Deformation Law and Failure Mechanism of Anchorage-Surrounding Rock System of Puli Extra-large Bridge

Abstract

Abstract:

Abstract： The deformation law and failure mechanism of anchorage-surrounding rock system were studied by the 3D elasto-plastic numerical simulation using the finite difference method (FDM). The development of plastic zone, displacement and stress were analyzed with the increasing load. It is shown that at the designed cable force, the displacement of the system is maintained in millimeters. The hump of displacement between the anchorage and surrounding rock become clear under the increasing load. At the limit state, according to the displacement vector graph, the failure area of rock can be sketched, in which the upperlower destruction of surrounding rock are respectively 1.1 times and 0.5 times of the width of the back face of anchorage. The system has enough safety stability under the designed cable force. At aloading of 8 times of the cable force, the hoop and radial plastic zones achieve breakthrough. At the ultimate state, the plastic zones appear to be at an antiplug state. According to the displacement of the monitoring point, the plastic zones of surrounding rock and stress extension, the tensileshear complex failure caused by anchorage in surrounding rock may be in a failure mode.
Key words：

Key words: tunnel-typed anchorage-surrounding rock system, finite difference method, failure area, failure mechanism, plastic zone

CLC Number:

TU 42

TANG Hua,XIONG Xiaorong,DENG Qin,YUAN Conghua,WU Zhenjun. Deformation Law and Failure Mechanism of Anchorage-Surrounding Rock System of Puli Extra-large Bridge[J]. Journal of Shanghai Jiaotong University, 2015, 49(07): 961-967.

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