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针对整体滑动稳定性满足规范要求的部分刚性桩复合地基路基发生滑塌的现实,分析了刚性桩复合地基路基可能的破坏模式,指出桩间荷载较大且桩间土软弱时可能会发生绕流滑动破坏,对刚性桩复合地基路基建议同时进行整体滑动稳定分析、绕流滑动稳定性分析和毁桩验算等。分析了刚性桩对滑动体的作用力并给出了相应的计算方法,通过对路堤荷载进行折减处理以及将桩周摩擦力转换至加固区地基土重度等措施,提出了绕流滑动稳定分析简化方法。工程实例表明,该方法合理可行。基于刚性桩复合地基路基绕流滑动稳定分析,对路基下刚性桩复合地基设计提出了建议。
In view of the fact that part of the rigid-pile composite foundation with slip of the whole sliding stability meets the specification requirements, the possible failure mode of the subgrade with rigid-pile composite foundation is analyzed. It is pointed out that the flow around the pile may be larger when the inter- Slipping and destroying. It is suggested to analyze the sliding stability of the rigid pile composite foundation at the same time, analyze the stability of the flow around the flow and check the destroyed pile. The force of the rigid pile to the sliding body is analyzed and the corresponding calculation method is given. By means of reducing the load on the embankment and converting the friction of the pile to the weight of the foundation soil in the reinforcement zone, the stability analysis of the flow around the sliding body is proposed Simplify the method. The engineering example shows that this method is reasonable and feasible. Based on the stability analysis of the flow around the rigid-walled composite foundation, the design of the composite foundation of the rigid pile under the subgrade is put forward.