某重力式码头基槽开挖支护方案比选及应用效果

Comparison and selection of supporting scheme for foundation trench excavation of a gravity wharf and application effects

针对重力式码头基槽开挖对相邻工程设施的安全稳定问题,以粤西某码头工程为例,通过多种支护方案比选分析,优选注浆微型钢管桩支护结构。理论计算结果及现场实践表明采用多排注浆微型钢管桩作为支护结构是可行的。通过压力注浆的“联结效应”形成整体结构,利用植入钢管的强度提供抗力,较好解决了基槽开挖对相邻已建护岸的影响。

In view of the safety and stability problems caused by the foundation trench excavation of gravity wharves to the adjacent engineering facilities,this paper takes a wharf project in western Guangdong as an example and selects the grouting micro-steel-pipe pile as the supporting structure through comparison and analysis of various supporting schemes.The results of theoretical calculation and field practice indicate that it is feasible to adopt multi-row grouting micro-steel-pipe piles as the supporting structure.The whole structure is formed through the“coupling effect”of pressure grouting,and the strength of implanted steel pipes is used to provide resistance,which can satisfactorily eliminate the influence of foundation trench excavation on the adjacent built revetment.