综放工作面顶煤承载能力和支架工作阻力的探讨

Bearing Capacity of Top-coal Body and Working Resistances for Supports in Coal Faces with Sublevel Caving

支架工作阻力计算是综放开采研究的主要问题之一。在对顶煤力学性质进行了实验室试验的基础上,总结出顶煤破坏时的强度满足主应力表示的莫尔-库仑强度准则。根据综放工作面顶煤体的受力特点,运用损伤力学应变等效原理,建立了综放工作面控顶距内顶煤体受力力学模型。从顶煤体承载能力的角度,研究综放面支架-顶煤体之间相互作用关系,推出了支架工作阻力的理论计算公式。该模型较好地解释了综放工作面支架工作阻力随顶煤强度的提高而增加的矿山压力显现。研究结论对综放面支架工作阻力计算具有一定的理论指导意义。

The calculation on working resistances of supports has been one of key research questions for coal faces with sublevel caving. Based on experimental results of mechanical property of top-coal, it is the top-coal failure strength meeting Mohr-Coulomb Theory that is summed up. According to force characteristic of top-coal body in coal face with sublevel caving, using strain-equivalent principle of Damage Mechanics, the authors set up bearing mechanical model for top-coal body within face width. From the top-coal bearing capacity point of view, the interaction relationship between supports and top-coal body is studied. Theoretical calculation formula on working resistance of supports is deduced. Ground press behaviors which working with resistances of supports are increased with top-coal strength increment were better explained with this model. The conclusions have a definite direction value for calculating working resistances of supports in coal faces with sublevel caving.