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深埋巷道大变形、强流变的破坏特征源于其高地应力的作用,准确分析已开掘巷道塑性区分布对巷道围岩变形影响、开掘方案选择及后续类似条件巷道布置意义深远。在围岩力学参数测试、地应力场测试的基础上,采用弹塑性理论、M-C准则、修正的“当量半径”理论简化计算了直墙半圆拱形断面布置下深埋巷道的围岩塑性区大小,分析了巷道围岩塑性区受采动应力、侧压系数单独及耦合作用影响规律。在侧压系数为0.5、垂直压力为35MPa时底板塑性区最大,其值为2.65m,建议加强巷道底板的支护与维护,并给出了塑性区控制方案。研究结果可为后续类似条件下巷道开掘方案优选、支护设计及围岩稳定性判定提供一定的借鉴。
The characteristics of large deformation and deep rheological damage in deep tunnel are derived from the effect of high ground stress. It is meaningful to accurately analyze the influence of the plastic zone distribution of the excavated tunnel on the surrounding rock deformation of the roadway, and to choose the digging scheme and subsequent similar conditions. Based on the testing of mechanical parameters of surrounding rock and the field stress field, the plasticity of surrounding rock in deep buried tunnel with semi-circular arched section with straight wall is simplified based on the elasto-plastic theory, MC criterion and modified “equivalent radius ” theory Area size, analyzed the plastic zone surrounding rock by mining stress, lateral pressure coefficient alone and the coupling effect of the law. When the lateral pressure coefficient is 0.5 and the vertical pressure is 35MPa, the plastic zone of the floor is the largest with a value of 2.65m. It is suggested to strengthen the support and maintenance of roadway floor, and the plastic zone control scheme is given. The results of this study can provide some reference for the optimization of roadway excavation scheme, support design and the judgment of surrounding rock stability under similar conditions.