Simulation of Sidewall Failure in Coal Mine Roadways Using an Extended Continuous Joint Model
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TECHNICAL ARTICLE—PEER-REVIEWED
Simulation of Sidewall Failure in Coal Mine Roadways Using an Extended Continuous Joint Model Xian-Jie Hao . Yi-Xin Zhao . Yu-Lin Li . Yan-Ding Guo . Bo Ren
Submitted: 1 April 2017 / Published online: 25 October 2017 ASM International 2017
Abstract Coal is well developed with beddings, and the beddings play an important role in the stability of tunnel stability of coal mine. This study focused on jointed rock mass with two sets of joint and proposed an extended ubiquitous model and associated numerical implementation accounting for joint spacing to represent geometric features of coal. The failure criteria of two sets of joint proposed in this paper not only accounted for joint spacing, but also contained the ubiquitous joint model. This extended theory was validated against the discontinuous deformation analysis method, the plane of weakness theory and experimental results for jointed coal with different joint fabric. The model is also used to analyze tunnel stability of roadways in coal mine with different joint spacing. The ubiquitous joint model could simulate jointed coal with small joint spacing, but for that with larger joint spacing, the ubiquitous joint model is not applicable and the joint model containing joint
X.-J. Hao State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Beijing 100083, People’s Republic of China X.-J. Hao Research Centre of Coal Resources Safe Mining and Clean Utilization, Liaoning Technical University, Liaoning 123000, People’s Republic of China X.-J. Hao (&) Y.-X. Zhao Y.-L. Li Y.-D. Guo College of Resources and Safety Engineering, China University of Mining and Technology, Beijing 100083, People’s Republic of China e-mail: [email protected] B. Ren State Coal Mining National Engineering Technology Research Institute, Anhui 232000, People’s Republic of China
spacing proposed by this paper should be used. A series of comparisons demonstrated that the proposed model was capable of considering the influence of joint spacing on jointed coal tunnel with two sets of joint. Keywords Coal mine Joint spacing Ubiquitous joint model Jointed coal tunnel Tunnel stability
Introduction The stability of a jointed coal tunnel, as geological material containing several sets of discontinuities (Fig. 1), has a close relationship with joint configuration (that is, joint orientation and spacing). Joint spacing plays an important role in determining the strength and deformation of a coal tunnel. If the joint spacing is too small, collapse may happen (Fig. 2). Several methods have been developed to evaluate the influence of joint spacing on the stability of jointed tunnel. Empirical methods, in which joint spacing (joint frequency) is considered in the rock classify system, include RQD [10], Rock Mass Rating (RMR) [4], Q [3], geological strength index (GSI) [20, 19], and RMi systems [26]. The International Society for Rock Mechanics classifies joint spacing into four grades, specifically, 6, 20, 60, and 200 cm
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