基于三维地质模型分析的深基坑支护应用研究

Study on the application of retaining and protection for excavations based on three-dimensional geological model analysis

三维地质建模在地下工程、地下空间管理等行业中均有很大的应用潜力。本文利用南宁市砂层、圆砾层三维地质模型,结合一个深基坑支护工程实例,首先对围护结构选型进行了研究和分析,再结合三维地质模型对地下水位、圆砾层抗剪强度、黏聚力和内摩擦角等指标进行了确定,最后运用理正深基坑协同计算软件进行了基坑支护空间结构的模拟计算分析。根据监测报告,基坑变形、支撑内力等均满足设计要求,证明了三维地质模型分析在类似基坑支护设计项目中有一定的参考应用价值。

Three-dimensional geological modeling has a large number of applications in underground engineering,underground space management and other industries. Based on the three-dimensional geological model of sand and gravel beds in Nanning,taking a deep foundation pit support project as an example,the selection of the retaining structure is studied. The indexes such as the underground water level,the shear strength of the round gravel layer,the cohesion and internal friction angle are determined by combining with the three-dimensional geological model. The spatial structure of the foundation pit support is simulated and analyzed by using Lizheng deep foundation pit collaborative computing software.According to the monitoring report,the deformation of foundation pit and the internal force of the support all meet the design requirements. It is shown that the analysis of three-dimensional geological model has certain reference value in the design of foundation pit support for similar projects.