STUDY OF STRENGTH THEORY AND APPLICATION OF OVERLAP ARCH BEARING BODY FOR DEEP SOFT SURROUNDING ROCK
(1. Hunan Provincial Key Laboratory of Safe Mining Techniques of Coal Mines，Hunan University of Science and Technology，Xiangtan，Hunan 411201，China；2. School of Energy and Safety Engineering，Hunan University of Science and Technology，Xiangtan，Hunan 411201，China；3. Civil and Environment Engineering School，University of Science and Technology Beijing， Beijing 100083，China)
Abstract：At present，the combined support method of long anchor cable and bolt shotcrete mesh is widely used in deep soft surrounding rock，but it is very deficient in understanding on bearing behavior of the combined supporting structure；and it still lacks quantitative analytical formulae especially for bearing capacities of primary supporting and secondary supporting. In allusion to the united supporting characteristics of anchor，spray net and cable of deep wall rock，the mechanical model of overlap arch bearing body were put forward based on rock mechanics theory，which are composed with the main compression arch(bolt supporting) and the secondary compression arch(intensive cable supporting). By means of elastoplastic theory，neutral point theory of bolt and force transferring mechanism of cable，strength equations of the bearing body of primary supporting and second supporting were deduced. Community composed of wall rock and supporting structure is regarded as an equivalent coupling surrounding rock；and relation equations of rock mechanics parameters of surrounding rock with release displacements(yield displacements) were obtained from the method of elastoplastic mechanics. Computational results of engineering indicate that the peak intensity and bearing capability of rock mass were enhanced obviously for the breaking cavity of Jinchuan Mine III after the support of overlap arch；the limit bearing capacity of equivalent coupling surrounding rock can reach 513.34 kN；the value of can reach 47.54º and the value of can reach 1.37 MPa. Monitoring data also show that deformations of surrounding rock supported by overlap arch bearing body trend to be stable，convergence rate of which is less than 0.1 mm/d.
余伟健1，2，高 谦3，朱川曲1，2. 深部软弱围岩叠加拱承载体强度理论及应用研究[J]. 岩石力学与工程学报, 2010, 29(10): 2134-2142.
YU Weijian1，2，GAO Qian 3，ZHU Chuanqu1，2. STUDY OF STRENGTH THEORY AND APPLICATION OF OVERLAP ARCH BEARING BODY FOR DEEP SOFT SURROUNDING ROCK. , 2010, 29(10): 2134-2142.
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2010, Vol. 29 
