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提出了考虑巷道影响的边界元正演新算法．选取无巷道层状介质全空间电位函数为基本解，消减了边界积分方程中无限大电性层界面上的面积分项，并采用分块Ｇａｕｓ消元法求解边界积分方程组，使得在微机上进行巷道底板电测深边界元法正演成为现实．数值算例揭示巷道对底板电测深曲线的影响特征与巷道所在层及其顶、底板的层参数有关，巷道影响因子曲线呈非线性变化趋势．
A new algorithm of forward modeling of boundary element considering influence of roadway is proposed. The full space potential function of the layered medium without a tunnel is selected as the basic solution to reduce the area fraction of the infinite boundary layer in the boundary integral equation. The block boundary integral equations are solved by the block Gaus elimination method. It is a reality that the boundary element method of electrical sounding of roadway floor is forward. Numerical examples reveal that the influence characteristics of the roadway on the floor sounding curve are related to the layer parameters of the floor and the roof and floor of the roadway, and the influence curve of the roadway shows a nonlinear trend.