渗流耦合作用的基坑两级边坡应力场分析

Stress Field Analysis of a Stepped-Slope Pit Based on the Seepage Coupling Method

将渗流场与应力场进行耦合迭代得到两级边坡含有地下水时的应力分布,并将计算结果与现场实测位移进行比较。结果表明,耦合场作用的最大水平位移出现在坡顶,比不耦合法结果要大。竖向沉降位移和总位移两种方法的数据结果变化规律相同,平台以上耦合法数值高于不耦合法,以下两者基本接近。耦合法计算的总应力要大于不耦合结果,这与渗透应力的双向耦合作用是一致的,耦合法结果更接近实测数据,也进一步证明了渗透力的影响是显著的。值得注意的是平台位置处的位移及应力出现异常,不耦合结果高于耦合值,与传统的单级边坡分布特点并不一样。

The foundation pit stress field characteristics after impoundment were analyzed by the seepage-stress coupling method,and the results were compared with the field test data. The results show that the maximum horizontal displacement of the coupling field appeared on the slope top,and its value was larger than that from no coupling method results. The variation laws of vertical settlement and total displacement based on both methods were similar,and the coupling results were also larger than those by no coupling method upon the slope platform,but the results were essentially the same for the case under the platform. The stress field results show that the total stress of coupling method is larger,and this character is consistent with that frommutual coupling of seepage-stress fields,and it is proved that the seepage force has significant effect. It is noteworthy that the stress and displacement distribution in platform is different from the single-slope results,the no coupling method values were higher.