Evaluation of potential failure of rock slope at the left abutment of Jinsha River Bridge by model test and numerical method

doi:10.1007/s11709-013-0206-x

Front Struc Civil Eng

0, Vol.

Issue () : 332-340 https://doi.org/10.1007/s11709-013-0206-x

RESEARCH ARTICLE

Evaluation of potential failure of rock slope at the left abutment of Jinsha River Bridge by model test and numerical method

Zhiming ZHAO¹(

), Xihua WANG²

1. Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 610031, China; 2. School of Resources and Environment, Southwest Petroleum University, Chengdu 610500, China

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Abstract

Jinsha River Bridge is located on Tiger Leaping Gorge town, China. The left bank slope composes of moderately thick layer of slate overlain by schistose basalt, and where rocks are controlled by two sets of joint planes. To evaluate the stability of the rock slope under bridge foundation, model test and calculation model based on the geological parameters and the slope stability was simulated and analyzed using Universal Distinct Element Code (UDEC) and Finite Element Mehod (FEM). According to model test, failure mainly initiated at the toe with shear movement along the joint planes, eventually resulting in the sliding along the slope surface and formation of tension crack at the crest of the model. This result coincide with the UDEC model, which shows that slope surface will produce loosening damage and slipping expected along the joint planes under different loading conditions. Moreover, the result of FEM analysis indicates that the rock mass under the main pier has potential shear failure region. So, the bridge foundation should be strengthened to prevent the slope failure under external forces.

Keywords slope stability strength properties model test numerical analysis

Corresponding Author(s): ZHAO Zhiming,Email:zmzhao@swjtu.cn

Issue Date: 05 September 2013

Cite this article:

Zhiming ZHAO,Xihua WANG. Evaluation of potential failure of rock slope at the left abutment of Jinsha River Bridge by model test and numerical method[J]. Front Struc Civil Eng, 0, (): 332-340.

URL:

https://academic.hep.com.cn/fsce/EN/10.1007/s11709-013-0206-x
https://academic.hep.com.cn/fsce/EN/Y0/V/I/332

Fig.1 Location map of the proposed bridge site

Fig.2 Panorama view of the left bank slope outcrop at the bridge site

Tab.1 shear strength properties of structural planes calculated based on Barton model.

Tab.2 Shear strength parameters of the structural planes based on direct shear test

Fig.3 Shear strength-normal stress diagrams of (a) schistose plane, (b) Joint No. 1 and (c) joint No. 2

Fig.4 General sketch showing the dimensions and properties of the designated model

Fig.5 Figures (a) and (b) are the model of the left bank slope (before testing) under gravity and bridge loading respectively, where (c) and (d) are the characteristic failure of the left bank slope under gravity and bridge loading (after testing) respectively

Tab.3 Model material properties for rock-like model.

Fig.6 Characteristic failure of slope under (a) gravity; (b) bridge loading and (c) Static and seismic loading

Fig.7 Ansys calculation model and the boundary condition

Fig.8 Results of finite element analysis of the slope at the site area. (a) Before applying stress; (b) under bridge foundation; (c) under seismic force

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