Experiment method for simulating axial micro-disturbance of dike to trigger type rock burst

Abstract

An experiment method for simulating axial micro-disturbance of dike to trigger type rock burst comprises the following steps: loading X-directional stress and Z-directional stress to a first rock sample, keeping two horizontal planes of Y-direction in a near empty state, allowing the X-directional stress to be static load stress, continuously increasing the Z-directional stress until the sample is destroyed, and recording basic parameters at the destroy moment; loading X-directional stress and Z-directional stress to a second rock sample, keeping two horizontal planes of Y-direction in a near empty state, allowing the size of the X-directional stress to be equal to the size of the X-directional static load stress, loading the Z-directional stress until a critical stress before rock burst occurrence is reached, applying micro-disturbance stress to the second rock sample by using a horizontal disturbance rod, carrying out continuous action until ejection destroy appears in the two horizontal near empty spaces of the Y-direction, and observing and recording the broken block ejection destroy process. The method truly simulates the force bearing state of a rock wall under high crustal stress and the axial micro-disturbance of engineering onsite blasting, mechanical vibration and other disturbance sources to the distant rock wall.

Description

technical field [0001] The invention relates to an experimental method for simulating a rockburst triggered by an axial micro-disturbance of a rock wall, which is particularly suitable for the research problem of rockburst in deep underground engineering, and belongs to the technical development field of water conservancy and hydropower engineering and geotechnical engineering. Background technique [0002] During the excavation of underground caverns such as hydropower underground powerhouses, mine roadways, railway and highway tunnels, the rock mass structure between the caverns is called rock wall. One of the outstanding stress characteristics of the rock wall is that there are two free faces under the condition of vertical and horizontal stress. Since the rock wall can deform to the free faces on both sides when the force is applied, the rock wall has a ratio of The surrounding rock of a cavern on the free side is more prone to instability and failure. In areas with hig...

AI Technical Summary

Problems solved by technology

At present, limited by the conditions of experimental equipment, most of the indoor simulation methods for rockbursts are implemented under the action of static loads, and the experimental method of rockburst triggered by disturbance, especially the axial micro-disturbance triggered by the disturbance source on the remote rock wall. Urgently to be developed

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