Numerical Analysis of Mechanical Behavior of Buried Pipes in Subsidence Area Caused by Underground Mining

Author:

Zhang Jie1,Xie Rui2

Affiliation:

1. School of Mechatronic Engineering, Southwest Petroleum University, Chengdu 610500, China e-mail:

2. School of Mechatronic Engineering, Southwest Petroleum University, Chengdu 610500, China

Abstract

The buried pipe crossing the subsidence area is prone to failure. The mechanical behavior of buried pipe in subsidence area was investigated in this paper. Effects of subsidence displacement, pipe parameters and soil parameters on the mechanical behavior were investigated. The results show that high stress appears on the pipe's surface and exceeds the yield strength after the strata subsidence. As subsidence displacement increases, the ranges of high-stress area and displacement increase, and the pipe section changes from a circle to an ellipse. The maximum axial strain occurs on the pipe in no-subsidence area. The maximum plastic strain and ovality of the pipe increase with the increasing of subsidence displacement. The displacement, plastic strain, and ovality of the pipe increase with the increasing of diameter–thickness ratio and buried depth. Internal pressure and friction coefficient has a little effect on the pipe displacement. The ovality decreases as internal pressure increases. The plastic strain and ovality increase with the increasing of the friction coefficient. As the elastic modulus and cohesion of soil increase, the displacement, plastic strain, and ovality of the pipe increase. The effect of Poisson's ratio on the deformation of pipe is small.

Publisher

ASME International

Subject

Mechanical Engineering,Mechanics of Materials,Safety, Risk, Reliability and Quality

Reference21 articles.

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2. Li, L., 2013, “Impact of Mining Subsidence on Long-Distance Pipe Stress and Deformation,” M.S. thesis, Beijing Jiaotong University, Beijing, China (in Chinese).

3. Preliminary Discussion on Geological Hazards Along the Pipe Project for Transferring Gas From Sichuan Province to Eastern China;Hydrogeol. Eng. Geol.,2007

4. Analytical Model for the Strain Analysis of Continuous Buried Pipes in Geohazard Areas;Eng. Struct.,2017

5. Characteristics of Pipe-Soil Interaction in Mining Collapse Areas;Chin. J. Geol. Hazard Control,2010

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