综放沿空异形煤柱留巷系统力学场演化规律

Stress evolution of an irregular pillar protected roadway system remained along goaf in fully mechanized top-coal caving mining field

研究了不同煤柱宽度时综放沿空异形煤柱锚网支护留巷系统围岩应力分布和破坏特征.揭示了煤体边缘水平应力和垂直应力峰值不耦合的规律以及巷道顶板应力峰值随煤柱宽度不同而演化的轨迹.深入探讨了综放沿空留巷岩石力学系统的控制变量,并根据控制变量的取值对系统稳定性区域进行了划分,对不同煤柱宽度时的巷道系统稳定性进行了综合分析和评价,对综放沿空留巷合理护巷煤柱宽度提出了建议.提出并实施了“以加固沿空异形煤柱为主、悬承锚网支护留巷圈为辅”的综合控制技术.

The stress distribution and its evolution modes in surrounding rocks of a roadway were comprehensively studied with respect to different pillar widths, where the roadway had been protected by an irregular pillar remained along the goaf in mechanized top-coal caving mining and supported by bolt-mesh technique. The study manifested the uncoupled pattern of the peak stresses in vertical and horizontal directions, as well as the stress evolution trace varying with pillar width. The control variable was pointed out for the mechanical system, and the different stability areas were distinguished correspondent to its value. Through the general analysis and assessment on stability of the roadway system protected by the pillar with different widths, the reasonable pillar width was promoted for effective protection of the roadway in mechanized top-coal caving mining panel. A comprehensive control technique was proposed and employed in practice through reinforcing the irregular pillar as a main way and hanging the mesh and bolt rock mass as a auxiliary means to support the gateway remained along the goal.