临水船闸基坑水泥土搅拌桩施工对围堰的影响

临水船闸基坑由于需要提供坑内较大作业空间而较多地采用重力式水泥土搅拌桩作为支护结构,基坑外侧常采用钢板桩作为临时的挡水围堰。针对水泥土搅拌桩施工过程对钢板桩围堰产生位移过大的问题,以某船闸基坑为例,采用数值模拟与现场监测数据相结合的方法研究搅拌桩施工过程中对于钢板桩临时围堰的影响,分析钢板桩围堰变形过大的原因。通过现场孔隙水压力试验得出搅拌桩施工过程中土体孔压在深度和宽度上的变化规律和水泥土搅拌桩施工对周围土体的影响范围,并提出一种钢板桩围堰变形过大的解决方案。本研究可为类似基坑的设计和施工提供借鉴。

Influence of cement soil mixing pile construction on cofferdam of ship lock foundation pit adjacent to water

Due to the need to provide a larger working space in the pit of the ship lock near the water,the cement mixing pile is often used as the supporting structure.Steel sheet piles are mostly used as temporary water-retaining cofferdams outside the foundation pit.Taking the foundation pit of a ship lock as an example,we analyze the influence of temporary mixing cofferdams on steel sheet piles during the construction of cement mixing,and obtain the variation law of soil pore pressure during the construction of mixing piles through the field pore water pressure test,based on which a solution for excessive deformation of the cofferdam is proposed.According to the field pore water pressure test,we obtain the variation law of soil pore pressure in the depth and width of the mixing pile construction process and the influence range of the cement soil mixing pile construction on the surrounding,and propose a solution for the excessive deformation of steel sheet pile cofferdam.This study can provide a reference for the design and construction of similar foundation pits.