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抽水引起地层压缩和地面沉降已成为工程建设的环境灾害问题。研究表明土体的压缩变形主要来自于弱透水层及含水层中的弱透水夹层,本文在Terzaghi一维固结理论和地下水渗流理论的基础上,结合弱透水夹层的延迟释水时间参数,利用地下水模拟程序MODFLOW配合SUB沉降模块建立地下水渗流—地层压缩模型,进行了含有弱透水层地层的含水系统的沉降模拟,分析夹层滞后疏水过程中带来的沉降滞后效应,并对夹层中的四个关键影响参数(弹性贮水率S’_(ske)、非弹性贮水率S’_(skv)、预固结水头值HC以及垂向水力传导系数K’_v)进行敏感性分析,模拟研究结果可为降水型地面沉降的防治提供科学依据。
Pumping caused by formation compression and land subsidence has become a project construction environmental disaster. The study shows that the compressive deformation of soil mainly comes from the weak aquitard and aquitard impermeable interlayer. Based on Terzaghi one-dimensional consolidation theory and groundwater seepage theory, combined with the delay water release time parameters of weakly permeable interlayer, Groundwater simulation program MODFLOW with subsidence module to establish groundwater seepage - formation compression model, carried out the aquifer system with impermeable aquifer strata sedimentation simulation, analysis of the lag lag effect of the settlement lag caused by the settlement, and the sandwich in the four The key influencing parameters (elastic water rate S ’ske, non-elastic water storage S’ sksk, preconsolidation head HC and vertical hydraulic conductivity K’_v) were analyzed for sensitivity and simulation The results can provide a scientific basis for the prevention and control of precipitation land subsidence.