Rock mass stress monitoring device and monitoring method in open-pit mine goaf

Abstract

The invention relates to a monitoring device and a monitoring method for rock mass stress in an open pit mine goaf. The device comprises anchor bolt dynamometers and is characterized in that the device further comprises two horizontal bottom plates, support assemblies and lifting mechanisms. Each support assembly is composed of a base and a support column, wherein the base and the support column are in a set. Each lifting mechanism is composed of a pulley central shaft, a bracket, a pulley and a wrapped load cable. Each pulley central shaft is horizontally arranged at the top of a support column. An anchor bolt comprises a number of upper anchor bolts and lower traction anchor bolts. Anchor bolt dynamometers are fixedly connected between a number of upper anchor bolts and between the upperanchor bolts and the lower traction anchor bolts. An annular sleeve is arranged on the lower end of each lower traction anchor bolt. The lower end of each load cable is fixedly connected with an annular sleeve. According to the invention, extra long anchor bolts and anchor bolt dynamometers are arranged on the roof of the open pit mine goaf in which large lifting equipment cannot be used; and thedevice has the advantages of simple structure, easy operation and easy installation and disassembly.

Description

technical field [0001] The invention belongs to the technical field of installation of monitoring instruments for the working load of bolts in goaf roofs such as mine safety production and mining engineering, and in particular relates to a rock mass stress monitoring device and monitoring method inside goafs of open-pit mines. Background technique [0002] In the process of mining and underground space engineering construction, in order to ensure the safety of construction and production, it is necessary to monitor the stability of the goaf. At present, the stability monitoring of the goaf mainly includes three types: stress, displacement and internal damage monitoring of the rock mass. In order to monitor the stress change of the surrounding rock of the goaf, it is generally necessary to install a bolt dynamometer. In the field of mining engineering, bolt dynamometers are generally used for monitoring the roof and two sides of underground mines or the slope of open pit mine...

AI Technical Summary

Problems solved by technology

Compared with the installation process of traditional anchor dynamometers, there are three difficulties in the installation of roof anchors and anchor stress gauges in open-pit gobs: ①The thickness of the roof in open-pit goafs can often reach about 20m. The bolt dynamometer needs to be connected multiple times, and the total weight of the bolt body is relatively large; ②The monitoring holes on the roof of the open-pit goaf are generally downward vertical holes, and it is difficult for heavy bolts and bolt dynamometers to be dragged manually by conventional methods. installation method; ③ large mechanical lifting equipment cannot be used above the empty area

This brings great difficulties to the stress measurement of the goaf roof in open-pit mines

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