饱和粉土地区土钉墙支护问题处理

Treatment of Soil Nailing Wall Support in Saturated Silt Area

在饱和粉土地层进行基坑开挖支护工程,由于基坑降水短期内难以排出粉土层内积水,在开挖支护过程中,粉土地层经常出现流水、流砂、坍塌等问题,对基坑安全造成一定影响,因此在遇到此类地层时,应从设计、施工角度重点考虑,提前采取应对措施,以保证基坑安全。论文以某工程为例,采用土钉墙支护,在饱和粉土层位置出现典型的流水、流砂、局部坍塌以及帷幕漏水问题,采取微型桩超前支护、轻型井点降水、砂袋、松木桩、注浆等措施,有效解决了以上问题,保证了基坑及周边环境安全。

Carry out foundation pit excavation and support works in saturated silt layer,Due to the difficulty in draining accumulated water in the silt layer during foundation pit dewatering in a short period of time,During excavation and support,Problems such as flowing water,quicksand,and collapse often occur in silty soil layers,Which has a certain impact on the safety of the foundation pit,Therefore,when encountering such strata,Emphasis should be placed on design and construction,Take countermeasures in advance to ensure the safety of the foundation pit.In this project,soil nailing wall support is adopted,and typical problems such as flowing water,quicksand,local collapse,and curtain water leakage occur at the saturated silt layer.Measures such as micropile advanced support,light well point precipitation,sand bags,pine piles,and grouting are taken to effectively solve the above problems and ensure the safety of the foundation pit and surrounding environment.