流固耦合分析水压及采掘扰动影响下巷道围岩的塑性损伤
The Plastic Damage of Surrounding Rock Under the Influence of Confined Water Pressure and Mining Disturbance With Fluid-solid Coupling Analysis
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摘要: 利用Comsol4.2a有限元多物理场耦合软件，“动态”剖分模型采掘空间，通过计算识别塑性损伤判据函数F′≥0的区域，最终模拟模拟了在不同采掘扰动范围、不同含水层与断层水压力影响下巷道围岩发生塑性损伤变化情况，结果显示：岩体水压不变时, 采掘扰动形成的应力集中区的塑性损伤范围大于采场底板，且随着采场宽度的延伸，围岩在垂向及水平方向塑性损伤范围增大；采场宽度不变时，随着岩体水压的增大，导致围岩力学强度降低，塑性破坏范围增大，且断层带内塑性损伤加剧。Abstract: The article simulates rock plastic damage change situations under the influence of different mining disturbance scope, different aquifers and fault water pressure through identifying the area of plastic damage function F′≥ 0, by using "Dynamic" model mining space in Comsol4.2a multi-physics coupling software. The results showed that the plastic damage scope in stress concentration zone where was formed by mining disturbance was greater than the mining floor, and with an extension of the scope of mining, the scope of plastic failure zone in the rock surrounding including the vertical and horizontal was increased; with the increase of water pressure, the surrounding rock mechanical strength decreased, and the increase scope of the plastic collapse, and plastic damage increased within the fault zone.
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