Abstract
Current energy to “release” after accumulating + first for the mechanism of rock bursts occurred in analysis of the strategy is accepted by many scholars, based on the existing means of prevention and control of percussive ground pressure, from the angle of the prevention and control of design of the mechanism of impact ground pressure energy regulation, namely, “weakened after the first release +” softened water injection measures and “lead after the first release +” drilling pressure relief measures, for the study of mining under the action of a strong shock tendentiousness rock energy regulatory mechanism; based on rock mechanics experiment, the analysis under different modification measures should be variant energy storage mechanisms of induced damage evolution of rock energy. The mechanism of energy evolution in the modification of strong bursting liability roof rock is revealed. The results show that different modification regulation measures can effectively change the physical and mechanical parameters of target rock samples and realize “hard rock softening or soft rock hardening.” Samples under different modification measures are classified as initial consolidation stage, elastic stage, stage of plastic deformation, yield failure stage, and late stage, the energy evolution is roughly the same as the sample complete natural condition, but the yield failure stage and the destruction of late stage have an obvious difference, which provides favorable conditions for impact ground pressure to prevent. With the help of three characteristic energy indexes of total strain, elastic strain energy, and dissipative strain energy of rock samples, the evolution law of energy indexes under different modification control measures is analyzed. The index of elastic energy consumption ratio is introduced as a precursor feature of rock instability and failure, which indicates the rock impact tendency to a certain extent. The energy regulation mechanisms of “first release+then weakening” water injection softening measures and “first release+then guidance” drilling pressure relief measures are explained theoretically, respectively. However, we should focus on the defects of the corresponding control measures and finally try to make a reasonable combination of different modification measures. Finally, the gradient pressure relief scheme should be considered in order to avoid large stress drop caused by large-scale pressure relief in the region and aggravate the instability of rock mass. The instability of rock mass is further aggravated.
Highlights
The gradient pressure relief scheme should be considered in order to avoid large stress drop caused by large-scale pressure relief in the region and aggravate the instability of rock mass. e instability of rock mass is further aggravated
In order to better explain the energy regulation mechanism of rock burst, this paper takes different in situ modification methods as examples to carry out experiments. rough two parallel test ideas, i.e., drilling with different water content and different pore diameters, the mechanical characteristics and parameters of coal and rock samples under different modified conditions under single bearing load are analyzed by means of the indoor uniaxial compression test
Compared with the control group, the average peak strength of the rock sample decreased by 11.1% and 41.2%, respectively. e average peak strain increased by 22.1% and decreased by 7.4%, respectively. e mean modulus of elasticity decreased by 64.6% and 47.5%, respectively
Summary
E research in this paper focuses on two commonly used pressure relief measures, involving water injection softening and large diameter pressure relief drilling, and further reveals the specific modification and regulation mechanism, which can guide the determination of existing empirical parameters and ensure the accuracy of engineering scale to prevent and control rock burst. In order to better explain the energy regulation mechanism of rock burst, this paper takes different in situ modification methods (water injection softening and borehole pressure relief ) as examples to carry out experiments. Stress-Strain Curves of Bearing Specimens with Different Modification Regulation Measures
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