软弱土层基坑土钉支护事故分析与处理

Accident Analysis and Treatment of Nailing Support Foundation Pit on Soft Soil Stratum

由于土钉支护墙对地层的依赖性很大,通常仅适用于地下水位低、自立性好的地层。在饱和粉质粘土、淤泥质粉质粘土、粉土等高水位的软土地层中,单纯的土钉墙不能满足基坑围护安全性,但土钉与其它支护结构共同作用,即复合土钉墙在软土地基中却能很好应用。对土钉墙施工,尤其在淤泥等软弱地质中应用,须保持高度谨慎,在认真进行实地调查与地质情况研究的基础上,不但要验算土钉墙本身安全系数,也要对土钉墙下卧层进行验算。

Soil nailing wall relies on the foundation to a large extend,so it is only suitable for the foundation with low underground water level and good independence.In soft soil stratum with high water level such as saturated silty clay,mucky silty clay,silty soil,pure soil nailing wall can not satisfy the safety of foundation pit support,but when the soil nails and other supporting structure interacts,the composite soil nailing wall in soft soil foundation can work well.During the construction of soil nailing wall,especially in the silt soft geological application and so on,a high degree of caution should be maintained,and both the safety factor of soil nailing wall itself and the substratum should be checked based on carefully filed survey and study of geological condition.