On-site simulation test method of strain-type rockburst induced by weak blasting

Abstract

The invention discloses a weak blast-induced strain-type rock-burst site simulation test method. The method comprises the steps of digging a test branch cave and a monitoring branch cave in the maximum burial depth section of a deep-buried tunnel, determining a stress concentration region in surrounding rock of the monitoring branch cave by virtue of numerical simulation, drilling blast holes in the stress concentration region of the surrounding rock, filling the blast holes with explosives at the bottoms, simultaneously setting vibration and dynamic strain test holes, generating a weak blast to induce strain energy accumulated by rock masses of the stress concentration region to release to form a simulated rock blast, and carrying out dynamic strain and vibration testing on a dynamic effect of the rock burst during the test. According to the method, by analyzing actually measured vibration and dynamic strain data of the rock masses, the internal relation among the energy release speed, the magnitude of induced vibration and the rock burst intensity during the rock bursting is revealed, to facilitate the prediction, prevention and control of the rock bursting; and the method can be widely applied to the fields of hydraulic and hydropower engineering, traffic, mines, national strategic defense and deep basic physical experiments and has important significances in the prediction, prevention and control of the rock bursting and the guarantee of construction safety of underground cavities.

Description

technical field [0001] A weak blasting-induced strain-type rockburst field simulation test method can be widely used in field simulation of deep-buried underground engineering strain-type rockburst in the fields of water conservancy and hydropower engineering, transportation, mines, national strategic protection, and deep basic physics experiments. Background technique [0002] my country is the world's largest energy consumer, and 80% of primary energy is provided by coal. In order to ensure national energy and environmental security, during the 13th Five-Year Plan period, my country will add 60 million kw of conventional hydropower installed capacity, and a number of large-scale hydropower projects using deep-buried diversion tunnels and underground powerhouses will be built in western my country. Large burial depth and high ground stress are the biggest characteristics of deep burial projects in Southwest my country. For example, the maximum buried depth of the four dive...

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Problems solved by technology

However, it is difficult to reproduce the whole process of rockburst under the test conditions. It is usually difficult to simulate the actual engineering excavation conditions in laboratory tests, and the form and size of rock samples are also quite different from the actual rock mass. lack of

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