上海某深基坑降水抽水试验研究
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摘要
以上海某深基坑工程为依托,设计单井抽水试验,对降水过程中C08抽水井的出水量以及各观测井的水位进行观测,得到出水量变化先由4.32m~3/h下降到2.82m~3/h再保持稳定的规律;观测井内水位在降水开始后急速下降,降水结束后在较短时间内恢复到初始水位,距离降水井距离越近则其水位变化越大;对试验所得数据进行拟合分析得到混合水平渗透系数K为2.25×10~(-4)cm/s,导水系数T为3.08×10~(-1)cm~2/s,储水系数S平均值为1.66×10~(-3),并提出⑤_1/⑤_2层的混合垂直渗透系数参考值为4.0×10~(-5)cm/s。
Based on a deep foundation pit project in Shanghai, a single well pumping test was designed to observe the water output of C08 pumping well and the water level of each observation well in the precipitation process. The change of water output firstly decreased from 4.32 m3/h to 2.82 m3/h and then maintained a stable rule. The water level in the observed well drops rapidly after the precipitation begins, and returns to the initial water level in a short time after the precipitation ends. The closer the water level is to the precipitation well, the greater the water level change will be. Get mixed fitting analysis made on the test data from horizontal permeability coefficient K of 2.25×10~(-4)cm/s, water conductivity of 3.08×10~(-1)cm~2/s, storage coefficients average of 1.66×10~(-3), put forward the ⑤1/⑤2 hybrid vertical permeability coefficient reference for the layer 4.0×10~(-5) cm/s.
Based on a deep foundation pit project in Shanghai, a single well pumping test was designed to observe the water output of C08 pumping well and the water level of each observation well in the precipitation process. The change of water output firstly decreased from 4.32 m3/h to 2.82 m3/h and then maintained a stable rule. The water level in the observed well drops rapidly after the precipitation begins, and returns to the initial water level in a short time after the precipitation ends. The closer the water level is to the precipitation well, the greater the water level change will be. Get mixed fitting analysis made on the test data from horizontal permeability coefficient K of 2.25×10~(-4)cm/s, water conductivity of 3.08×10~(-1)cm~2/s, storage coefficients average of 1.66×10~(-3), put forward the ⑤1/⑤2 hybrid vertical permeability coefficient reference for the layer 4.0×10~(-5) cm/s.
引文
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