采矿与安全工程学报2016，Vol.33Issue(2)：199-207,9.DOI:10.13545/j.cnki.jmse.2016.02.002
大采高采场覆岩破断演化过程及支架阻力的确定
Overlying strata failure process and support resistance determination in large mining height face
摘要
Abstract
Based on the failure control conditions of “intensity parameters-stress environment-weak planes of joints” in coal-rock mass, the failure characteristic of overlying strata in large mining height face was studied, the simulation of failure process was conducted in the laboratory, and the determina-tion of support resistance was theoretically analyzed. The following conclusions can be made: The cav-ing of layers with thin and low strength depends on the scope of abscission layer, the main roof is char-acterized by the deformation feature of the clamped beam, and the position of fracture line depends on the scope of shear dislocation fracture. Tensile stress shows a continuous distribution type in thin and low strength strata, whereas a non-isolating distribution type is presented in thick and high strength strata. Shear-closed interlaminar fracture develops prior to the face as an inverted trapezoidal form in large scale, whereas tension-open fracture develops inferior to the face as an upward trapezoidal form in small scale. After fracturing, the lower main roof can form single key block structure and the higher main roof can form static three-hinged arch, and the stability of lower main roof is the key of roof con-trol. Determination of the range of immediate roof is put forward according to the condition of single key block structure in lower main roof, the computational formula of roof pressure is deduced based on the principle of conservation of energy, and the influential degree of immediate roof property on each parameter is thus determined: cohesion > plastic modulus> friction.关键词
大采高采场/破坏条件/基本顶结构/直接顶/支架阻力Key words
large mining height face/failure condition/main roof structure/immediate roof/support resistance分类
矿业与冶金引用本文复制引用
杨胜利,王兆会,孔德中,程占博,宋高峰..大采高采场覆岩破断演化过程及支架阻力的确定[J].采矿与安全工程学报,2016,33(2):199-207,9.基金项目
国家重点基础研究发展计划(973)项目(2013CB227903)；国家自然科学基金项目(U1361209，51574244)；煤矿安全高效开采省部共建教育部重点实验室开放基金项目(JYBSYS2014107) （973）
