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为研究近距离相邻的深大基坑同步开挖的可行性以及实践中的关键技术措施,本文结合某工程案例采用有限元软件Midas对实际开挖工况进行了三维有限元计算,对支护系统的整体性状、围护桩的承载力及变形进行了详细分析,并与监测数据相比较,得出了若干结论,可供类似项目参考:(1)在合理安排施工况的前提下,相邻基坑同步开挖是技术可行的;(2)实施过程中,除确保围护结构的承载力和变形应满足相应要求外,在施工过程中还应防止两个基坑所夹持的中间土体的流失,确保支撑体系的传力连续。
In order to study the feasibility of synchronous excavation of the deep foundation pit adjacent to each other and the key technical measures in practice, this paper combines the finite element software Midas with a project case to carry out the three-dimensional finite element calculation of the actual excavation condition, The overall characters of the protection system, the bearing capacity and deformation of the retaining pile are analyzed in detail, and compared with the monitoring data, a number of conclusions can be drawn for reference of similar projects: (1) Under the reasonable arrangement of construction conditions, (2) In the process of implementation, in addition to ensure that the bearing capacity and deformation of the envelope should meet the corresponding requirements, during the construction process should also prevent the two pit held by the The loss of soil in the middle to ensure that the supporting system of continuous force transmission.