边坡加权位移反演方法及工程应用研究

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。

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

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.