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考虑到接收系统过渡过程及电流关断时间,通过对接收系统冲激响应函数、一次电动势及二次全程感应电动势理论公式的推导,还原了接收瞬变电磁全程响应信号,与理论全程数据的对比分析表明,电流关断时间和接收系统过渡过程给早、中延时段瞬变场造成严重的畸变,导致数据解析不能有效识别坑道前方近距离地电信息。为评价畸变段数据对坑道超前探水的影响,建立坑道前方1∶1定量水仓模型,通过在掘进工作面连续观测100 m3以内水量变化情况下的瞬变场响应数据,分析并获得了含水模型的瞬变异常响应特征,确定其响应时窗处于畸变数据段,进一步指出现有坑道超前探水技术仍需不断改进,以提高超前预测精度。
Taking into account the transition process of the receiving system and the current turn-off time, the response of the receiving system impulse response, the primary electromotive force and the theoretical formula of the secondary full-induced electromotive force are deduced, and the response signal of the receiving transient electromagnetic is reduced. Compared with the theoretical data The analysis shows that the current turn-off time and receiving system transition process cause serious distortion to the transient field in the early and middle delay periods, resulting in that the data analysis can not effectively identify the geoelectric information in front of the tunnel. In order to evaluate the effect of the distorted section data on the advanced water exploration in the tunnel, a 1: 1 quantitative water storage model was established in front of the tunnel. By continuously observing the transient field response data under the water volume change of 100 m3 at the heading face, Model transient response characteristics of abnormal response time to determine its window in the distortion data segment, further pointed out that the existing tunnel advanced water exploration technology still needs continuous improvement in order to improve the accuracy of advanced prediction.