Chongqing Key Laboratory of Geomechanics and Geoenvironment Protection

Chongqing, China

Chongqing Key Laboratory of Geomechanics and Geoenvironment Protection

Chongqing, China
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Lai J.,PLA Logistical Engineering University | Zheng Y.,PLA Logistical Engineering University | Zheng Y.,Chongqing Key Laboratory of Geomechanics and Geoenvironment Protection | Liu Y.,Chongqing Industry Polytechnic College | And 4 more authors.
Electronic Journal of Geotechnical Engineering | Year: 2014

In recent years, the crust seemed to active frequently and the earthquakes never interrupt, which proposed higher requirement to slope support design. Embedded anti-slide pile as a new support form has got a lot of use in China. Restricted by engineering practice under earthquake action and the lack of seismic test data, the seismic design of this pile type often adopt static method, this method cannot be well to consider the structure-soil dynamic effects, so there is a big security risk. In this paper, the seismic behavior of anti-slide pile subjected to seismic loads was analyzed by using large-scale shaking table test. The acceleration response of slope, displacement and dynamic stress distribution of pile were studied by inputting bidirectional Wenchuan wave (China, 2008) and increasing the amplitude of the seismic waves. Test research provided a basis for seismic design of embedded anti-slide pile. © 2014 ejge.


Lai J.,PLA Logistical Engineering University | Lai J.,Chongqing Key Laboratory of Geomechanics and Geoenvironment Protection | Zheng Y.-R.,PLA Logistical Engineering University | Liu Y.,Chongqing Industry Polytechnic College | And 2 more authors.
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2014

A large shaking table test is performed to study the seismic performance of a slope with double-row anti-slide piles triggered by seismic load. Different dynamic response characteristics and failure mechanisms are studied by comparing the failure processes of a pile-anchor mixed support system and a single pile support system. The tests show that shear failure first occurs at the slope toe under a pile-anchor mixed support. As the horizontal acceleration increases, tension crack starts to develop at the top of the slope. The overall failure of the slope occurs when a global failure surface is formed, connecting the shear failure at the toe and tension crack at the top. However, tension cracks first appear at the slope top under the single pile support conditions. These cracks extend towards the slope toe as the acceleration increases and eventually lead to the overall slope failure. The experimental observations and data demonstrate that the seismic performance of the former is better than that of the latter. The slope failure is the result of the combined effect of tension and shear. This experimental study has laid a solid foundation for the seismic design of anti-slide piles.


Bo Y.,PLA Logistical Engineering University | Yingren Z.,PLA Logistical Engineering University | Yingren Z.,Chongqing Key Laboratory of Geomechanics and Geoenvironment Protection | Jie L.,PLA Logistical Engineering University | And 2 more authors.
Open Civil Engineering Journal | Year: 2015

To reveal the response and damage mechanism of a tunnel across through the fracture zone under earthquake, a shaking table model test and numerical analysis were introduced, where the scale of the numerical simulation and the model test was 1:1. The tunnel acceleration response and the crack, development process, strain response characteristics and dynamic stress distribution of lining were investigated. The results show that the tunnel lining will be subjected to large tension and compressive stress, when its tensile strength is insufficient, tension fracture would generate in the bottom of the arch or near both sides of the arch foot , so reinforced concrete lining should be adopted in order to improve its ability to bear the tensile failure; the acceleration response of lining increases with the increase of input seismic acceleration; dynamic earth pressure response is more intense on both sides of the surrounding rock. This research can serve as a reference for the seismic design of the tunnel. © Bo et al.; Licensee Bentham Open.


Lai J.,PLA Logistical Engineering University | Lai J.,Chongqing Key Laboratory of Geomechanics and Geoenvironment Protection | Zheng Y.,PLA Logistical Engineering University | Liu Y.,Chongqing Industry Polytechnic College | And 4 more authors.
Electronic Journal of Geotechnical Engineering | Year: 2015

Landslide thrust is too large and the bearing capacity of a single anti-slide pile is difficult to meet this requirement, multiple anti-slide piles are chosen to solve this problem. However, due to the complexity of multiple anti-slide piles, the related studies of the dynamic response of this structure are few, which is difficult to meet the requirements of the current seismic stability analysis. In this paper a new method of dynamic stability analysis is presented. The strength reduction dynamics analysis method was introduced into the slope dynamic stability analysis. Through the analysis of a practical engineering, this method was demonstrated feasibility. The method provides a new train of thought. © 2015 ejge.


Bo Y.,PLA Logistical Engineering University | Yingren Z.,PLA Logistical Engineering University | Yingren Z.,Chongqing Key Laboratory of Geomechanics and Geoenvironment Protection | Xiud L.,PLA Logistical Engineering University
Open Civil Engineering Journal | Year: 2015

The finite element limit analysis method is applied to study the reinforcement concrete immersed tunnel at seabed under earthquake in this paper. FLAC3D is adopted to establish the equivalent model of reinforcement concrete, and the solution is executed according to elastic-plastic plane problem. Firstly, it is indicated that there are extreme strain values for concrete and reinforcement concrete, and the finite element limit method is adopted to calculate the ultimate shear strain value of equivalent material test pieces of reinforcement concrete of immersed tunnel so as to judge whether the immersed tube failures, thus, a new failure criteria for finite element limit analysis of immersed tunnel is provided. Secondly, the location and shape of failure surface of the immersed tunnel are simulated and its safety factor is obtained, and relation curve between subsidence displacement of top plate and strength reduction factors is combined to analyze the whole failure process of immersed tube. Finally, the influence law for safety factors of immersed tunnel under the function of different seismic wave. © Bo et al.; Licensee Bentham Open.


Li X.,PLA Logistical Engineering University | Li X.,Chongqing Key Laboratory of Geomechanics and Geoenvironment Protection | Miao C.,PLA Logistical Engineering University | Miao C.,Chongqing Key Laboratory of Geomechanics and Geoenvironment Protection | And 2 more authors.
Shock and Vibration | Year: 2016

The long duration and high impulse shock wave of thermobaric bomb threatens the security of underground structures. To obtain high resistance blast door against thermobaric shock wave, firstly, the dynamic mechanic property of high damping rubber was studied by split Hopkinson pressure bar (SHPB) equipment and the stress-strain relationship of high damping rubber under average strain rate of 5200/s was obtained. Secondly, the numerical model of interlayered high-damping-rubber blast door was established with ANSYS/LS-DYNA code based on test results, and the antiknock performance of interlayered high-damping-rubber blast door under thermobaric shock wave was analyzed by contrast with ordinary blast door. The results showed that the midspan displacement of the blast door decreased firstly and then increased with the increase of thickness of the high-damping-rubber interlayer, and the optimal thickness of the high-damping-rubber interlayer for energy consuming was 150 mm in the calculation condition of this paper. With the increase of the distance between the interlayer and the front surface of the door, the midspan displacement of the blast door decreased continually. The midspan maximum displacement of interlayered high-damping-rubber blast door decreased 74.5% in comparison to ordinary blast door. It showed that the high-damping-rubber structure can effectively improve the antiknock performance of blast door under thermobaric shock wave. © 2016 Xiudi Li et al.

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