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水利设施的基础工程,经常处于地下水位以下。尤其是在砂性土地区,为了保证施工质量,必须要人为地降低地下水位。为此,需要在基坑开挖前,预先在其四周埋设一定数量的滤水管(井),利用抽水设备,抽取地下水,使地下水位降至基坑底部高程以下。同时在基坑开挖中仍需不断抽水,使所开挖的基坑,始终保持干燥状态,从根本上防止流砂的发生,
The basic works of water conservancy facilities, often below the groundwater level. Especially in the sand soil area, in order to ensure the construction quality, we must artificially reduce the water table. To do this, it is necessary to pre-excavate a certain number of drainage pipes (wells) around the excavation site prior to excavation. Pumping equipment is used to extract groundwater so that the groundwater level falls below the elevation at the bottom of the foundation pit. At the same time in the excavation of the foundation still need to continue pumping, so that excavation of the foundation pit, and always maintain a dry state, fundamentally prevent the occurrence of quicksand,