Time-dependent laws and initial application of bearing features of bolt-grouting structure in soft rock roadway
WANG Xiang-yu1, 3, BAI Jian-biao2, 3, CHEN Yong2, MA Shu-qi1
1. School of Mines, Key Laboratory of Deep Coal Resource Mining, Ministry of Education of China; China University of Mining & Technology, Xuzhou 221116, China; 2. State Key Laboratory of Coal Resources and Mine Safety, China University of Mining & Technology, Xuzhou 221116, China; 3. Enterprise Academician Workstation of Jiangsu Province, Xuzhou Mining Group Co., Ltd., Xuzhou 221000, China
Abstract:Regarding the time-dependent behaviors of the bolting and grouting structure in soft rock roadway, the bearing capacity of bolt-grouting structure is treated as time-dependen value, and the elastic zone, plastic zone and bolt-grouting zone around the roadway are simplified as the stress analysis problem of a thick walled cylinder. Based on an elastic-viscoplastic constitutive model, the formulas for the bearing capacity of bolt-grouting structure are attained. The results show that the needed bearing capacity of bolt-grouting structure to stop rheology and rheological convergence/deformation increases with the increase of the ratio of (original rock stress) to (Tensile yield limit), and the more apparent the rheological features the more the support difficulty. The main reason for support failure and serious rheology is that the needed bearing capacity to stop rheology and rheological deformation increases because of the decrease of support strength and range. The value of the bearing capacity has close relationship with the bolt-grouting parameters, and it is very important that the appropriate bolt-grouting parameters can guarantee the stability of the bolt-grouting structure when rheology ends. The theoretical results reflect well the time-dependent laws of bearing capacity of bolt-grouting structure increasing with the increase of the rheological deformation, and they agree with the field observations, thus playing a great role in the design of bolt-grouting support structure in soft rock roadway.
王襄禹, 柏建彪, 陈勇, 马述起. 软岩巷道锚注结构承载特性的时变规律与初步应用[J]. 岩土工程学报, 2013, 35(3): 469-475.
WANG Xiang-yu, BAI Jian-biao, CHEN Yong, MA Shu-qi. Time-dependent laws and initial application of bearing features of bolt-grouting structure in soft rock roadway. Chinese J. Geot. Eng., 2013, 35(3): 469-475.
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