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1 ．含水层导水系数(T)的确定在相同条件下,含水层厚度大,视横向电阻(Rt)大,颗粒粗Rt也大,公式Rt＝P2·H2;含水层导水系数(T)也取决于含水层厚度和结构,即T=K·h。可见T与Rt 存在着正相关关系。这样求取了T-Rt相关曲线,其导水系数便可求出。解释野外所做的电测深曲线确定出Rt;利用7个已知抽水孔的资料确定含水层导水系数;将计算出的T值与Rt值对比,分别建立Q 砂卵石层和Q2 泥质卵石层中T-Rt相关曲线(直线)。经计算,Q3 层中T－Rt相关系数γ=0．964(Q2层略),证明相关曲线可靠。依据T=Rt 相关关系绘制了“导水系数分布图”,计算出Q3 层的渗透系数(K)值80—120m/d,Rt/T值2．13—2．68,Q2 层的K值40—50m/d,Rt /T 值5—8。2．含水层有效孔隙度()的求取利用阿尔奇公式求取。野外采用电测深法。先求出11个已知孔含水层电阻率(ρs);野外采水样,室内分析,依据16℃时地层水(ρw)与矿化度(C)关系图确定各孔ρw;取m=1．5,利用上述公式求出各孔值。Q3层 值0．1769—0．3444,多数0．2—0．25。此值与室内试验得出的值0．25一致,与重力给水度经验值0．23—0．26相近。
1 . Aquifer coefficient (T) is determined under the same conditions, the aquifer thickness, depending on the large transverse resistance (Rt), coarse particle Rt is also large, the formula Rt = P2 · H2; aquifer conductivity coefficient Depends on aquifer thickness and structure, ie T = K · h. Visible T and Rt there is a positive correlation. T-Rt thus obtained the relevant curve, the conductivity coefficient can be obtained. The electric sounding curve made in the field was interpreted to determine Rt. The water-bearing coefficient of aquifers was determined by using the data of seven known pumping holes. The calculated T value was compared with Rt value to establish the Q-pebble layer and the Q2 shale T-Rt correlation curve (straight line) in pebble layer. Calculated, Q3 layer T-Rt correlation coefficient γ = 0.964 (Q2 layer slightly), to prove that the correlation curve is reliable. According to the correlation of T = Rt, the “hydraulic conductivity distribution” is plotted, and the permeability coefficient (K) of Q3 layer is calculated to be 80-120m / d, Rt / T value is 2.13-2.68, 40-50m / d, Rt / T value 5-8.2. The effective porosity () of the aquifer is calculated by Archie’s formula. Field electric sounding method. The resistivity (ρs) of 11 well-known aquifers was obtained first. After field water sampling and indoor analysis, ρw of each pore was determined according to the relationship between formation water (ρw) and salinity (C) at 16 ℃; m = 1.5, using the above formula to determine the value of each hole. Q3 layer value of 0.1769-0.3444, the majority of 0.2-0.25. This value is consistent with the value of 0.25 obtained in the laboratory test and is similar to the empirical value of gravity feed water supply of 0.23-0.26.