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为了解决高岩面地质条件下基坑支护方案的选型及邻近地铁隧道保护措施的问题,本文提出了基于地层稳定性分析结果的基坑支护方案选型方法。通过一实际工程,介绍了地层稳定性分析的具体应用过程,并结合三维有限元分析方法,研究了采用吊脚桩支护下的基坑工程开挖对周边地铁隧道的影响问题。最后利用基坑施工过程中的监测数据及邻近地铁隧道监测数据,验证了本文所提出的地层稳定分析方法的可行性和高岩面地质条件下吊脚桩基坑支护方案对邻近地铁隧道保护的有效性。
In order to solve the problem of the selection of foundation pit supporting schemes and the protection measures of the adjacent subway tunnels under high rock surface geological conditions, this paper presents a method of pit supporting scheme selection based on the results of formation stability analysis. Through a practical project, the concrete application process of stratum stability analysis is introduced. Combined with the three-dimensional finite element analysis method, the influence of excavation on the surrounding metro tunnel with excavation under the hanging foot pile is studied. Finally, the monitoring data in the construction process of the foundation pit and the monitoring data of the subway tunnel in the vicinity are used to verify the feasibility of the stratum stability analysis method proposed in this paper and the feasibility of the supporting plan of the pylon footing for the protection of the adjacent subway tunnel under high rock surface geological conditions Effectiveness.