Original scientific paper

https://doi.org/10.17559/TV-20191227133029

Comparative Analysis on Elastic-plastic Analytical Methods for Tunnel Surrounding Rocks

Chuanqi Zhu orcid.org/0000-0002-7080-0519 ; State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines, Anhui University of Science and Technology, No.168, Taifeng Road, Huainancity, Anhui Province, China, 232001
Xingang Niu ; State Key Laboratory of the Gas Disaster Detecting, Preventing and Emergency Controlling, No. 55, Shangqiao No. 3 Village, Shapingba District, Chongqing, China, 400044
Huaifu Liu ; State Key Laboratory of the Gas Disaster Detecting, Preventing and Emergency Controlling, No. 55, Shangqiao No. 3 Village, Shapingba District, Chongqing, China, 400044
Haifeng Ma ; School of Mining and Safety Engineering, Anhui University of Science and Technology, No.168, Taifeng Road, Huainancity, Anhui Province, China, 232001
Zhenhua Jiao ; State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines, Anhui University of Science and Technology, No.168, Taifeng Road, Huainancity, Anhui Province, China, 232001

Abstract

Elastic-plastic analysis is an important way to obtain the mechanical characteristics of surrounding rocks. However, selecting a reasonable analytical method is difficult. To explore the differences between the surrounding rocks constitutive relation and yield criterion analytical methods, the stress distribution and deformation characteristics of tunnel surrounding rocks at the −817 m firefighting material chamber of the Wangfenggang Well, Xieyi Mine, Huainan Coal Industry Group (China) were analyzed by using the bilinear constitutive relation and unified strength criterion analytical methods. Calculated results of the two analytical methods were compared. The radius and displacement evolution laws of the plastic region on tunnel surrounding rocks with in situ rock stress and supporting resistance were discussed. Results demonstrate that compared with the unified strength criterion analytical method, the bilinear constitutive relation analytical method avoids the influences of intermediate principal stress coefficient on results and the tangential stress distribution curve is smooth. The calculated radius of the plastic region and periphery displacement of the tunnel are 4,365 m and 87,373 mm, which are higher than those of the unified strength criterion analytical method. Stress difference is a major factor that influences the mechanical characteristics of tunnel surrounding rocks. As the stress difference decreases from 20,4 MPa to 16,4 MPa, the radius of the plastic region and periphery displacement of the tunnel decrease by 0,697 m and 26,73 mm, respectively. This study provides theoretical references for the practical selection of elastic-plastic analytical method for tunnel surrounding rocks.

Keywords

bilinear constitutive relation; elastic-plastic analytical method; stress difference; tunnel surrounding rocks; unified strength criterion

Hrčak ID:

236785

URI

https://hrcak.srce.hr/236785

Publication date:

15.4.2020.

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