【作者】 张建山；

【导师】 仵彦卿；

【作者基本信息】 西安理工大学 ， 岩土工程， 2005， 博士

【摘要】 由基坑抽水引起的建筑物周围地面沉降和地基沉降问题,已成为城市建设中的重大环境灾害问题之一。 抽水对含水层的影响不仅仅是引起含水层的压缩,而且有表征体元的垂向位移和水平位移;当考虑变形对渗流场的影响时,应考虑表征体元的位移对渗流方程的影响和变形对渗透系数的影响;通过理论分析推导出了考虑表征体元位移的渗流方程;通过算例,对考虑单元体位移和不考虑单元体位移对渗流的影响进行了分析。当考虑变形对渗流场的影响时,特别是当弹性释水系数较小时,单元体的位移对渗流场有较大影响。 对于承压含水层单井抽水引起的颗粒运动问题,以土体渗流场与应力场相互影响、相互作用的耦合机理为基础,建立了含水层中颗粒运动的数学模型及其解析解,提出了颗粒运动函数的概念,通过颗粒位移量函数绘制出了单井抽水引起含水层颗粒运动变化曲线。从曲线可看出,当抽水井井壁无颗粒逸出时,颗粒位移量的最大值并不在井壁处,而且随着抽水的延续,其最大值点也逐渐增大并向远离井周的方向推移。应用该理论对一些用现有固结更多还原

【Abstract】 The confined aquifer system responds to fluid withdrawal as adynamic unit whose elemental volumes not only compress due to decrease inporosity but move horzoontally and vertically in order for the system to remain contiguous. When that consideration transform to influence seepage field, should consider the unit to move to influence seepage field and transform to influence hydraulic conductivity, This paper passes the theories analysis to deduce out to the seepage equation for the unit moving, and through a example study the influence to seepage field with consideration unit move and taking no account of unit move.This paper subsides for Skeletal Movement problem due to groundwater withdrawal, it is foundation to the mutual influence of seepage with stress and the couple mechanism of interaction, make a new mathematical model of skeletal movement in confined aquifer. Inspect fitness for purpose and the validity of this mathematics model with example.Based on the mechanism analysis of land subsidence from groundwater pumping in foundation pit, a formula for account of land subsidence was presented. Through case study and analysis of alternative plans, a variety ofpreventing measures were proposed due to groundwater withdrawal and applicability to preventing measures of land subsidence were analyzed.更多还原