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地下工程开挖的扰动区和围岩的临界破坏深度是与稳定性分析和支护设计紧密相关的问题,应用塑性力学折线理论所得应力场新成果对圆形巷道的扰动区和围岩的临界破坏深度进行了研究。一般认为扰动区的大小是井巷或采场最大直线尺寸的3~5倍,但分析表明扰动区范围与外载的大小与作用形式、泊松比和埋深有关,有时会远远超出这个范围。在围岩临界破坏深度的确定中,导出了各向同性均质地层中圆形巷道的临界破坏深度公式,结果表明临界破坏深度与地层强度峰值的黏聚力、内摩擦角、容重和泊松比相关。研究成果可为圆形巷道的稳定性评价及支护设计提供依据。
The critical damage depth of disturbed area and surrounding rock of underground excavation is closely related to stability analysis and support design. Based on the new results of plastic field theory, Destruction depth was studied. It is generally considered that the size of the disturbance zone is 3 to 5 times of the maximum linear size of the shaft or stope. However, the analysis shows that the range of the disturbance zone and the size of the external load are related to the action form, the Poisson’s ratio and the buried depth, sometimes far exceeding this range. In the determination of the critical failure depth of surrounding rock, the critical failure depth formula of circular roadway in isotropic homogeneous formation is deduced. The results show that the critical failure depth and cohesion of formation strength peak, internal friction angle, bulk density and Poisson’s ratio Related. The research results can provide the basis for the stability evaluation and support design of circular roadway.