建筑荷载与地下水开采耦合作用对地面沉降的影响

Coupling effect of building load and groundwater extraction on ground settlement

以南通市海门区地面沉降历史为研究背景,从比奥固结理论出发,分析地面荷载及地下水渗流场对土体变形的影响.采用现场监测的方式对海门区地下水位、高层建筑物荷载和地面沉降进行监测,研究高层建筑荷载、地下水开采以及二者耦合作用对土体变形的影响.通过建立地下水渗流、建筑荷载与土体变形的三维流固全耦合模型,对不同因素作用下地面沉降进行模拟.模拟结果显示:地下水开采引发的地面沉降对主开采层的影响最大,建筑荷载引发的沉降对地表附近土体影响较大;地下水开采和建筑荷载的耦合作用引发土体变形的情况中,地面上距离建筑物集中区较近处以建筑荷载作用为主,较远处以地下水开采作用为主.

Taking the history of ground settlement in Haimen District,Nantong City as the research background,the influence of ground load and groundwater seepage field on soil deformation was investigated by Biot consolidation theory.The on-site monitoring method was used to monitor the groundwater level,high-rise building load and ground settlement in Haimen District,and the effects of the high-rise building load,groundwater extraction and the coupling effect of the two factors on the soil deformation were analyzed.The three-dimensional flow-solid full coupling model of groundwater seepage,building load and soil deformation was established by computer,and the simulation of ground settlement under the action of different factors was conducted.The simulation results show that the ground settlement caused by groundwater mining has the greatest impact on the main mining layer,and the settlement caused by building load has greater impact on the soil near the surface.The coupling effect of groundwater mining and building load causes soil deformation,and the effect of building load is dominant near to the building concentration area on the ground,while the effect of groundwater mining is dominant in the further away area.