以京张城际铁路八达岭超大规模地下车站修建为例,依据工程区水文地质特征、水压致裂原地应力测量结果,利用有限差分软件FLAC3D建立三维渗流应力耦合模型,采用全封堵、全排水、非耦合、注浆限排4种方案进行数值模拟结合理论分析,着重研究在饱水状况下八达岭车站修建前后的渗流场变化、涌水量、围岩变形和地表沉降等环境影响负效应因子,对因地下车站修建环境影响效应的显著性、空间分布特征和长期效应进行评价.模拟计算结果对于裂隙发育、富水地层地下工程尤其自然风景区大型地下洞室防排水设计和施工具有指导意义.%In order to access the environmental effects of Badaling underground station project, numerical analyses for the stability of surrounding rock were done with fast Lagrangian analysis of continue in thrcc-dirnension(FLAC3D). Multiple factors were considcred including surrounding rock classes, tunnel depths, groundwater tables, construction methods and initial supporting systems. The models were divided into four classes which included the exclusion of underground water model, model with underground water seepage flow, model without underground water seepage flow, and a coupling analysis model with grouting reinforcement. According to the results of the displacement of rock mass, the pore pressure distribution and water gushing capacity, the significance, spatial distribution and long-term effects of environmental effects were discussed and the degree of influence were studied as well. The achieved results can successfully applied to the guidance of the tunnel construction for waterproofing of underground station. Furthermore, the study results can provide a theoretical basis for the design of tunnel and underground works in aquifer strata.
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