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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。
Aiming at the problem that only the safety factor of the last moment or acceleration moment in earthquake action is taken as the evaluation criterion, the time history curve of safety factor under earthquake load is obtained by means of strength reduction method. For the failure criteria using finite element strength reduction method, three common criteria are used to determine the safety factor. The dynamic safety factor is compared with the calculated results by different models. Relationship. The results show that the minimum safety factor of rock slope with structural plane appears ahead of the maximum value of seismic deceleration, and the existence of structural plane has an important influence on the stability of slope. Finally, the influence of slope height, slope and structural face inclination on dynamic safety factor under earthquake load is analyzed. The numerical results are verified by the theory of limit equilibrium. The obtained safety factor time history curve can be used for the rock slope under earthquake load Provide a reference for judging the stability.