Method applied to fine detection of sudden water burst channel in underground engineering and evaluation of grouting and plugging effects of sudden water burst channel

Abstract

The invention discloses a method applied to the fine detection of a sudden water burst channel in underground engineering and evaluation of grouting and plugging effects of the sudden water burst channel. The method comprises the following steps: carrying out complex geophysical prospecting general survey and primarily determining the occurrence range, the scale and the general boundary of the space of the sudden water burst channel; carrying out fine detection of a cross-hole geological radar; implementing cross-hole CT fine detection of a three-dimensional resistivity; and tracking, monitoring and evaluating the whole process of grouting and plugging by virtue of a time-lapse-inversion-based full-space three-dimensional resistivity cross-hole CT method. The method has the advantages that results of complex geophysical prospecting general survey and cross-hole radar detection are mapped to a structural reference model, the three-dimensional resistivity cross-hole CT inversion is taken as a carrier, and the location accuracy of the sudden water burst channel and interface resolution effect are obviously improved; the time-lapse-inversion-based full-space three-dimensional resistivity cross-hole CT detection method is used for monitoring the whole process of grouting and plugging; the beneficial reference is provided for finding and plugging loopholes in time and further guiding the grout replenishing operation.

Description

technical field [0001] The invention belongs to the field of underground engineering, and in particular relates to a method for fine detection of inrush water channels in underground engineering construction and its grouting sealing effect evaluation method. Background technique [0002] Geological disasters such as water inrush and mud inrush have become major challenges affecting the safety of tunnels and underground engineering in my country's transportation, water conservancy and hydropower, and mining fields. Water gushing disasters have always been at the forefront of various disasters in terms of casualties and economic losses. For inrush water disasters in underground engineering construction, grouting plugging is a main control means and method. In the grouting plugging of inrush water disasters, the exploration of inrush water channels is a pilot work, which can detect the spatial location and occurrence form of underground engineering inrush water channels in adva...

AI Technical Summary

Problems solved by technology

[0004] First, due to the complex geological environment and large buried depth of underground engineering construction, it is difficult to obtain better detection results by ground geophysical prospecting methods; a single geophysical prospecting method in caves cannot integrate known geological information, and the inversion equation is highly ill-conditioned and multi-solvable , false anomalies are prone to appear in the detection, and the positioning effect is poor; the abnormal body is too close to the electrode, which will easily cause the local electric field near the electrode to be distorted, and the imaging results will be deviated

Unresolved 3D fine-tuning problems leading to inrush water channels

[0005] Second, the grouting plugging process of inrush water channels has a strong concealment. Existing technologies such as borehole detection methods, digital borehole cameras, and geophysical prospecting methods are difficult to track and monitor the migration of grout veins during the grouting process. The path, coverage area, and sedimentation and nuclear conditions cannot detect the plugging loopholes in time, laying hidden dangers for the second water inrush accident

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