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以盘锦渤海路地下商业街基坑工程为背景,应用FLAC3D数值计算软件对基坑开挖的全过程进模拟分析。通过对比计算结果和监测数据,总结了盘锦地区基坑的围护结构变形及周围地表沉降变形特征。分析结果表明:对于盘锦地区的土层条件,使用Mohr-Coulomb模型比较合理,且模拟过程中需要设置接触面考虑桩-土相互作用;该地区基坑开挖对周围环境的主要影响区为2H(H为基坑开挖深度),次要影响区为2~4H。数值模拟结果还表明,虽然数值模拟中难以精确考虑底板的作用,但计算结果显示基坑底板对约束围护结构变形有很重要的作用。
Taking the construction of underground commercial underground tunnel in Panjin Bohai Sea as background, the whole process of foundation pit excavation was simulated by FLAC3D numerical calculation software. By comparing the calculation results with the monitoring data, the deformation of the retaining structure and surrounding ground settlement deformation of the foundation pit in Panjin area are summarized. The analysis results show that the Mohr-Coulomb model is reasonable for the soil conditions in Panjin, and the contact surface needs to be set up to consider the pile-soil interaction during the simulation. The main influence area of excavation on the surrounding environment in this area is 2H (H for excavation depth), the secondary impact area is 2 ~ 4H. The numerical results also show that although it is difficult to accurately consider the effect of floor in numerical simulation, the calculation results show that the floor of foundation pit plays an important role in the deformation of the confining enclosure.