Original scientific paper

Fracture process and energy dissipation analysis of sandstone plates under the concentrated load

Shu-ren Wang orcid.org/0000-0001-5490-2825 ; (1) Opening Laboratory for Deep Mine Construction, Henan Polytechnic University, 2001 Century Avenue, Jiaozuo, Henan Province, 454003, China; (2) School of Civil Engineering and Mechanics, Yanshan University, No. 438 Hebei West Street, Haigang District, Q
Paul Hagan orcid.org/0000-0003-4011-2771 ; School of Mining Engineering, University of New South Wales, Sydney, East Wing, Old Main Building, Gate 14 Barker Street, Kingsford, NSW, 2052, Australia
Dian-fu Xu ; School of Civil Engineering and Mechanics, Yanshan University, No. 438 Hebei West Street, Haigang District, Qinhuangdao, 066004, China
Bao-wen Hu ; School of Civil and Environmental Engineering, University of Science and Technology Beijing, No. 30 Xueyuan Road, Haidian District, Beijing 100083, China
Ze-cheng Li ; School of Mining Engineering, University of New South Wales, Sydney, East Wing, Old Main Building, Gate 14 Barker Street, Kingsford, NSW, 2052, Australia
Kanchana Gamage ; School of Mining Engineering, University of New South Wales, Sydney, East Wing, Old Main Building, Gate 14 Barker Street, Kingsford, NSW, 2052, Australia

Abstract

Under the concentrated load, the tests on the brittle fracture of hinged arching until the rock-arch instability of the double-layer rock plates were conducted using self-developed loading device, and the influence factors on the rock-arch structure failure were analyzed by a numerical test based on the particle flow code (PFC). The results showed that the force-displacement curves of the double-layer rock plates displayed four phases: the small deformation elastic stage, the brittle fracture arching stage, the rock-arch structure bearing load stage and the rock-arch structure instability stage. The friction coefficient effect, cohesive strength effect of the layer between the two rock plates, and the size effect of the rock plate thickness were analyzed also. The numerical test results showed that the strain energy and strain energy entropy were consistent with the fracture instability process of the double-layer rock plates, which demonstrated that the strain energy entropy could characterize the steady state of the whole system of the double-layer rock plates.

Keywords

fracture; hinged rock-arch; instability; sandstone plates; strain energy entropy

Hrčak ID:

131328

URI

https://hrcak.srce.hr/131328

Publication date:

21.12.2014.

Article data in other languages: croatian

Visits: 1.484 *