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工程实践表明狭窄基坑的稳定性更好,所需要的围护结构入土深度也更小。目前常用的计算方法并没有考虑基坑宽度对抗隆起稳定性的有利影响。给出了狭窄基坑的分类条件,在现行规范的基础上,提出了一种狭窄基坑抗隆起稳定性的计算方法,并采用强度折减有限元法进行论证。分析了基坑宽度及插入比对抗隆起稳定性的影响,提出对应于某确定的抗隆起稳定安全系数,狭窄基坑围护结构可采用更小的入土深度。然后采用该方法对已实施的某狭窄基坑抗隆起稳定性进行了验证,结果表明本方法具有推广价值。
Engineering practice shows that the stability of narrow foundation pit is better, and the required envelope structure is smaller in depth. The commonly used calculation method does not consider the favorable effect of the width of foundation pit against the stability of the bump. The classification conditions of narrow foundation pit are given. Based on the existing codes, a method for calculating the anti-swelling stability of narrow foundation pit is proposed. The strength reduction finite element method is used to demonstrate the method. The influence of the width of foundation pit and insertion ratio on the stability of anti-raising is analyzed. Corresponding to a certain safety factor of anti-raising, a smaller depth of penetration into the supporting structure of narrow foundation pit can be used. Then, this method is used to verify the anti-swelling stability of a narrow foundation pit. The results show that this method has the promotion value.