饱和软土深基坑开挖中的主要岩土工程问题——以汉口地区软土为例

Main Geotechnical Engineering Problems in Deep Foundation Pit Excavation in Saturated Soft Soil

以汉口地区软土为例,分析了饱和软土深基坑开挖中遇到的主要岩土工程问题:边坡土体和支护结构变形、基底隆起或整体失稳;上层滞水或潜水引起侧壁涌水和流土,或承压水坑底管涌和冒砂;基坑周边地面(或地下)的变形。在分析该类问题产生原因及破坏后果的基础上,提出在软土地基设计时,应充分考虑支护结构、嵌入深度以及止水方案。

To take the soft soil in Hankou area as an example, the paper analyzed main geotechnical problems in deep foundation pit excavation in saturated soft soil： slope mass and supporting frame distortion, floor heave or en bloc instability; side wall water inrush and soil flow caused by perched water or phreatic water;, confined water caused pit bottom piping and quicksand; foundation pit peripheral surface （or underground） distortion. Analyzed causations and aftermath, put forward supporting frame, embedding depth and water sealing schemes have to be sufficiently considered in soft soil foundation design.