单井点和单排井点布置的真空降水现场试验及比较研究

发布时间：2018-04-30 07:42

本文选题：单井点 + 单排井点　；参考：《岩土力学》2014年02期

【摘要】：研究单井点和单排井点真空降水条件下,地层中地下水水位和抽水流量,在重力场和真空压力场耦合作用下的变化过程,并进行比较分析。试验表明,对于单井点排水条件,随着真空负压力和抽水井深度的增大,水位的下降有一定增加,而离开抽水井点较远处的水位下降更为明显。单排井点布置条件下,随着抽水井深度和抽水井间距的增大,无论是抽水井点布置方向还是垂直于抽水井点布置方向的地下水位的下降深度将有明显增大,而沿抽水井布置方向的水位下降深度更为显著。此外,在多次反复降水条件下,后续降水过程中地下水位的下降速率将有增快的趋势。试验还表明,抽水井井口的负压力小于真空泵出水口处的负压力,损失量可达12.5%,因此,在进行真空降水设计时需要考虑出水管道的长度。
[Abstract]:The variation process of groundwater level and pumping flow under the coupling of gravity field and vacuum pressure field under the condition of single well point and single row well point vacuum dewatering is studied and compared. The experimental results show that with the increase of the vacuum negative pressure and the depth of the pumping well, the water level decreases to a certain extent, but the water level from the pumping well point is more obvious than that from the far point. Under the condition of single row well point arrangement, with the increase of pumping well depth and pumping well spacing, both the pumping well point arrangement direction and the groundwater level descending depth perpendicular to the pumping well point arrangement direction will increase obviously. The depth of water level descending along the direction of pumping well arrangement is more obvious. In addition, under the condition of repeated precipitation, the decreasing rate of groundwater level will increase in the process of subsequent precipitation. The test also shows that the negative pressure at the well head of the pumping well is less than the negative pressure at the outlet of the vacuum pump, and the loss can reach 12.5. therefore, the length of the outlet pipe should be considered in the design of vacuum dewatering.
【作者单位】：河北建设勘察研究院有限公司;河北省岩土工程技术研究中心;北京交通大学土木建筑工程学院;
【基金】：国家自然科学基金资助项目(No.51279002)
【分类号】：TU463

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