边坡加权位移反演方法及工程应用研究

STUDY OF INVERSION METHOD FOR ANALYSIS SLOPE WEIGHT DISPLACEMENT AND ENGINEERING APPLICATION

参数反演是获得岩土强度参数的重要手段,而对于分层或者含有软弱夹层的边坡,加权位移反分析是获得其土体参数的有效反演方法。利用边坡测斜数据与土体分块的基本思想,提出了一种加权方法。根据土体深部位移曲线与最小二乘原理,将边坡土体划分为若干个具有不同位移特点的块体,单个块体的位移可以用两个量进行表示:滑动位移与变形位移。将反映块体自身强度的变形位移作为加权反分析的权重,并提出了新的反演目标函数。最后,依托实际工程,利用新方法计算了边坡的强度参数,其结果与现场试验符合较好。同时,敏感度计算的结果也表明该方法的反演效果更佳。

The inversion analysis is an important way to obtain the geotechnical strength parameters , especially, for weak intercalated layer slope , weighted displacement back analysis is an effective method to get its soil parameters . Based on the inclination data and basic idea of block division , a new calculated approach for displacement weight was proposed .By displacement curve and least square method , the slope soil was divided into several blocks with different displacement characteristics .The displacement for single block could be expressed by two variables:sliding and deformation displacement .The deformation displacement , which reflects itself soil strength , was regarded as the weight of weighted back analysis .And the new inversion objective function was presented .Finally, depending on entity project , this presented method was used to calculated soil strength which matched well with the test values . Meanwhile, the sensitivity result also indicated the effectiveness of the method .