柔性面层土钉墙室内模型试验研究

LABORATORY MODEL TESTS OF SOIL NAILING WALLS WITH GEOTEXTILE FACING

通过模型试验开展不同刚度面层土钉墙作用机理的研究,结果表明：土钉轴向应变呈＂中间大、两边小＂的分布规律,但柔性面层土钉墙土钉轴向应变值在主动区内明显小于传统面层土钉墙土钉的应变值;柔性面层土钉墙潜在滑裂面在基坑中下部有明显向后扩张的趋势;随着荷载的增大,基坑面层水平位移存在＂中部大、两头小＂的规律,反映在基坑支护设计上,如果基坑旁有附加荷载时,采用柔性面层土钉墙应加长土钉墙中部土钉的长度。

A research on the mechanism of soil nailing walls with different stiffness facing conducted through model tests. The results showed that the axial strain of soil nailing were large at both ends and small in the middle,but the soil nailing axial strain of soil nailing walls with geotextile facing were much smaller than that with traditional facing in the active region; the potential sliding surface of the soil nailing walls with geotextile facing in the lower part of the foundation excavation had a significant tendency to expand backward. With the increase of the loads,the horizontal displacements of the facing for the soil nailing wall were large in the middle and small at both ends,which mainly reflected in the design of foundation excavation supporting,if there were additional loads adjacent to the foundation excavation,the soil nailings in the central of the soil nailing wall should be lengthened.