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一、问题的提出利用水动力学法确定地下水水量时,含水层的渗透系数(K)是一个重要的水文地质参数。该值的可靠程度,对于水量计算值的影响极为明显。对同一试验对象来说,依据不同的试验观测资料,采用不同的计算方法和公式,所确定的渗透系数计算值,有时可以相差数倍乃至数十倍;因而,使计算的水量值,也相应地相差数倍乃至数十倍。目前,生产实践中仍然多是根据稳定抽水试验资料,利用以裘布依单井公式为代表的各种计算公式来确定渗透系数。抽水可以是在带有观测井的主井中或在无观测井的单井中进行。通常,利用两个以上观测井中的水位观测资料确定的K值较为可靠。但是,这种抽水试验需要较多的勘探及试验工作量,不是在任何情况下都有条件进行的。
I. PROBLEM PROBLEM The permeability coefficient (K) of aquifers is an important hydrogeological parameter when determining the amount of groundwater using the hydrodynamic method. The reliability of the value, the impact of the calculated value of water is very obvious. For the same test object, based on different experimental observation data, using different calculation methods and formulas, the calculated values of the permeability coefficients may sometimes differ by several times or even tens of times; thus, the calculated water amount also corresponds to Difference to several times and even several times. At present, production practice is still based on more stable pumping test data, the use of Qiu Bu according to single well formula represented by various calculation formulas to determine the permeability coefficient. Pumping can take place in the main shaft with the observation well or in the single well without the observation well. In general, it is more reliable to use the K values determined from observed water level data from more than two observation wells. However, such pumping tests require more exploration and experimental work and are not always carried out under any circumstances.