淤泥土质深基坑支护方案比选研究

Comparison and Selection of Support Schemes for Deep Foundation Pits in Muddy Soil

本课题以滨海淤泥质地基为背景,以连云港-镇江连镇高铁灌云站综合客运枢纽前广场地下停车站为研究对象,以滨海淤泥性地层为主要特征,在设计无明确支护方式下以及汛期必然要迅速进行全线支护施工的难点问题,通过比较分析各种支护的安全性与经济性,提出了一种基于滨海泥土层的深基坑支护施工方法。确定了合理的支撑方式。研究成果显示,东侧连通通道采用拉森钢板桩+型钢支撑的形式,基坑东侧采用放坡开挖,坡面设置钢板桩体系,基坑西侧采用桩锚支护体系,支护桩采用600mm管桩,锚杆采用预应力锚索系统,保证了基坑稳定性、经济高效的完成了施工任务。

This project takes the coastal muddy foundation as the background,and takes the underground parking station in front of the comprehensive passenger transportation hub of Guanyun Station on the Lianyungang Zhenjiang Lianzhen high-speed railway as the research object.The main feature is the coastal muddy strata.In the absence of clear support methods in the design and the difficulty of rapid full line support construction during flood season,a deep foundation pit support construction method based on the coastal soil layer is proposed by comparing and analyzing the safety and economy of various supports.A reasonable support method has been determined.The research results show that the connecting channel on the east side adopts the form of Larsen steel sheet piles and shaped steel supports.The east side of the foundation pit adopts slope excavation,with a steel sheet pile system set on the slope surface.The west side of the foundation pit adopts a pile anchor support system,with 600mm pipe piles and pre-stressed anchor cables used for the support piles.This ensures the stability of the foundation pit and completes the construction task economically and efficiently.