Shandong University

Yuancheng Li

Lichao Nie

Zhiqiang Li

Zhaoyang Deng

Shucai Li

Lei Han

Shaoyang Dong

Guoan Chu

Pengyu Jing

Shixun Jia

The present invention provides a full-decay induced polarization (FDIP) detection system and method for water inrush in tunnels, comprising: through instructions for controlling constant-current high-power transmitting module and multi-channel parallel data acquisition and receiving module, receiving observation data and performing inversion by replacing minimum gradient support constraint to traditional smooth constraint, introducing data shape as prior information into inversion objective function, and constructing and solving focusing inversion formula of FDIP detection for water inrush in tunnels based on data shape constraint, to update model parameters; completing multi-source information acquisition of apparent resistivity, polarizability and the like and multi-parameter inversion imaging of zero-frequency resistivity, relaxation time, chargeability and frequency correlation coefficient, effectively reduce electromagnetic interference and improve detection efficiency, greatly meet the urgent requirement for detecting sudden water inrush disaster sources in front of tunnel face under construction, and having strong research significance and application value.

Full-decay induced polarization detection system and method for water inrush in tunnels

The invention provides an induced polarization method and system mounted on a while drilling-type drill rig based on a long-length power source for water detection in tunnels, wherein the IP system comprises a long-length power source module for power supply while drilling, comprising a long-length power source and an electrode being a drill pipe of the while drilling-type drill rig; an array-type data collection module; and, a positioning and interpretation module, that may interpret and image data induced separately when a point power source is located near a drill bit at a current time obtained by differentiating an IP signal for water detection in tunnel at the current time from an IP signal for water detection in the tunnel at a previous time, to realize a dynamic identification of hazardous water sources in front of the tunnel face, and the detection while drilling or multi-detection while drilling.

Induced polarization method and system mounted on while drilling-type drill rig based on long-length power source for water detection in tunnels

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Jinan, China

Yuancheng Li