【摘要】 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。更多还原

【Abstract】 Due to stability of rock structure is controlled by the joint,frictional energy on joints is proposed as an indicator of stability evaluation for rock structure around underground cavern. Relying on the underground cavern of Dagangshan hydropower station,numerical simulations with discrete element method are performed for different combinations of joint orientation,joint spacing and joint friction angle. Stability of rock structure is checked based on frictional energy and dynamic response of joints respectively. The applicability of friction energy on joints is discussed. Results show that the index proposed can be applied to evaluate the shear destruction of rock structure around underground cavern which can reflect failure rate,failure history and damage size of rock structure;consequent joints with inclination of 60° and consequent joints cutting at lower position of high sidewall are less favorable to the dynamic stability of rock structure.更多还原