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基于极限平衡理论,根据浸润线的位置推导砂土边坡在渗流和地震双重工况下的稳定性解析式,通过程序求解稳定性系数。解析法考虑了地震的振动特性和水压的变化,物理过程更为真实,二者产生的孔隙水压力作用于滑动面,显著地降低了边坡的稳定性,并随水位的增高而作用明显。通过算例比较得出:考虑渗流和地震计算的稳定性系数与动力时程法的结果接近,不同水位下的稳定性系数最大误差不超过5%;而与规范法结果相比,最大误差达14.2%,验证了解析式的合理性。解析法计算思路简单,结果实用,能够为进一步研究边坡的失稳评价提供理论基础。
Based on the theory of limit equilibrium, the stability analysis formula of sand slope under seepage and earthquake conditions is deduced according to the position of wetting line, and the stability coefficient is solved by program. The analytic method takes into account the vibration characteristics of the earthquake and the change of the water pressure. The physical process is more realistic. The pore water pressure generated by the two acts on the sliding surface, significantly reducing the stability of the slope, and obviously increases with the water level increasing . The results show that the stability coefficient considering seepage and earthquake calculation is close to the result of dynamic time history method, and the maximum error of stability coefficient under different water level is less than 5%. Compared with the results of normal method, the maximum error reaches 14.2%, verifying the rationality of analytic formula. The analytic method has a simple calculation method and a practical result, which can provide a theoretical basis for further research on slope instability evaluation.