Induced Polarization System Using Drill Pipe Electrode for Tunnel Water Detection
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Solution Overview
Problem
Traditional induced polarization (IP) methods in tunnel boreholes face inefficiencies and poor detection precision due to limitations in drilling speed and interference from the drilling environment, particularly in deep tunnel construction where high water pressure and metal casing affect detection resolution and accuracy.
Innovation Solution
An IP system mounted on a while drilling-type drill rig with a long-length power source, utilizing a drill pipe as an electrode and an array-type data collection module to perform real-time IP detection and interpretation, allowing for dynamic identification of hazardous water sources by differentiating IP signals at varying depths and improving detection efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional point electrode source is used in borehole for IP detection, then detection can be performed, but detection time is long and efficiency is low
Solution Approach 1:
The patent combines multiple point electrode sources into a single line electrode source that spans the entire borehole length. This merging of multiple detection points into one continuous electrode allows simultaneous measurement across multiple depths, dramatically reducing detection time while maintaining comprehensive coverage of the target area.
Solution Approach 2:
The patent transitions from point-source detection (zero-dimensional) to line-source detection (one-dimensional) by deploying the electrode along the borehole axis. This dimensional change enables parallel detection at multiple depths simultaneously, transforming sequential measurements into concurrent operations and significantly improving detection efficiency.
2Measurement precision
If traditional point electrode source is used in borehole for IP detection, then detection can be performed, but detection precision and resolution are insufficient
Solution Approach 1:
The patent merges multiple measurement capabilities into a single line electrode configuration, enabling simultaneous detection at various depths along the borehole. This unified approach improves measurement precision by providing more spatial data points without requiring multiple separate measurement operations, thereby enhancing resolution while managing system complexity through integration.
Solution Approach 2:
The line electrode serves multiple detection functions simultaneously, acting as both the current source and the measurement electrode across different depths. This multi-functionality allows the single electrode structure to provide comprehensive geological information throughout the borehole length, improving detection precision without proportionally increasing device complexity.
3Measurement precision
If traditional IP method is used in tunnel borehole, then detection can be performed, but detection accuracy is poor due to interference from drilling environment such as metal casing
Solution Approach 1:
The patent extracts the detection system from the traditional borehole setup and relocates it to the drilling platform. By performing IP detection while drilling and positioning electrodes on the drilling rig rather than inside the borehole, the system eliminates interference from metal casings and other borehole-related conductive elements, significantly improving detection accuracy.
Solution Approach 2:
The patent performs IP detection during the drilling process itself, before the borehole is fully completed and before metal casings are installed. This preliminary detection action captures geological information before harmful conductive structures are introduced, ensuring higher measurement accuracy by avoiding interference from drilling environment elements.
4Length of stationary object
If traditional IP method is used in tunnel borehole, then detection can be performed, but detection depth and range are limited
Solution Approach 1:
The patent extends detection from point-based (zero-dimensional) to line-based (one-dimensional) by deploying the electrode along the entire borehole length. This dimensional transformation enables simultaneous detection at multiple depths, achieving both increased detection depth coverage and improved efficiency through parallel measurements across the vertical dimension.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly shortens in-borehole detection time, enhances detection accuracy, and allows for wide-range monitoring of abnormal conditions in front of the tunnel, improving overall detection efficiency by using a long-length power source and array-type data collection module.
Implementation Method 1
The present invention belongs to the technical field of induced polarization (IP) methods in tunnel borehole
Data Source
AI summary
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.