巷道U型激电探测及近似反演

U-type induced polarization detection and approximate inversion of the tunnel

利用巷道顶底板或侧帮进行联合探测,即形成U型的观测系统,其分两步进行:分别在巷道两个侧帮上布设电极并进行独立的观测,并独立完成两个侧帮的反演;在迎头布设观测电极,供电电极在侧帮上同步向后方移动观测,利用侧帮的反演结果作约束,完成迎头前方的反演。采用约束最小二乘最优化反演算法对两个模型进行二维近似反演,算例表明:巷道U型探测数据的二维近似反演对巷道侧方能获得较好的结果,利用侧方结果约束联合解释能对迎头前方进行反演成像。巷道U型探测充分利用巷道侧方和迎头探测的客观差异,能提高迎头超前探测效果。

Using the tunnel top and bottom or sides joint detection,so as to form an U-shaped observation system,which is divided into two steps.First,to finish the inversion of the tunnel sides based on the independent observations with electrodes laid on tunnel sides.Second,in head-on layout observation electrodes,electrodes power supply in the side to help synchronous to the rear movement observation,inversion results of the side wall as a constraint to complete the inversion of head-on in front.Using constrained least squares optimization inversion algorithm to complete two-dimensional approximate inversion of the two models,examples show that the tunnel U-type detection data of two-dimensional approximate inversion of the roadway side can obtain better results,using the results to explain the lateral constrained joint inversion imaging of head-on in front.The U-type exploration of tunnel makes full use of the objective difference between the side of the roadway and the head-on detection,and can improve the head-on detection effect.