the torsional inertia moment of the foundation and permeability of the saturated half-space on the torsional vibration.


Ying H.,Zhejiang University | Ying H.,MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering | Zhang L.,Zhejiang University | Zhang L.,MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering | And 4 more authors.
Mathematical Problems in Engineering | Year: 2015

Analytical solutions are developed for one-dimensional consolidation of double-layered saturated soil subjected to groundwater fluctuations. The solutions are derived by an explicit mathematical procedure using Duhamel's theorem in conjunction with a Fourier series, when groundwater fluctuation is described by a general time-dependent function and assumed to be the pore water pressure variations at the upper boundary. Taking as an example the harmonic groundwater fluctuation, the relevant response of the excess pore water pressure is discussed in detail, and the main influencing factors of the excess pore pressure distribution are analyzed. A dimensionless parameter θ has been introduced because it significantly affects the phase and the amplitude of excess pore pressures. The influences of the coefficients of permeability and compressibility of soil on the excess pore pressure distribution are different and cannot be incorporated into the coefficient of consolidation in double-layered soil. The relative permeability ratio of two clayey soils also plays an important role on the curves of the distributions of the excess pore pressures. The effects of the thickness of the soil layer on the excess pore pressure distribution should be considered together with the dimensionless parameter θ and the permeability and compressibility of the double-layered soil system. © 2015 Hongwei Ying et al.


He W.,MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering | He W.,Zhejiang University | He W.,Changsha University of Science and Technology | Chen R.-P.,MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering | And 5 more authors.
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2010

The pile groups with complex structure or constructed in complex circumstances will be subjected to torque. It is of significance to study their bearing behaviors and to establish relevant calculation theory. According to the characteristic of rotation and load distribution in pile groups subjected to torque, an equation for determining the horizontal load and torque on each pile in the groups is established based on the force equilibrium conditions, and a method for determining twist center location of pile groups with asymmetrically horizontal rigidity distribution of piles is proposed. The coupling effect between piles and loads are analyzed based on recent researches. The method to calculate angle of twist of caps and loads distributed over each pile is obtained by introducing the p-y curve method and the torsion rigidity theory of a single pile. The relevant codes are programmed, and also employed to analyze centrifuge tests on a pile group, and the computed results are compared with the experimental results. The agreement is good. Finally, location offset of twist center of pile cap with asymmetrically horizontal rigidity distribution is analyzed, and some beneficial insights are provided.


Chen R.P.,Zhejiang University | Chen R.P.,MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering | Zhao X.,Zhejiang University | Zhao X.,MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering | And 4 more authors.
Recent Advances in Environmental Vibration - Proceedings of 6th International Symposium on Environmental Vibration, ISEV 2013 | Year: 2013

The dynamic soil pressure of the subgrade and the velocity of the slab characterize the dynamic interaction of track structure-subgrade. The dynamic soil pressure and the velocity of slab are strongly influenced by repeated wheel loads and train speed. Full-scale model test is the most efficient way for studying the subgrade's dynamic behavior. This paper introduces the full-scale model test conducted at Zhftiang University. The development of velocity and dynamic soil pressure under different train speed and repeated wheel loading were presented when the water level is on the subgrade surface.


Zhang Z.-M.,MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering | Wang Z.-J.,MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering
2010 International Conference on Mechanic Automation and Control Engineering, MACE2010 | Year: 2010

Based on the statistical analysis of results from the static load tests of about 200 bored piles rested on the middle-weathered bedrock in Zhejiang province, the measured compression of pile shaft was analyzed using the elastic theory, and then a simplified method for calculating the pile shaft compression was presented including a pile shaft compression factor, ξ. Moreover, statistical results show that, for the pile embedded into a middle-weathered bedrock, the percentage of the settlement at pile head caused by the pile shaft compression is about 80∼95%. In addition, a simplified method for calculating the pile top settlement was given, taking advantage of the pile shaft compression factor and the ratio of the pile shaft compression to the pile top settlement. It can be concluded that, the present calculating method can consider the influence of the plastic pile shaft compression on the settlement at pile top, due to that all the parameters of the present method are derived from the statistical results of the static load tests. ©2010 IEEE.

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