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结合观澜河调蓄池基坑的实例,采用Bishop法进行基坑“吊脚桩”支护刚体极限平衡稳定性分析,分析了基坑在未进行加固前、支护桩加固以及在桩锚支护完全加固完成后的最危险滑动面和安全系数,研究了支护桩预留岩肩宽度的影响。结果表明:桩锚完全支护后安全系数为1.470,分别比未进行加固前和支护桩加固后增加0.607和0.375,该深基坑采用的加固措施效果明显,满足规范要求,因此,该基坑采用的“吊脚桩”支护结构的支护方案是合理的;预留岩肩宽度越大,安全系数越大,当该宽度大于1.2m时,其变化对安全系数影响作用将不再明显,因此,该基坑所采用的预留岩肩宽度为1.2m也是合理的。
According to the example of foundation pit of Guanlan River, the Bishop method was used to analyze the stability analysis of the limit equilibrium of the rigid foundation with “Hanging foot” support. Before the foundation pit was strengthened, The most dangerous slip surface and safety factor after complete reinforcement of the anchor support are studied. The influence of the reserved rock shoulder width of the retaining pile is studied. The results show that the safety factor after full support of pile and anchor is 1.470, which increases by 0.607 and 0.375 respectively before reinforcement and without support pile, and the reinforcement measures adopted by the deep foundation pit are obviously effective and meet the requirements of the code. Therefore, The supporting plan of “hanging foot pile” support structure used in pit is reasonable; the bigger the width of reserved rock shoulder is, the bigger the safety factor is, and when the width is more than 1.2m, the change will affect the safety factor No longer apparent, so it is reasonable to reserve a reserved rock shoulder width of 1.2 m for this foundation pit.