Informatics Publishing Limited

Zuyin Zou ¹, Hang Chen ², Zexin Wang ¹, Xuemei Long ¹, Yulong Chen ³

Affiliations
1 College of Civil Engineering, Sichuan Agricultural University, Dujiangyan-611830, CN
2 College of Civil Engineering, Southwest Jiaotong University, Chengdu-610000, CN
3 Department of Civil Engineering, The University of Tokyo, Tokyo-113-8656, JP

Abstract

Traditional strength reduction methods employ same reduction factor to get safety factors of frictional angle φ and cohesion c of slide slopes. In the actual slope destruction, however, different shear strength parameters have different action effects. For this reason and considering that sliding resistance effect of sliding mass is much bigger than the difference of shear resisting factor φ and c. Taking a side slope for example, the finite difference software FLAC3D is used to search the cut-through area of shear strain increment under limiting condition to find potential slip surface. Then the shear resisting factor φ and c of sliding mass are reduced. Each reduction method has different safety factors and slip surface, and several slip surface form a potential gliding area. Results indicate that the traditional single safety factor method is a special case of two safety factors method. With increasing strength reduction factors of frictional angle and cohesive force, gliding surface gradually moves from deep layers to superficial layers. Slip surfaces found by different strength reduction methods form a certain gliding area with the sole reduction of shear resisting factor φ and c as its upper and bottom boundary. Stability analysis by two safety factors is more accurate than that by traditional strength reduction method and provides reliable technical support for study of side slope stability and its reinforcement.

Keywords

Analysis of Slope Stability, Strengthen Reduction Method, Safety Factor, FLAC3D.

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Zuyin Zou ¹, Xianghui Kong ², Hang Chen ³, Xuemei Long ¹

Affiliations
1 School of Civil Engineering, Sichuan Agricultural University, Dujiangyan-611830, CN
2 School of Transportation Engineering, Shandong Jianzhu University, Jinan-250101, CN
3 School of Civil Engineering, Southwest Jiaotong University, Chengdu-610031, CN

Abstract

With the development of high speed railway, ballastless track has been more widely used because of its own merits. Different track types lead to changes of dynamic properties in the railway structure. To discuss the dynamic interaction in the system of track and subgrade under train loads, the dynamic simulation method of ballastless track-subgrade system was studied using the ABAQUS finite element software. Based on this, the 3D model of slab ballastless track-subgrade in SuiYu railway was established. Through analysis of simulation results, the distribution law of dynamic stress of slab track and subgrade was acquired, and the effect of train speed on the dynamic property of track and soil subgrade was investigated. The research results indicate that along railway cross section, the dynamic stress of track structure is distributed unevenly, while it is more uniform on the surface of subgrade. Meanwhile, the dynamic stress of track and subgrade surface substantially increases linearly with train speed, but the attenuation law of dynamic stress along subgrade depth has little effect by the speed.

Keywords

Ballastless Track, High-Speed Railway, Dynamic Properties, Numerical Simulation, Train Speed.

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