Method for determining disturbance sensitivity of deep rock
A deep rock and sensitive technology, applied in the direction of applying stable tension/pressure to test material strength and strength characteristics, using acoustic wave emission technology for material analysis, etc., can solve unclear problems, and achieve simple equipment and simple measurement methods Effect
Active Publication Date: 2022-04-12
CHINA UNIV OF MINING & TECH
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However, in the deep in-situ environment, mining with different excavation methods, that is, applying different disturbance stress paths to the rock mass, whether there is a correlation between the deformation and failure characteristics of the rock and the disturbance modes of different degrees is still unclear.
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[0028] The present invention will be further described below.
[0029] Such as figure 1 Shown, concrete steps of the present invention are:
[0030]S1. Use the same rock (such as red sandstone) to make multiple samples of the same shape, and confirm that there is no obvious damage inside each sample through the wave velocity test, and the integrity is good;
[0031] S2. Select a sample from step S1 and fix it in the rock test system, and at the same time arrange the acoustic emission measurement probe evenly on the sample surface, and use Vaseline to couple the contact surface between the probe and the sample surface;
[0032] S3. Set the burial depth to 500m, and then simulate the hydrostatic pressure loading, the first loading and unloading stage, and large disturbance construction of the samples in step S2 in sequence to complete a disturbance stress path, and the acoustic emission measurement probe Record the accumulative energy of acoustic emission and the accumulative ...
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The invention discloses a method for determining disturbance sensitivity of deep rocks, which comprises the following steps of: firstly, simulating stress state evolution of a rock sample under different burial depths and different disturbance stress paths, and capturing an acoustic emission signal of the rock sample in a loading period by combining an acoustic emission measurement system; acquiring real-time acoustic emission energy information and acoustic emission event positioning point information of the rock sample in the loading process; meanwhile, the acoustic emission time sequence distribution fractal dimension and the acoustic emission event space distribution fractal dimension of the rock sample in the loading process are calculated. The acoustic emission accumulated energy and the acoustic emission event positioning point accumulated number of rock samples under different burial depths under a disturbance stress path are compared, and analysis is carried out by combining the change trend of the acoustic emission time sequence distribution fractal dimension and the acoustic emission event space distribution fractal dimension of the rock samples; therefore, the disturbance sensitivity of the deep rock can be determined, and data support is provided for analysis of large deformation-discontinuous deformation behaviors and laws of the rock mass under deep excavation disturbance in the later period.
Description
technical field [0001] The invention relates to the technical field of rock mechanics and engineering, in particular to a method for determining the disturbance sensitivity of deep rocks. Background technique [0002] In the construction and design of deep underground engineering, the first engineering technical problem that needs to be solved is the stability control of rock mass under excavation disturbance. However, the rock mass instability failure and disaster-causing process is actually a process in which the deformation of the rock mass is aggravated under the disturbance of excavation, that is, under the disturbance stress path. At the same time, the deformation and failure behaviors of rock mass are quite different under different excavation methods. Therefore, combining with the deep in-situ environment, it is of great significance to propose a calculation and analysis method for the deformation behavior of rock mass under excavation disturbance stress path, which...
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IPC IPC(8): G01N3/02G01N3/12G01N29/14
Inventor 高亚楠兰东昊张玉栋王云龙丁峰郭鹏高峰
Owner CHINA UNIV OF MINING & TECH