Device and method for measuring internal seepage pressure of tunnel surrounding rock

Abstract

The invention discloses a device and a method for measuring internal seepage pressure of tunnel surrounding rock. The device comprises a main frame, a drill hole closing mechanism, a seepage pressure measuring mechanism and a data processor, wherein the drill hole closing mechanism, the seepage pressure measuring mechanism and the data processor are arranged on the main frame; the main frame provides bearing capacity so as to be stably mounted in a drill hole; the drill hole closing mechanism is arranged on the main frame and is used for cutting off hydraulic connection between the drill hole and an outer space and performing one-way air pressure loading in the drill hole; the seepage pressure measuring mechanism is used for detecting a real-time seepage pressure; and the data processor is used for controlling the loaded air pressure and collecting seepage pressure data. According to the device and the method, disclosed by the invention, the operation of embedding the traditional seepage pressure monitoring element is eliminated, the operational complexity is reduced, waste of lots of monitoring elements is avoided, the working efficiency of measuring the internal seepage pressure of surrounding rock on the tunnel construction site is effectively improved, and the data accuracy is guaranteed.

Description

technical field [0001] The invention relates to a device and a method for measuring seepage pressure inside the surrounding rock of a tunnel. Background technique [0002] During tunnel construction, especially in areas where karst fissure water develops, hydrogeological conditions are complex. For a long time, there have been many examples of tunnel engineering accidents due to unrevealed groundwater. In order to have a clear understanding of the groundwater in the tunnel site area, the measurement of the groundwater seepage pressure inside the tunnel surrounding rock is essential and must be timely and accurate. [0003] The commonly used groundwater seepage pressure measurement method at the existing tunnel construction site is to embed the piezometer into the surrounding rock and then measure it through the reading instrument. The piezometer needs to be backfilled with sand and grouting, which is complicated to operate and affects the construction. And if it is a short-...

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Problems solved by technology

[0003] The commonly used groundwater seepage pressure measurement method at the existing tunnel construction site is to embed the piezometer into the surrounding rock and then measure it through the reading instrument. The piezometer needs to be backfilled with sand and grouting, which is complicated to operate and affects the construction. And if it is a short-term measurement, a large number of monitoring components will be wasted, time-consuming and labor-intensive, and the applicability is low

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