【摘要】 针对仅以地震波作用中最后时刻或加速度值最大时刻的安全系数作为评价标准的问题,通过强度折减法,借助数值计算获得了地震载荷作用下安全系数的时程曲线。对于使用有限元强度折减法的失效准则,采用三种常用判据相结合的方法来确定安全系数,通过不同模型计算结果的比较,研究了动安全系数与动载荷时程和结构面数量之间的关系。计算结果表明:含结构面的岩质边坡最小安全系数出现时刻较地震波减速度最大值时刻超前,且结构面的存在对于边坡稳定性有着重要影响。最后分析了地震载荷作用下坡高、坡度、结构面倾角对动安全系数的影响,应用极限平衡理论部分验证了数值计算结果,所得安全系数时程曲线可为岩质边坡在地震载荷下的稳定性判断提供参考。更多还原

【Abstract】 To solve the problem of taking the safety coefficient at the last moment or the greatest acceleration moment as the evaluation criterion under seismic wave loading solely,the time-history curve of safety coefficient by using numerical calculation involved with strength reduction approach is obtained.For the selection of failure criterion when using the finite element strength reduction approach,three general slope stability judgment approaches are combined together to judge the failure of slope.Through comparing the results of various FEM models,the relationship between the safety coefficient and the time-history of seismic loading,as well as the relationship between the numbers of the structural surfaces are studied.The results obtained indicate that the minimum safety coefficient of rock slope including structural surface appears ahead of the greatest acceleration moment.Furthermore,studies on how safety coefficient curve be affected by the slope height,the slope inclination and structural plane angle are performed.The limit equilibrium theory is applied to verify the obtained numerical results.The safety coefficient curve obtained in this paper could be referenced for the judgment of rock slope stability.更多还原