软黏土基坑抗隆起稳定性研究

Study on basal heave stability of soft clay foundation

目前我国所采用的抗隆起稳定性计算忽略了支护结构底以下滑动区内土的重力对隆起的抵抗作用。基此,文章以福州某软土基坑为研究对象,对支护桩底未穿透软土层的基坑进行了抗隆起计算分析,并据计算分析结果提出新的计算方式。认为:在计算软土较厚的底层时,应充分考虑开挖一侧坑底滑动面以内土体重力对隆起的抵抗作用;开挖侧坑底滑动面以内土体的加固,可以对基坑隆起破坏起到一定的抵抗作用。

At present, the calculation of the basal heave stability in our country ignores the resistance of the earth＇s gravity to the heave in the sliding zone at the bottom of the supporting structure. In this paper, a soft soil foundation pit in Fuzhou was taken as the research object, and the heave resistance of the foundation pit with soft soil was analyzed. The results show that the resistance from soil weight of the inside sliding plane should be considered when we calculate a thicker bottom soil layer of the soft soil. Besides, the reinforcement of the inside sliding plane soil has a certain resistance to basal heave failure.