某地铁深基坑咬合桩止水技术研究

Study on the Water-stop Technology of the Secant Pile in a Metro Deep Foundation Pit

以成都某地铁站基坑工程为依托,进行基坑止水技术研究。该基坑紧邻锦江,基坑范围内地层卵石土层较厚,土层内赋存有大量的孔隙潜水,地下水径流发育,基坑开挖后对基坑危害较大。针对该基坑特殊的工程地质和水文地质条件,提出咬合桩止水技术的相关设计参数,通过对比分析、理论计算等方法,确定咬合桩的咬合量、桩径、插入深度等设计参数。

Based on the foundation pit project of a subway station in Chengdu,studies the water stop technology of foundation pit.The foundation pit is close to Jinjiang River.Within the scope of the foundation pit,the pebble soil layer is relatively thick,there is a large amount of pore phreatic water in the soil layer,and the groundwater runoff is developed.After the foundation pit is excavated,it will do great harm to the foundation pit.Aiming at the special engineering geological and hydrogeological conditions of the foundation pit,the purpose are put forward the relevant design parameters of the water stop technology of the bite pile.Through comparative analysis,theoretical calculation and other methods,the design parameters such as the bite amount,pile diameter and insertion depth of the bite pile are determined.