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摘要: 在天津滨海新区中新生态城服务中心开展了承压含水层抽水引起地面沉降的现场试验，采用振弦式孔隙水压力传感器和一孔多标数据采集器实时监测孔隙水压力和分层标的变化，分析了土体的变形性质和分层沉降的规律。试验结果表明，黏土层变形明显滞后于承压含水层水位的变化，以塑性变形为主且存在蠕变现象，而砂层既存在弹性变形，也存在一定的塑性变形和蠕变性。短期抽取地下水会使抽水井附近承压含水层上覆土体出现上小下大的沉降规律，且最大沉降出现在有明显孔隙水压力变化的土层顶板位置。Abstract: In-situ test of land subsidence caused by pumping in an confined aquifer was carried out at the new eco-city service center in the Tianjin Binhai New Area. The vibrating wire type pore water pressure sensor and multi-marks data taker system in one hole were used to monitor the changes in pore water pressure and subsidence in real time. The deformation properties of soil and the law of stratified settlement were analyzed. The test results show that the deformation of the clay layer obviously lags behind the change in water level in the confined aquifer, which has mainly the plastic deformation and creep phenomenon. The sand layer has not only elastic deformation, but also some plastic deformation and creep. The short-term extraction of groundwater will make the settlement of soils overly the confined aquifer and gradually increase from top to bottom near the pumping well, and the maximum settlement occurs at the top of the soil layer which has an obvious change in pore water pressure.
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