Abstract: Based on the limit equilibrium theory, a physical mechanics model for secondary toppling of anti-inclined slopes with rock and soil composition subjected to seismic loads was established by the method of step-by-step analysis. The theoretical calculation method for the stability safety factor of the anti-inclined rock-soil composite slope under the slope top load and earthquake was deduced, and the corresponding calculation program was compiled by using MATLAB software. The influence law of the whole stability and failure mode of anti-inclined rock-soil composite slope subjected to seismic loads was analyzed. The research results show that when the seismic influence coefficient increases continuously, the slope safety coefficient decreases rapidly, the residual sliding force at the slope toe increases, the number of sliding and toppling rock strata in the slope increases, the number of stable rock strata decreases, and the slope rock strata are unstable and damaged. The smaller the values of rock stratum dip angle, slope surface dip angle and rock thickness are, the more lagged the influence of seismic action on slope stability is. Under the different rock strength parameters in rock strata cross-sections and slope top loads, the influence law of earthquake action on the overall stability of slope is basically the same, and when k=0.2~0.3, the slope safety coefficient appears inflection point.

Key words: geotechnical engineering, seismic loads, anti-inclined slope, secondary toppling, stability analysis

摘要： 基于极限平衡理论，通过顺次传递分析方法，建立了地震作用下反倾岩土复合边坡次生倾倒破坏的物理力学模型，推导了反倾岩土复合边坡在坡顶荷载、地震等作用下的稳定安全系数理论计算方法，并运用MATLAB软件编写了相应的计算程序，分析了地震荷载作用对反倾岩土复合边坡的整体稳定性和坡体破坏模式的影响规律。研究结果表明：当地震影响系数不断提高时，边坡安全系数迅速减小，坡脚剩余下滑力增加，坡体中滑动岩层和倾倒岩层数量均增加，稳定岩层数量减小，坡体岩层失稳破坏；岩层倾角、坡面倾角和岩层厚度的值越小，地震作用对边坡稳定性的影响越滞后；不同岩层横截面岩石强度参数和坡顶荷载作用下，地震作用对边坡整体稳定性的影响规律基本一致，坡体安全系数在k=0.2~0.3时出现拐点。

关键词: 岩土工程, 地震荷载, 反倾边坡, 次生倾倒, 稳定性分析