Method for simulating roadway rock burst based on coaction of static load and blast load
A technology of joint action and rock burst, applied in the direction of applying stable tension/pressure to test the strength of materials, measuring devices, instruments, etc., can solve the hidden dangers of normal operation of mine safety production projects, cannot fully simulate the mechanism of rock burst, Insufficient understanding of rock burst mechanism and other issues, to reduce safety production risks, reduce damage, and avoid injuries
Inactive Publication Date: 2013-10-09
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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Problems solved by technology
Rock burst has caused more and more engineering accidents, which has brought great hidden dangers to mine safety production and normal operation of projects
Although extensive research on rock burst has been carried out on a global scale, the understanding of the mechanism of rock burst is still not deep enough, and further research is still needed
Model test is an effective method for simulating rock burst, but from the analysis of field rock burst investigation and research results, only static load or dynamic load methods cannot fully simulate the mechanism of rock burst
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[0029] Below in conjunction with accompanying drawing and example the present invention will be further described:
[0030] Low grade cement mortar is selected as the simulation material, the sand is medium sand, and the cement grade is P.O.32.5. The weight ratio of materials is: cement: sand: water = 1: 20: 1.5. Its 28-day uniaxial compressive strength is about 1.9MPa, elastic modulus is 380MPa, and tensile strength is 0.27MPa. In the embodiment, massive rock mass is simulated (the size of the block in the model body is about 2 cm). When ramming the model body, within the range around the cavern (0.8m in width and 0.7m in height), make blocks. The size of the block is about 2.0×2.0×4.0cm (length×width×thickness). It is at an angle of 45 degrees to simulate the massive rock mass around the cave; outside this range, no block processing is performed.
[0031] Such as figure 1 , figure 2 As shown, the test equipment is "YDM-D Geotechnical Engineering Structural Model Test S...
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Abstract
The invention discloses a method for simulating roadway rock burst based on coaction of a static load and a blast load. The method comprises the following steps of: A, selecting cement mortar and ramming a model in a rock model testing machine, and embedding a pressure sensor, an acceleration sensor and a strain gage in the model body; B, maintaining the model body within 28 days, applying initial crustal stress to the model body by utilizing the rock model testing machine, and testing force and deformation field distribution characteristics of the model body under the action of the static load; C, simulating actual cavern excavation characteristics, and measuring force and deformation field distribution characteristics in the model body after excavation each time; and D, drilling in the model body, mounting explosive cartridges and detonators in the drill bores, filling with loess, and detonating the explosive. By utilizing the method, the occurrence scale and time of deep roadway rock burst can be effectively predicted, damage of rock burst disasters on mine production settings can be reduced, the mine safety production risk is greatly reduced, and the production efficiency of the mine is greatly improved.
Description
technical field [0001] The invention mainly relates to the fields of deep resource mining, transportation, water conservancy and civil engineering industries, etc., and specifically relates to a method for simulating rock burst in a roadway under the joint action of static load and explosive load. Background technique [0002] With the increase of the excavation depth of deep caverns in large mines, water conservancy, transportation, and national defense projects, more and more rock burst problems have emerged. Rock burst has caused more and more engineering accidents, which has brought great hidden dangers to mine safety production and normal operation of projects. Although extensive research on rock burst has been carried out around the world, the understanding of the mechanism of rock burst is still not deep enough, and further research is still needed. Model test is an effective method for simulating rock burst, but based on the results of field investigation and resear...
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IPC IPC(8): G01N3/08G01N3/313
Inventor 顾金才王四巍刘汉东
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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