错层位巷道围岩能量耗散分析

Analysis of energy dissipation for stagger arrangement roadway surrounding rock

在分析巷道侧向煤体破裂区、塑性区及弹性应力升高区外力功表达式的基础上,根据热力学第一定律,分别得到了对应分区的耗散能理论计算公式。根据围岩能量耗散值与外力对系统做功的比值确定了损伤变量,得出了破裂区损伤值>塑性区损伤值>弹性应力升高区损伤值的结论;对应于能量耗散,又得出了破裂区能量耗散>塑性区能量耗散>弹性应力升高区能量耗散的结论。镇城底矿错层位巷道布置工作面实测表明,布置于破裂区的巷道支承压力较小,巷道较易维护;当巷道上方为松散矸石,在支承压力作用下,松散矸石发生压密变形和塑性变形,其能量耗散更大,巷道更易维护。

Based on the analysis of the expression of the external work in lateral coal fractured zone, plastic zone and increasing zone of elastic stress, the corresponding energy dissipation formulas have been deduced, applying the first law of thermodynamics. The damage variable which is the ratio of energy dissipation value and external forces work for surrounding rock has been determined. Consequently, conclusions have been drawn that damage variable continuously decreases from fractured zone to plastic zone, till to increasing zone of elastic stress. For energy dissipation, it is similar to damage variable. Mineral pressure observation of stagger arrangement workface in Zhenchengdi mine shows that roadway has less support pressure in fractured zone, making it easy to maintain. When loose gangue is above roadway, it will produce compression deformation and plastic deformation under the action of support pressure. Its energy dissipation is bigger, making it easier to maintain.