论文部分内容阅读
为实现单一煤层采煤工作面瓦斯安全高效抽采、减小煤与瓦斯突出危险,特从损伤力学的角度入手,研究其损伤场的分布及演化规律。引入与开采步序相关的损伤变量,通过损伤度来描述岩体裂隙的分布特征,并根据弹塑性损伤理论编写了三维有限元程序,利用此程序对一工作面开采过程进行分析,给出了考虑材料损伤累积条件下围岩损伤场、体积应变和应力场的分布及演化规律。计算结果可为指导单一煤层卸压瓦斯抽放设计、提高瓦斯抽采率等提供理论依据。
In order to realize safe and efficient gas drainage in coal seam with single coal seam and reduce the risk of coal and gas outburst, the damage field distribution and evolution law are studied from the point of view of damage mechanics. The damage variables related to the mining sequence are introduced and the distribution characteristics of rock mass fissures are described by the degree of damage. According to the elasto-plastic damage theory, a three-dimensional finite element program is compiled. By using this program, the mining process of a face is analyzed. The damage field, volume stress and strain distribution and evolution of surrounding rock under the condition of material damage accumulation are considered. The results can provide a theoretical basis for guiding the design of gas drainage and gas drainage in a single coal seam and improving gas drainage rate.