穿越采空区桥隧工程危害效应分析及对策

青岛-银川高速公路的康家沟大桥与庙梁隧道下伏康家沟煤矿采空区,为确保桥隧工程的安全,基于MIDAS/GTS有限元程序构建了FLAC3D三维计算模型,对分期采矿形成地下采空区进行注浆处治,对桥隧工程施工过程中地表变形响应、隧道初衬结构、桥梁和墩台的变形及受力特征等进行数值模拟分析,揭示了不同工况条件下的地表变形程度,确定了地表沉陷盆地特征,对隧道初衬结构和桥梁墩台进行了变形和受力关键部位的预测分析,并提出了有效工程对策.研究成果对指导类似桥隧工程设计和施工有重要指导意义.

Numerical analysis of hazard effects and protection measuresof highway tunnel and bridge crossing mined-out regions

The Kangjiago u mined-out regions are under the Kangjiago u bridg e and Miaoliang tunnel projectin Liul in section of Qing dao-Yinchuan hig hw ay . In order to ensure the project safety, the three-dimensionalcomputat ion models w ere built using the MIDAS/ GTS f inite element progr am, and numerical simulationanaly ses of the g round deformat io n response, and the tunnel lining and the bridge st ructural deformationas w ell as their st ructural force using FLAC3D w ere performed. T he pr ocesses were generated in the stepby-step mining region for the t reatment after mining coal in Kangjiagou. The double-layered Miaoliangtunnels w ere ex cavated and Kang jiag ou bridg e w as co nstr ucted. T he surface deformat io ns under differentw orking condit ions w ere rev ealed, and the ground subsidence basin char acterist ics and the cent ral subsidenceposition w ere determined. Besides, the defo rmat io ns and fo rces of key bear ing part s o f the tunnellining and the bridge were predicted, then the co rresponding countermeasures and sug gest ion w ere given.The r esult s are o f great importance to the design and const ruct ion o f similar bridges and tunnels.