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在一般的水文地质学中,已经收集了较多的利用扬水试验计算土层渗透系数的公式。但是这些公式均只能用来计算附近没有河流被给地下水的、用下沉过滤器建成的完整井的扬水试验成果。在试验河滩砂卵石的渗透系数时,这些公式往往均不能利用。在陈村水库进行河滩砂卵石中的扬水试验时,由于卵石较多,不便下沉过滤器。且临近河流,抽水时几乎全部为河水补给地下水。因而我们就采用了土办法,不用过滤器,用人工挖坑进行扬水试验,并推导了一个近似的渗透系数计算公式。当地的具体条件如附图所示。计算中采用的符号如下: R——由扬水坑至河床距离(公尺); r——扬水坑的平均半径(公尺); h——地下水位以下的透水层厚度(公尺),应先用冲击钻求得;
In the general hydrogeology, more formulas have been collected to calculate the permeability coefficient of the soil using the lift test. However, these formulas can only be used to calculate the results of the lift test of a complete well built with a subsidence filter, where there is no river nearby. When testing the seepage coefficient of beach sand pebbles, these formulas are often not available. When the Chencun Reservoir conducts a dredge test in riverbank sand and gravel, it is inconvenient to sink the filter due to the large amount of pebbles. Near the river, almost all the water is supplied to the groundwater when pumping water. Therefore, we used the soil method instead of a filter to dig a pit manually to carry out a lift test, and deduced an approximate formula for the permeability coefficient. Local specific conditions are shown in the photos. The symbols used in the calculations are as follows: R—the distance from the pit to the riverbed (meters); r—the average radius of the pits (meters); h—the thickness of the permeable layer below the groundwater level (meters) should be First with impact drill;