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基于统一强度理论和塑性应变损伤模型,合理考虑中间主应力效应和剪胀特性,对高地应力下的圆形巷道进行弹塑性分析,由冲击地压扰动失稳理论建立圆形巷道临界冲击地压解析解。经与模型试验和工程实测数据比较,验证了解析解的正确性,并得出统一强度理论参数、剪胀参数、支护力、升降模量比和内摩擦角对临界冲击地压的影响规律。结果表明:确定高地应力下圆形巷道临界冲击地压时,不能忽略中间主应力和剪胀的影响。
Based on the unified strength theory and the plastic strain damage model, the middle principal stress effect and the dilatancy characteristic are reasonably considered, and the elasto-plastic analysis of the circular tunnel under high ground stress is carried out. The critical impact pressure of the circular tunnel Analytic solution. The correctness of the analytic solution is verified by comparison with the model test and the measured data. The influence of the uniform strength theory parameters, the dilatancy parameters, the supporting force, the ratio of the ascending and descending modes and the internal friction angle on the critical rockburst is obtained . The results show that the influence of the middle principal stress and dilatancy can not be neglected in the determination of the critical rockburst of a circular roadway under high ground stress.