复合土钉支护结构中土钉设置的合理型式

采用非线性有限元方法,并借助正交试验原理,以支护最大水平位移为衡量目标,对复合土钉墙设计中的关键技术———土钉设置型式,包括倾角、间距、长度分布规律进行了合理性方面的研究。研究表明:将最长的土钉放于基坑中下部、保持较小的土钉间距和增大基坑中下部土钉倾角是复合土钉支护中土钉设置的最佳型式;在影响基坑变形敏感性程度上,土钉长度分布规律、间距、倾角依次降低。

Research on reasonable setting of soil-nail in composite soil-nailed retaining wall

Nonlinear analysis of FEM and orthogonal test are applied to study on the reasonable setting of soil-nail in composite soil-nailed retaining wall aiming at horizontal maximum displacement of the wall. The problem involves soil nail obliquity, spacing, length distribution. The results indicate that the longest soil nail settled in middle or low location of wall,smaller spacing of soil nail and larger obliquity of soil nail are the best style of soil nail design. When it comes to sensitive degree on pit deformation, length distribution is the first, and soil nail spacing, obliquity follows. These results can help to make good knowledge of the work function of composite soil-nailed retaining wall and bring out reasonable design thoughts.