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Engineering survey of small-diameter well pumping test


Test drilling as well, the irrigation water to the wells and wash wells with pump try pumping until the well water clean up before the test, the power supply, water pump connected between the coupling transformer White start voltage 220V, pump water to reduce the voltage to normal immediately after the estimated Chung water. During the experiment, pay close attention to pumping and stability, are subject to change at any time regulator to keep the water stable. According to experience, and wash well cementing shallow pumping test drawdown is limited, the first drop of water in depth control Ide 25cm. / S or so. Figure 2 shows pumping 100rmn, the water and the water level drawdown is basically stable, stable time 200m] n, steady drawdown pumping average G2.8cm, observation wells 3cm,Salvatore Ferragamo outlet, steady flow of an average of 26cm. / S. The first drawdown after the pump stops,Beats By Dre Studio, the recovery observed water level, water level recovery time 10rain. (Figure 2) Nanjing Institute of Architecture Journal 1994Qicm 2 pumping drawdown () and the pumping capacity (Q)-time curve - a first down deep; second drawdown; ol probe pumping down the first second} mussels observed drawdown pumping pumping Bu n-, I-f- ----- 3 hydrogeological model of the second drawdown calculation control pumping 4ocm / s or so. Stable water level and flow time of 140min, pumping wells and observation wells to lower the average depth were 129.3cm and 11cm,herve leger sale, averaged steady flow 42.4cm. / S. (2) 2 test results according to test site hydrogeological conditions, generalized computing model shown in Figure 3. Steady flow of non-complete selection of diving well calculated aquifer permeability coefficient K, and its style is as follows; K a [2.3-s a sn) where: Q - pumping, cm / s; S, r a, respectively of pumping wells and observation wells drawdown, cm} rI - pumping wells to observation wells in the distance, cm; - pumping well radius, cm; l - f0-0.5 (S - SO; f. as filter length, cm. According to the pumping test to calculate the permeability coefficient K values ​​listed in Table 1 Table 1 Table permeability coefficient (1) He seal, etc.: engineering survey of small-diameter well pumping test 673 test results to discuss the two lower pumping test depth values ​​were obtained (9.22 × 10) cmls and (8.56 × 10 ~) cmls. value is very close, indicating the test or power. pumping test to obtain the permeability coefficient of the average (8.89 × 10 a) cmls (0.77m / d). For comparison, I had indoor soil test,tods shoes outlet, the measured permeability coefficient of this layer the average (1.38 × 10) cm / s (0.12mid), much smaller than the pumping test results, not to its% comparison shows that the laboratory measured permeability coefficient, due to the small size and soil samples from the geological environment, the value was significantly lower, which is common laboratory test engineering geological investigation issue 4 Conclusion small diameter well pumping test results show that this test method for determination of engineering geological investigation in construction often encountered in groundwater buried depth, poor permeability, the formation of a small amount of water permeability coefficient, commonly used laboratory determination of low accuracy and technical complexity of large investment and construction of conventional large-diameter well pumping test, the results of this Law with a reliable, convenient trip engineering,herve leger skirts, economic and good. ExplorationoHthePumpingTestinSmallDiameterWellforE ngineeringInvestigationHeDaylnLiaoChanggui (DeptofGeotechnicalInvestigationandSu ~ eryingtNan ~ ngAehitecturalandCivilEngineer [t ~ gT ~ tkute, Nanii ~, 210009) AbstractThispaperproposesthepumpingtestinsmalldiam eterwellwhichissuitableforengineeringinvestigation .Ithasadvantagesofcostructionexpedience, savingconst, etc.Anditsresultinreliable.Keywordsengineeringinve stigation; pumpingtestcoefficientofpermeabity
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