煤矿矸石充填材料压实耗能特性试验研究

Experimental Investigation on Compaction Energy Dissipation of Coal Gangue Filling Material

充填材料在压缩变形的过程中会吸收能量,对于煤矿的充填开采,充填材料的能量变化规律会对工作面的能量产生很大的影响,受力相同时,充填体吸收的能量越多,其周围岩体的能量变化就越小。所以,本文将利用试验的方法来研究固体充填材料的耗能问题。基于矸石的侧限单轴压缩试验,计算了矸石变形过程中单位体积的应变能,分析了不同粒径、不同加载速率和不同初始加载应力对矸石的耗能和变形破坏的影响。研究结果表明,矸石的粒径越小、加载速率越小、初始加载应力越大,相同应力条件下的变形就越小,达到相同应变时应变能密度越大,消耗的能量越多。矸石的耗能和变形主要分为3个阶段,其中第一阶段的变形占总变形量的50%左右,但能量消耗仅占总能耗的10%左右,第二阶段的变形占总变形量的25%左右,能量消耗也占总能耗的25%左右,第三阶段的变形占总变形的25%左右,但能量消耗占总能耗的65%左右。

Filing material will absorb energy in the process of compressive deformation, for filling mining, energy variation of filling materials will have a great impact on the energy of coal face, under the same stress condition, the more energy the filling body absorbs, the smaller energy changes the rock around. In this dissertation, laboratory will be adopted to study the energy consumption problems of solid filling material. Based on the confined uniaxial compression test of gangue, the strain energy of per unit volume is calculated, the effects of different particle sizes,different loading rates and different initial loading stresses on the energy dissipation and deformation failure of gangue were analyzed. The results show that： the smaller the particle size and loading rate, the smaller the deformation under the same stress condition and the larger the strain energy density under the same strain condition, the more energy is consumed. Energy dissipation and deformation of gangue is divided into three stages. The deformation of the first stage accounts for about 50% of the total deformation, but the energy consumption accounts for only about 10% of the total energy consumption, the second deformation stage accounts for the total deformation of the 25%, consumption also accounts for the total energy consumption of 25% or so, the last stage accounts for the total deformation of 25% about, but the energy consumption of about 65% of total energy consumption.