Back analysis for hydrogeologic parameters of aquitard at Tianjin railway station
The aquitards, confined and unconfined aquifers are often dewatered together in deep excavation. The hydraulic connection among the aquifers has a great effect on the dewatering efficiency. While the conventional pumping tests scarcely focus on the hydraulic connection. The pumping test focused on the hydraulic connection between the phreatic aquifer and the confined aquifer was implemented at plaza before the station. The aquifers of pumping test are phreatic aquifer and confined aquifer. The test have 2 fully penetrating wells, 5 observation holes, 12 pore pressure gauges and 3 stress periods. The monitoring data reveal the response of the water level in each aquifer and the aquitard over all during the test. After data preprocessing, Modflow, a ground-water flow model program , was applied to numerical simulate and back analyze the pumping tests process. The results of the numerical simulation fit well with the observed data. The estimated hydrogeologic parameters for the phreatic aquifer, confined aquifer and the aquitard derived from back calculation are of high reliability. The hydrogeologic parameters can be used to quantitative analysis for the hydraulic connection among the aquifers and the aquitard.
aquitard pumping tests hydraulic connection hydrogeologic parameters numerical back analysis
Yang Jianmin Zheng Gang
Department of Civil Engineering, Key Laboratory of Coast Civil Structure Safety Tianjin University Tianjin, China
国际会议
三峡
英文
587-592
2012-05-18（万方平台首次上网日期，不代表论文的发表时间）