洪水作用下受锚土质边坡稳定可靠性分析

为研究洪水对路基高陡土质边坡稳定性的影响，通过现场统计、理论推导和工程试验，构建受锚土质边坡的6种破坏模式，得到洪水作用下受锚土质边坡的失效模式、锚固结构的蠕变模型和时效可靠度解析式。以土体抗剪强度指标为基本随机变量，通过一次二阶矩法，得到考虑时间效应的受锚边坡系统可靠度指标的理论解析式。算例显示:可靠度指标随时间延续具有显著的指数衰减特征，在洪水作用早期时效可靠度指标变化非常明显；随着锚固力增加，时效可靠度指标增加，随着地下水渗透有效应力增加，抗剪强度指标提高，边坡时效可靠度指标增加。

Analysis on Reliability of Anchored Subgrade Slope Stability Based on Flood Effect

In order to study the influence of flood on the stability of the high and steep soil slope of subgrade, six failure modes of the anchored soil slope were constructed through field statistics, theoretical derivation and engineering tests, and the failure modes, creep model of the anchored soil slope and the analytical formula of the age reliability under the action of flood were obtained.Taking the shear strength index of soil as the basic random variable and using the first-order second-moment method, the theoretical analytical formula of the reliability index of the anchor slope system considering the time effect is obtained. The calculation example shows that the reliability index has a remarkable exponential attenuation characteristic with time, and the change of the age reliability index is very obvious at the early stage of flood action, with the increase of anchorage force, the index of age reliability increases; with the increase of effective seepage stress of groundwater, the shear strength index and the time-dependent reliability index of slope increase.