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城市地区密集的基坑群施工中,有时会遇上两个甚至多个基坑在同一时期进行开挖施工的情况。相邻基坑开挖的失效机理、破坏模式与基坑单独开挖存在较大的差异,目前尚缺乏考虑相邻基坑开挖的基坑失效机理和破坏模式研究。以某实际相邻双基坑工程为原型,利用Rockscience Phase2有限元软件建立相邻基坑开挖的二维模型,采用应变剪切带判别基坑破坏模式,采用强度折减法分析基坑稳定性,探讨影响相邻基坑稳定性的主要因素。结果表明:相邻基坑破坏模式主要表现为上部倾覆破坏或下部滑移破坏或两者组合破坏形式。开挖深度、基坑间距、锚杆长度、支护桩嵌固深度、土体强度、支护方式和软土层厚度等对相邻基坑破坏模式产生明显的影响。
During the construction of dense foundation pit groups in urban areas, sometimes two or more foundation pit excavations are carried out in the same period. There is a big difference between the failure mechanism and the excavation mode of the adjacent excavation and the excavation of the excavation alone. At present, the failure mechanism and failure mode of the excavation considering the excavation of the adjacent excavation are still lacking. Based on an actual adjacent double foundation pit project, a two-dimensional model of excavation of adjacent excavation was set up by using Rockscience Phase2 finite element software, and the failure mode of foundation pit was determined by using strain shear zone. The stability of foundation pit was analyzed by using strength reduction method , To explore the main factors affecting the stability of the adjacent pit. The results show that the failure modes of the adjacent excavation are mainly the overturning of the upper part or the descending slip or the combination of the two. Excavation depth, pit spacing, length of anchor, embedment depth of supporting pile, strength of soil body, supporting method and thickness of soft soil layer have a significant impact on the failure mode of adjacent foundation pit.