A rock fracturing acoustic emission online monitoring system

Abstract

The invention discloses an acoustic emission online monitoring system for rock fracturing. The acoustic emission online monitoring system comprises an upper computer, a WiFi transceiving converter andat least two acoustic emission detection devices, wherein the at least two acoustic emission detection devices are connected with the upper computer through the WiFi transceiving converter; the acoustic emission detection device comprises at least one acoustic emission sensing probe, a data acquisition module, an FPGA module and a wireless WiFi module; at least one acoustic emission sensor is connected with the FPGA module through the data acquisition module, and the wireless WiFi module is connected with the FPGA module; and the at least two acoustic emission detection devices carry out chain communication through the wireless WiFi module. By adopting WiFi chain communication, monitoring equipment can be easily mounted, the monitoring range is expanded, and the loss of signals is prevented; and subsequent positioning and signal analysis and processing are facilitated, and acoustic emission signals of rock fracturing can be accurately reflected.

Description

technical field [0001] The invention relates to the technical field of rock monitoring, in particular to an online rock fracturing monitoring system based on acoustic emission technology. Background technique [0002] As more and more tunnels or underground projects are constructed, and they gradually expand to deep areas, the problem of rockburst is becoming more and more prominent. Rockburst is generally a dynamic damage phenomenon of surrounding rock caused by excavation and unloading of underground engineering rock mass in hard rock under high ground stress state. The tangential stress of the rock gradually increases, and when the tangential stress exceeds the bearing capacity of the surrounding rock, rock mass delamination, collapse and even ejection rupture occur. The occurrence of rockburst geological disasters directly threatens the safety of construction personnel and equipment, seriously affects the progress of the project, and brings disastrous consequences to th...

AI Technical Summary

Problems solved by technology

In this patent, the three-dimensional acoustic emission sensing device is arranged on the side walls of underground projects such as tunnels, and the three-dimensional acoustic emission sensing device senses the on-site three-dimensional acoustic emission signal; the multi-channel acoustic emission synchronous data acquisition device is used to collect the on-site three-dimensional acoustic emission signal, and pass The optical fiber network sends real-time data to the host computer; the host computer displays the current acoustic emission waveform in real time, and realizes the real-time positioning of the on-site acoustic emission source through the acoustic emission positioning algorithm, and dynamically displays the intensity and distribution position of the acoustic emission. The problem in this patent is due to A complete set of acquisition equipment is used, the acoustic emission sensing device and the sensor data need to be collected through a multi-channel synchronous data acquisition device, and the collected signal needs to be converted into an optical signal and transmitted to the host computer for processing through an optical cable, so that wiring on the project site Difficult, and because the problem of long sensor wiring will cause signal attenuation, in order to prevent the attenuation of the acoustic emission signal in the prior art, a preamplifier used with the probe is usually used, which will increase the cost and make the acoustic emission signal pass through Part of the signal is lost after preamplification

However, this patent does not disclose how to obtain the acoustic emission characteristic parameters on the lower computer, nor does it preprocess the collected acoustic emission signals, which is difficult to apply in engineering practice

Images