日月引潮力对冲击地压的触发机制及时间窗口效应研究

doi:10.13722/j.cnki.jrme.2021.0463

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Abstract The“time-space”characteristics of rock bursts are difficult to predict，which severely restricts the safe and efficient output of coal resources. Starting from the mechanism of the sun-moon tidal force on the cyclic loading and unloading of the surrounding rock，the temporal and spatial distribution characteristics of typical rock burst accidents from 2001 to 2021 were calculated. The internal relationship between the sun-moon tidal force and rock burst has been clarified using theoretical analysis and data statistics. The trigger mechanism of the two time-history action modes of sun-moon tidal force on rock burst has been studied through cellular automata analysis software(CASRock). A method for optimizing rock cyclic loading and unloading stress paths based on the time window effect was proposed. The research results show that：(1) both the sun-moon tidal force and the occurrence of rock bursts have obvious regional differences. Under the cyclic loading and unloading of the sun-moon tidal force， the occurrence time of rock bursts was mainly concentrated in February and September and around the first and fifteenth days of the lunar calendar. (2) The cumulative acoustic emission quantity，equivalent plastic shear strain(Epstn)，and rock fracture degree(RFD) under the two time-history action modes of the sun-moon tidal force are all greater than conventional triaxial loading. It shows that under the action of sun and moon tidal forces，coal and rock masses are more prone to stress fall，transform from elasticity to plasticity and release more elastic energy，and it is easier to induce rock bursts. (3) Starting from the source of impact force，the two time-history action modes of sun-moon tidal force are easy to induce gravity-type rock burst and structural stress-type rock burst respectively. (4) It is revealed that the trigger mechanism of the sun-moon tidal force on rock burst is actually the result of the repeated cyclic loading and unloading of the surrounding rock. Based on the analysis of common cyclic loading and unloading stress paths，combined with the mine work system，the production period was divided into the loading phase，and the maintenance period was divided into the unloading phase. The stress path of the surrounding rock based on time effect optimization was proposed. The above research results can be better applied to rock mechanics experiments，and provide a new method for real reaction to the rock burst failure law of coal and rock samples under the action of the mining stress path.

Key words： mining engineering sun-moon tidal force rock burst CASRock cyclic loading and unloading stress path

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	CUI Feng1
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	ZHANG Tinghui1
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Cite this article:

CUI Feng1,2,3, et al. Research on the trigger mechanism and time window effect of rock burst subjected to sun-moon tidal force[J]. , 2021, 40(S2): 3107-3117.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0463 OR http://rockmech.whrsm.ac.cn/EN/Y2021/V40/IS2/3107

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