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根据岩体结构稳定性受节理面控制的特点,将节理摩擦能作为地下洞室岩体结构动力稳定性评价指标。依托大岗山水电站地下厂房,利用离散元法开展不同位置、倾角、摩擦角节理切割方案的动力计算,基于节理动力响应和节理摩擦能对比分析岩体结构稳定性,探讨节理摩擦能指标的适用性。结果表明,节理摩擦能适用于评价岩体结构剪切破坏情况,可反映洞室岩体结构在地震作用下破坏速度、破坏程度以及渐进破坏过程;顺倾切割时,倾角60°节理、高边墙下部切割节理对洞室岩体结构动力稳定性较为不利。
According to the characteristics of the stability of rock mass controlled by the joints, the joint friction energy is taken as the evaluation index of the dynamic stability of rock mass in underground caverns. Relying on the underground powerhouse of Dagangshan Hydropower Station, the dynamic calculation of joint cutting scheme with different positions, dip angles and friction angles was carried out by discrete element method. The stability of rock mass structure was analyzed based on joint dynamic response and joint friction energy, and the application of joint friction energy index Sex. The results show that the joint friction can be used to evaluate the shear failure of rock mass structure, which can reflect the failure speed, damage degree and progressive failure process of the rock mass structure of the cavern under the action of earthquake. When the inclination angle is 60 °, The cutting stability of the rock mass in the cavern is more unfavorable to the dynamic stability of the rock cutting structure in the lower part of the wall.