软弱土层基坑水泥搅拌桩止水帷幕失效分析

The Waterproof Curtain Failure Analysis of Cement Mixing Pile in Soft Soil Foundation Excavation

以广州市某基坑工程止水帷幕失效为背景,对软弱土层地质条件下的城市深基坑水泥搅拌桩止水帷幕失效原因进行了分析。土体中的有机质含量、固化剂的比例及桩体有效入土深度等因素对水泥搅拌桩的成桩质量和止水效果有较大影响。城市深基坑通常施工场地比较狭窄,基坑的支护结构、电梯井基坑、降水及其他工程对水泥搅拌桩的施工质量有时也会产生较大影响,因此应做好相应的设计和施工管理工作。

Based on the waterproof curtain failure of a foundation excavation in Guangzhou, the failure reasons of cement mixing pile waterproof curtain in soft soil geological conditions of deep foundation excavation in city are analyzed. The content of organic matter, soil curing agent ratio and pile effective depth affect the cement mixing pile quality and the water sealing result. Usually, the construction site of deep foundation excavation in city is quite narrow, the supporting structure, elevator excavation and foundation excavation dewater also affect the quality of cement mixing pile sometimes. The corresponding design and the construction management should be worked well.