大型泵房沉井在深厚软土层中的下沉控制应用研究

Application Research of Sinking Control of Large Pump House Open Caisson in Deep Thick Soft Soil Layer

某大型火力发电厂的循环水泵房沉井位于软弱土层上,软土层厚度达到了20~30 m,采用刃脚下施打水泥搅拌桩控制沉井下沉,沉井外壁附近施打水泥搅拌桩防止井内涌水涌泥;泵房地基处理采用管桩刚性地基处理方案,同时采用格构式水泥搅拌桩保护管桩基础。文章对深厚软土层中的大型泵房沉井设计和下沉控制进行了详细介绍,可对类似工程设计和施工提供参考和借鉴。

Circulating water pump house open caisson of a larger thermal power plant is built on a 20 ~ 30 m depth soft soil layer.Use cement mixing piles under the blade feet for controlling open caisson sinking,and pile cement mixing piles around the open caisson in case water and mud flow into the open caisson.Pump room ground treatment uses rigid pipe pile foundation treatment scheme,at the same time,uses lattice type cement mixing pile to protect pipe pile foundation.This paper introduces the design of large pump house open caisson and controlling sinking in deep soft soil layer in details.It could provide a reference for similar engineering and construction.