【摘要】 应用自主开发的岩石破坏过程渗流与应力耦合分析软件F-RFPA2D,通过对高应力节理岩体中巷道的失稳破坏过程所进行的数值模拟分析,研究了深部断续节理岩体中地应力及渗流对巷道稳定性的影响。模拟结果不但直观形象地给出了巷道的渗流场、应力场、破坏区分布,而且得到了巷道周边关键部位的位移变化情况,并与无地下水的稳定性进行了比较。结果表明,岩体中断续节理与地应力及渗流相互作用,对巷道失稳的演化起了重要作用,如巷道与节理的相对方位决定了巷道坍塌的方向;岩桥对巷道的稳定起了重要的作用;虽然渗流应力加速了巷道的失稳破坏,但没有改变高地应力对巷道的主要破坏模式。该研究对于进一步理解深部岩体中节理、地应力及渗流对巷道稳定性的影响进而采取有效的加固措施具有重要的理论和实践意义。更多还原

【Abstract】 Based on mesoscopic damage mechanics,numerical code F-RFPA2D is developed to simulate the failure process of roadway in high stress rock mass with intermittent joints.The influence of geostress and seepage on stability of deep roadway surrounding rock mass with intermittent joints is investigated.The simulation results give not only the visual image of seepage field,stress field,failure areas distribution of the roadway surrounding rock mass,but also displacement changes of key points of the roadway surrounding rock mass;moreover,stabilites of the roadway surrounding rock mass with groundwater and without groundwater is compared.The simulation results reveal that interaction among intermittent joints and geostress and seepage in rock mass plays an important role in evolution of roadway instability;for example,the direction of roadway collapse depends on the relative orientation of roadways and joints.Rock bridge plays an important role in the stability of the roadway.Although the seepage stress may accelerate instability of the roadway;the main failure modes of the roadway under high geostress is not changed by the seepage stress.The study has important theoretical and practical significance for further understanding the effect of the joints,stress and seepage on stability of deep roadway;and then to take effective reinforcement measures to deep roadway.更多还原