Engineering rock body sound emitting monitoring and transmission system

Abstract

The invention discloses an engineering rock body sound emitting monitoring and transmission system, which comprises a sound emitting sensor and a ground work station, wherein the sound emitting sensor is arranged in a drill hole of a monitored rock body, and transmits a received monitoring signal to the ground work station through a cable; the sound emitting sensor consists of a sound emitting probe, a probe installing mechanism and a transmission mechanism; the transmission mechanism is used for transmitting the probe installing mechanism provided with the sound emitting probe to a set position in the drill hole; the probe installing mechanism comprises a casing and a probe sleeve; the casing is connected with the transmission mechanism; and the probe sleeve is used for accommodating the sound emitting probe. The probe installing mechanism in the engineering rock body sound emitting monitoring and transmission system solves the problem of effective installing and coupling difficulty of the sound emitting probe through the mutual matching of a spring and an air bag arranged between the casing and the probe sleeve; and the effective coupling of the sound emitting probe and the hole wall of the drill hole is ensured, so that the monitoring and prediction reliability on the mine rock (body) stability and rock blasting dynamic catastrophe is enhanced.

Description

technical field [0001] The invention belongs to the technical field of rock (body) engineering safety monitoring in engineering construction, and relates to an engineering rock mass acoustic emission monitoring and transmission system. Background technique [0002] Rock (body) deformation and damage during engineering construction, especially rockburst dynamic disasters, will directly endanger the safety of the project and even cause catastrophic effects. Therefore, effective monitoring and monitoring of rock (body) stability and rockburst dynamic disasters Forecasting is one of the important contents of engineering safety construction. At present, as an important means of non-destructive monitoring, acoustic emission is used in the monitoring and forecasting of rock (body) stability and rockburst dynamic disasters in engineering construction. [0003] During the excavation and construction of surrounding rocks in underground engineering, in order to accurately predict the ...

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Problems solved by technology

[0005] (1) At the engineering site, the acoustic emission probe is directly placed in the borehole, relying on the residual liquid medium (such as water) in the borehole as the medium for signal transmission between the rock mass and the acoustic emission probe, the acoustic emission probe will receive The detection signal is transmitted to the ground monitoring system through cables; however, this method has the following disadvantages: ① This implementation is only suitable for drilling holes with a downward direction, and for drilling holes that are completely horizontal or upward at a certain angle, it is difficult to store Even for the downward drilling, the rock mass around the drilling still needs to be relatively intact, so as to avoid the loss or seepage of the transmission medium from the borehole cracks, and ensure that the AE probe is always in the transmission medium, but the actual site However, it is difficult to meet this requirement, which affects the monitoring effect; ②Although the liquid between the rock mass and the acoustic emission probe can be used as the coupling medium for signal transmission, the density of the liquid is generally relatively low, and its signal transmission effect is not as good as that of the acoustic emission probe directly. The detection signal received by the transmitter probe in effective contact with the rock wall

[0006] (2) In order to ensure effective coupling between the acoustic emission probe placed in the borehole and the borehole wall, cement can also be poured into the borehole at the engineering site so that the acoustic emission probe and the rock wall are poured as a whole. Although this method It can solve the problem of effective transmission of detection signals, but there are still the following defects: ①The acoustic emission probe after casting is not recyclable, resulting in high monitoring costs; adjustment, only to re-drill and install new acoustic emission probes, which not only leads to high monitoring costs, but also leads to prolongation of the project progress and even delays in the construction period; The grouting effect of the installation part of the acoustic emission probe is difficult to guarantee, and there may be situations where the installation part of the acoustic emission probe cannot be effectively grouted, resulting in no effective coupling between the acoustic emission probe and the rock wall and no monitoring signal; Deeper, the greater the total shrinkage and deformation of the poured cement after solidification, the signal transmission cable of the acoustic emission probe bonded to the cement will bear tension due to the shrinkage and deformation of the cement, resulting in ineffective signal transmission; ④ During the excavation process Explosive blasting may cause the grouting surface and the rock wall surface to r

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