Calculation of filtration coefficient, radius of influence and piezometric level lowering according to the data of group pumping from imperfect wells

Abstract

In hydraulic engineering construction, mining, construction of subways, construction of deep foundations, etc., the method of artificial lowering of groundwater level is used more and more often. Especially widespread has found water lowering on modern grandiose hydraulic engineering construction sites, such as the Volga-Don, Kakhov hydroelectric complex, construction of hydroelectric stations near Kuibyshev and Stalingrad and others. There are also known a number of cases of sinking mine shafts and dewatering of coal and other mineral deposits with the help of dewatering plants. At the same time, when designing new dewatering installations or rearrangement of existing drainage systems consisting of variously designed dewatering wells, drainage wells, needle filters, etc., there are difficulties in calculations of the main efficiency indicators of such installations. They mean calculations of necessary level lowering in any point of the site, determination of total water inflow at different location and different design of drainage devices, determination of flow rate of separate interacting excavations, etc. For these calculations, in turn, it is necessary to have such indicators as water permeability coefficient, radius of influence and some others.