搅拌桩加固挡土墙基底软土相关参数探讨

以常熟市三环快速化改造工程为依托,对搅拌桩加固挡土墙基底软土的桩长及桩间距的选定进行了分析。结果表明:增加搅拌桩桩长对控制路段沉降是有利的,但当搅拌桩桩长达到临界长度后,地基承载力不再随桩长的增加而增加;在工程实践中,搅拌桩的桩长一般都大于临界值,故在桩径一定的情况下,为提高地基承载力,可缩小桩间距。

Discussion on the Related Parameters of Mixing Piles for Reinforcing the Soft Soil Ground under the Retaining Wall

Based on the rapid reconstruction project at the third ring road in Changshu, the pile length and pile spacing are analyzed and selected when the mixing piles are used to strengthen the soft soil ground under the retaining wall. The results show that, the increase of the pile length is beneficial to control the subgrade settlement, but when the length of the pile reaches the critical length, the subgrade bearing capacity will not be increased as the pile length is increased. In engineering practice, the length of the mixing pile is usually greater than the critical value, and thus the pile spacing can be reduced to get better subgrade bearing capacity under the condition that the pile diameter is fixed.