【摘要】：在研究地下水污染修復、確定群井抽水的井間距、礦坑涌水量和渠道排水等問題時,需要采用穩(wěn)定流公式進行相關參數(shù)的計算。在穩(wěn)定流公式中,當抽水試驗的觀測井數(shù)量大于2時,計算的影響半徑和含水層參數(shù)是比較接近真實值的。但在實際工作中,很少有抽水試驗設專門觀測井,因此只能利用單井抽水試驗非穩(wěn)定流的影響半徑公式進行求參,然而該時間變量函數(shù)包含了多個未知參數(shù)。為了簡化影響半徑的計算方法,將函數(shù)中的抽水穩(wěn)定時長t和貯水系數(shù)μ*用工程試驗的經(jīng)驗值進行替換,得到一個影響半徑與含水層導水系數(shù)的簡單函數(shù),然后將Dupuit公式中的影響半徑用此函數(shù)替代,最后通過牛頓迭代法能夠同時得到影響半徑和含水層導水系數(shù)的值。利用該簡便公式計算的影響半徑值與帶2個觀測井的Dupuit公式和Theis公式計算的值進行對比,發(fā)現(xiàn)誤差都在可接受范圍之內(nèi),并且該值與Modflow水流模型模擬的抽水試驗最大影響半徑接近。因此,可以認為該簡化后的影響半徑公式適用于松散巖類承壓含水層抽水試驗求參。
[Abstract]:In order to study the problems of groundwater pollution remediation, well spacing, pit discharge and drainage, it is necessary to use the formula of steady flow to calculate the relevant parameters. In the steady flow formula, when the number of observation wells in pumping test is more than 2, the calculated influence radius and aquifer parameters are close to the true values. However, in practice, there are few special observation wells in pumping tests, so the parameters can only be obtained by using the influence radius formula of unsteady flow in single well pumping test. However, the time variable function contains many unknown parameters. In order to simplify the calculation method of the influence radius, the pumping stability time t and the water storage coefficient 渭 * in the function are replaced by the experimental values of the engineering test, and a simple function of influencing the radius and the water conductivity of the aquifer is obtained. Then the influence radius in Dupuit formula is replaced by this function, and the influence radius and aquifer conductivity can be obtained simultaneously by Newton iteration method. The influence radius calculated by this simple formula is compared with the values calculated by Dupuit formula and Theis formula with two observation wells. It is found that the errors are within the acceptable range. And this value is close to the maximum influence radius of pumping test simulated by Modflow model. Therefore, it can be considered that the simplified formula of influence radius is suitable for pumping test of loose rock confined aquifer.
【作者單位】： 中國地質(zhì)大學(北京)水資源與環(huán)境學院;中國地質(zhì)環(huán)境監(jiān)測院;中國地質(zhì)調(diào)查局水文地質(zhì)環(huán)境地質(zhì)調(diào)查中心;河北地質(zhì)大學;
【基金】：國土資源部公益性行業(yè)科研專項(201411074,201411083) 中央財政專項(1210800000022)
【分類號】：P641.73

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