An active detection method for unfavorable geological bodies in front of double-hole tunnel construction

Abstract

The invention belongs to the technical field of tunnel survey and particularly relates to an active detection method of bad geological bodies in front of a double-hole tunnel during construction. According to the method, on the one hand, the bad geological bodies in front of a second tunnel body is detected by utilizing early footage of a first tunnel body and an excitation signal generated duringexplosion of shot holes in a working face of the second tunnel body, and therefore the construction progress cannot be delayed; on the other hand, a velocity field can be formed in a front detectionarea of the second tunnel body according to the linear distance from the excited shot holes to a sensor, the initial time and the arrival time, and the changes of the physical and mechanical characteristics of the geological bodies in front of the double-hole tunnel can be reflected according to the velocity field; on the basis of the changes, the spatial positions and geometric shapes of the distribution of the bad geological bodies are rapidly judged, and an accurate advanced geological forecasting result of the working face is provided. The method is high in detection speed and facilitatesconstruction.

Description

technical field [0001] The invention belongs to the technical field of tunnel survey, and in particular relates to an active detection method for unfavorable geological bodies in front of double-hole tunnel construction. Background technique [0002] Tunnel engineering is a kind of geological engineering. Although the tunnel design and engineering geological survey before construction predict and predict the geological conditions of the tunnel to a certain extent, due to the complexity of the rock mass, the survey data and the tunnel excavation The actual situation may be quite different. There are a large number of tunnel projects in the field of water conservancy, hydropower and transportation in my country. Geological disasters are the key factors restricting tunnel construction. Often due to the unknown geological conditions in front of the tunnel and the inability of survey data to fully and accurately reflect the geological conditions in front of the construction tunne...

AI Technical Summary

Problems solved by technology

[0003] When excavating the tunnel, due to the need to detect and forecast the unfavorable geological bodies ahead, a series of detection equipment and measures are required, but this also greatly slows down the progress of the construction

For double-hole tunnels, if the detection and prediction are carried out hole by hole, it is bound to have a great impact on the site construction

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