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Xu L.,Kunming University of Science and Technology | Liu W.,Kunming Prospecting Design Institute of China Nonferrous Metals Industry
Advanced Materials Research | Year: 2013

The liquefaction problem of saturated sand under cyclic loading is essentially a dynamic strength problems,but under the action of load,its strength has a sudden dramatic loss and it is unexpected.so it is different from the general dynamic strength problem.This paper analyzes the dynamic strength of saturated sand under cyclic loading.And its vibration liquefaction mechanism, influencing factors and preventive measures are analyzed and discussed. © (2013) Trans Tech Publications, Switzerland. Source


Liu W.-L.,Kunming University of Science and Technology | Liu W.-L.,Kunming Prospecting Design Institute of China Nonferrous Metals Industry | Wei L.-D.,CAS Wuhan Institute of Rock and Soil Mechanics
Yantu Lixue/Rock and Soil Mechanics | Year: 2010

Due to the limitation of the numerical models of anchors by finite element method (FEM) in geotechnical engineering at present, an anchor model which is fit for the strength reduction FEM is put forward. Strength reduction FEM considering the anchor model is proposed. The corresponding program is also developed; and the proposed model and method are tested by a case study calculation results of a simple rock slope reinforced with anchors. At last the model is used in evaluation of a soil slope stability; and the results of this example indicate that the model is convenient and feasible. Source


Yu Z.H.,Kunming University of Science and Technology | Gui Y.,Kunming University of Science and Technology | Wang Z.C.,Kunming Prospecting Design Institute of China Nonferrous Metals Industry | Hou Y.J.,Kunming University of Science and Technology
Advanced Materials Research | Year: 2014

In allusion to double sheet piles(DSP) global optimal solution, the response surface(RS) technique based on Uniform Design- Support Vector Machine(UD-SVM) was introduced to build the RS by nonparametric regression, thus to avoid the complex non-linear RS form between the double sheet piles parameters and indexes under the current standard. Use the Monte Carlo simulation as generator to produce samples, the RS can do considerable and non-repetitive efficiency prediction and get global optimal value satisfying to the target value with high accuracy and stability, also without figuring out the explicit formulations. This article applied the method to a double sheet piles optimal design, and took minimum engineering quantity as criterion to screen for the optimal parameters aiming at illustrating the feasibility. © (2014) Trans Tech Publications, Switzerland. Source


Chen J.,Kunming University of Science and Technology | Xu Z.,Kunming University of Science and Technology | Zhang J.,Kunming University of Science and Technology | Liu W.,Kunming Prospecting Design Institute of China Nonferrous Metals Industry
Chongqing Daxue Xuebao/Journal of Chongqing University | Year: 2014

In order to find out the effect of site structure and distribution of cut-fill area on the seismic responses rules of Xigeda formation three-dimensional subgrade in Xichang, finite element method software is used to simulate the acceleration distribution on the surface of three-dimensional calculation models under seismic load. This paper discusses differences of subgrade seismic response from three aspects, including platform structure of the site, elevation mutation, and excavation and filling area. And there are four conclusions can be drawn. Firstly, the higher the elevation sites platform is, the greater the acceleration amplification factors are, especially in the changes of vertical acceleration amplification factors. Secondly, a sudden increase of elevation causes a sudden increase of vertical acceleration magnification factors, and acceleration amplification factors is getting smaller while extending to the platform inside. Thirdly, the acceleration amplification factors of filled area are greater than those of the excavation area. Fourthly, because terrain amplification of the seismic response is directional, three-dimensional calculation models should be used to numerical analysis. The results provide an important basis for the Xigeda subgrade base plan selection in Xichang and seismic design. ©, 2014, Chongqing Medical University. All right reserved. Source


Zhang J.,Kunming University of Science and Technology | Xu Z.,Kunming University of Science and Technology | Liu W.,Kunming Prospecting Design Institute of China Nonferrous Metals Industry
Wuhan Ligong Daxue Xuebao (Jiaotong Kexue Yu Gongcheng Ban)/Journal of Wuhan University of Technology (Transportation Science and Engineering) | Year: 2012

In order to study the seismic response of Xichang Xigeda step terrain elevation mutation on the ground motion. Foundation engineering of the Panzhihua Vanadium and Titanium Steel new base in Xichang has been selected as background. Two Foundation programs were studied as the research objects, two three-dimensional foundation models built with finite element software simulated distribution in three directions of ground motion acceleration of model surface. Following conclusions have been concluded: terrain elevation step mutation has very small influence on the horizontal acceleration amplification coefficient but vertical acceleration amplification factor surge. Whether it increases with the increase of elevation mutation, further study is needed; From the ladder terrain extends to the inside corner point, the vertical acceleration amplification factor decreases; vertical acceleration amplification factor decreases with increase of ground motion intensity; the greater the intensity of seismic waves inputs the more significantly vertical acceleration caused by elevation mutations increases. Source

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