一种基于强度折减法的刚性桩复合地基整体稳定性评价方法研究

发布时间：2018-04-18 03:26

本文选题：强度折减法 + 复合地基　；参考：《岩土力学》2017年03期

【摘要】：当前在评价复合地基稳定性时通常采用极限平衡法进行分析,即采用复合地基理论,把刚性桩的黏结力和摩擦角等效为地基整体的黏聚力和内摩擦角,然后采用圆弧条分法计算其整体安全系数。显然,该计算方法假定了桩体与土体皆发生剪切破坏。但相关研究成果表明,群桩中存在多种破坏模式,单纯采用剪切破坏模式计算出的安全系数可能偏安全。从刚性群桩的实际破坏模式出发,提出一种适用于刚性桩破坏特征的强度折减法,即通过强度折减法搜索复合地基系统的临界状态时,刚性桩的破坏模式应符合实际破坏情况。同时,根据刚性桩的变形破坏特征,探讨强度折减法临界状态判别方法,通过算例比较只折减抗剪切强度参数和笔者所提方法的差异,验证了本文方法的可行性和合理性。
[Abstract]:At present, the limit equilibrium method is usually used to evaluate the stability of composite foundation, that is, the bond force and friction angle of rigid pile are equivalent to the cohesive force and internal friction angle of the whole foundation by using the theory of composite foundation.Then the integral safety factor is calculated by using the circular arc strip method.Obviously, this method assumes shear failure of both pile and soil.However, the related research results show that there are many failure modes in pile groups, and the safety factor calculated by simply using shear failure mode may be relatively safe.Based on the actual failure mode of rigid pile group, a strength reduction method suitable for the failure characteristics of rigid pile is put forward, that is, when the critical state of composite foundation system is searched by strength reduction method, the failure mode of rigid pile should accord with the actual failure situation.At the same time, according to the deformation and failure characteristics of rigid pile, the critical state discrimination method of strength reduction method is discussed. The feasibility and rationality of this method are verified by comparing the difference between the parameters of only reduced shear strength and the method proposed by the author.
【作者单位】：东南大学岩土工程研究所;江苏省城市地下工程与环境安全重点实验室;安徽大学资源与环境工程学院;
【基金】：国家自然科学基金(No.41330641);国家自然科学基金(No.51279032)~~
【分类号】：TU470

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