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对巷道底板冲击地压诱发机理分析表明,水平应力是诱发底板冲击地压的最主要因素,并确定底板水平应力的计算方法。在对巷道底板岩层梁结构屈曲破断力学分析的基础上,建立了底板冲击地压诱发的判定准则。巷道有效宽度和底板岩层的分层厚度对底板岩层屈曲破断所需水平应力的影响较大,计算出最大水平应力作用下底板关键层以上各岩层屈曲破断的最大分层厚度。研究结果表明,巷道底板岩层层状特征较为明显且岩层分层厚度较小的区域易诱发底板冲击地压。
The mechanism analysis of rock burst induced by ground pressure shows that horizontal stress is the most important factor to induce floor pressure and the method of calculating horizontal stress of floor. Based on the analysis of the buckling and fracture mechanics of the beam in rock tunnel floor, the criteria of rock burst induced by floor are established. The effective width of the roadway and the stratification thickness of the floor rock strata greatly influence the horizontal stress required for the buckling fracture of the floor rock strata. The maximum stratified thickness of buckling and fracture of the strata above the key floor is calculated under the maximum horizontal stress. The research results show that the stratiform characteristics of the floor rock strata are obvious and the strata thickness of the strata are easy to induce the rock burst.