软土基坑抗隆起稳定性的改进圆弧滑动法 English Version
Improved circular arc sliding method for basal heave stability of braced excavations in soft soil
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摘要: 大量软土基坑工程实践表明，当挡土构件插入比较小或较大时，采用现行规范圆弧滑动模式验算方法计算的基坑抗隆起稳定安全系数存在明显偏大的问题。基于极限分析有限元对现行规范方法存在的问题进行了深入剖析，揭示了抗隆起稳定安全系数、圆弧滑动半径、挡土构件提供的抗滑力矩随挡土构件插入比增加的变化机理，提出了挡土构件插入比上、下限值的计算公式。进一步对圆弧滑动半径、挡土构件提供的抗滑力矩进行修正，提出了改进的圆弧滑动模式验算方法。通过工程实例对比分析检验了改进方法的合理性。改进方法解决了现行规范方法存在的问题，可为深基坑支护结构设计及现行规范方法的修订提供有益的参考。Abstract: A large number of braced excavations in soft soil have shown that the safety factor of basal heave stability through the circular arc sliding method suggested by the current codes is too large when the insertion ratio of retaining structures is small or large. Based on the finite element limit analysis, the problems existing in the current codes are deeply investigated. The variation mechanism of the safety factor of basal heave stability, the circular arc sliding radius, and the anti-sliding moment of the retaining structures is clarified with the increase of the insertion ratio of the retaining structures. Calculation formulas for the upper and lower limits of the insertion ratio of the retaining structures is proposed. An improved circular arc sliding method for basal heave stability is proposed on the basis of modified circular arc sliding radius and the anti-sliding moment of the retaining structures. The rationality of the improved method is verified through a comparative analysis of engineering cases. The improved method has addressed the problems existing in the current codes, and may provide a beneficial reference for the design of retaining structures in deep braced excavations and the revision of current codes.
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期刊类型引用(4)
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百度学术
2. 易顺，潘家军，王艳丽，徐晗，白强强，杨志勇. 基坑地表沉降的偏态分布函数应用. 长江科学院院报. 2024(08): 135-141+179 . 百度学术
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4. 赵平，韩治勇. 深基坑开挖引起的地表竖向变形分析. 安徽科技学院学报. 2021(06): 112-118 . 百度学术
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