Study On Test Method Of Tianjin Binhai New Area Soil Permeability

The city of Tianjin as he economic center in North China, Beijing City, Hebeiprovince and other provinces as the hinterland, port construction is particularlyprominent,geological conditions of Binhai New Area Tianjincitybelongs to the coastalplainlandform, paralic strata, contains a large amount of silt clay and silt silty clay,water isthe characteristic region. Treatment of foundation in the construction processand groundwater, scheme selection is the troublesome problem of engineering, as anengineering and technical personnel, the starting point of this article is to deal withGroundwater provides a reliable experimental data, choose the suitable test methodofthe region. This paper summarizes a lot of permeability test method: indoor longhead,variable head permeability test, in situ pumping test, permeability test, water injectiontest, water pressure test. Illustrates the principle, method and application conditions ofvarious test. Complementary laboratory tests and in situ tests. On the method choice,should according to different design conditions, choose.Indoor seepage test ideal conditions, the flow direction is clear, not by planespoiler.But by soil disturbance degree, saturation degree influence, sensitivity of soilis higher, the greater the influence. Also, because the sample is small, the soil oftherepresentative for soil is poor, uneven distribution, local soil containing lens isobvious.The forward funnel pumping test can be applied hydraulic gradient is greater inthesoil, the permeability coefficient, the radius of influence design, waterreleasecoefficient of precipitation engineering calculation parameters related to thecalculation of soil by water discharge and catchment of observation wells, the flowdirection and the water and the actual precipitation water is flowing thesameconstruction. Therefore, Tianjin Binhai New Area for the undergroundengineeringhydrogeology of precipitation design exploration, appropriate uses thismethod. Butthis method is the average permeability coefficient test well water withinthe soil, ifonly for a single soil permeability were measured, it should adjust the waterposition,infiltration around but there will still be adjacent soil.