Sliding rockburst shear test system under dynamic disturbance

Abstract

The invention provides a sliding rockburst shear test system under dynamic disturbance. The sliding rockburst shear test system is characterized by comprising the following parts: a shear box member;a vertical loading device which applies a vertical load to the sample and includes an electromagnetic exciter applying an excitation load and a vertical dynamic pressure sensor disposed at the end ofthe electromagnetic exciter; a horizontal loading device including a horizontal loader and a horizontal pressure sensor disposed at the end of the horizontal loader; a data acquisition unit includinga dynamic displacement sensor set on the electromagnetic exciter, a horizontal displacement sensor disposed on the horizontal loader, distributed fiber grating sensors uniformly disposed on a portionto be tested of the sample in a net structure for performing real-time dynamic strain measurement on the portion to be tested, and a CT real-time scanning system that faces the shear box member for scanning the sample in the box and obtaining crack information of the sample; and a control portion.

Description

Technical field [0001] The invention belongs to the technical field of geotechnical engineering indoor mechanics test, and specifically relates to a sliding type rockburst shear test system under dynamic disturbance action. Background technique [0002] With the development of underground space and hidden resources by human beings, the depth involved in modern geotechnical engineering is increasing. Due to the "three highs" state (high in-situ stress, high temperature, and high osmotic pressure) of the deep rock mass and its joint and chemical characteristics, a large number of dynamic rock mass disasters will occur during engineering operations. Slip-type rock burst is a field of rock mechanics engineering. One of the hotspots of research by experts and scholars. [0003] Under dynamic loading and unloading disturbances such as blasting and excavation, the attachment of deep rock mass structural surfaces will produce stress concentration and high stress environment changes. Loadi...

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Problems solved by technology

[0004] For indoor tests, on the one hand, traditional structural surface friction test equipment is mostly static (quasi-static) test equipment, which cannot simulate dynamic disturbances or has limited disturbance capabilities. For example, due to technical and other reasons, most conventional servo testing machines have a disturbance frequency of around 5HZ. The upper limit of the low-frequency disturbance, while the blasting stress wave, seismic wave from rock mass instability, vibration wave caused by mechanical drilling or vibration of heavy equipment are mostly far beyond this range, the data obtained by these test equipment often cannot be better Reproduce the actual situation in the project; on the other hand, affected by many factors such as the difficulty of monitoring, the single-point measurement methods such as strain gauges and displacement gauges are still mainly used at present, and the measurement capability is limited, which limits further monitoring and analysis of the test

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