Abstract
The variation of the in situ stress state is closely related to various factors. In situ stress state is also an important indicator to guide mining production. The study of in situ stress measurement and its distribution characteristics has always been a basic and very important work in mine production. In this study, the deep mines of Linyi Mining Area were considered as the research object. In this regard, the stress distribution law of each mine was studied. We found that the relationship between principal stresses was σH > σv > σh, which belongs to the strike‐slip stress regime. In this stress regime, the lateral Earth pressure coefficient was greater than one, and the magnitude of the three principal stresses all showed an increasing trend with the increase of depth. The maximum horizontal stress direction of the Gucheng Coal Mine, Guotun Coal Mine, and Pengzhuang Coal Mine was NW‐SE under the influence of regional geological structure, while the maximum horizontal stress direction of Wanglou Coal Mine was NE‐SW under the influence of local geological structure. Besides, the relationship between mine in situ stress and mine geological structure, the impact of original rock stress on stope stability, and the effect of original rock stress on floor water inrushing were also investigated. We believe that the research results are beneficial to mine disaster prevention and safety production.
Highlights
Variation of the in situ stress state is closely related to engineering geological hazards, sliding instability of crustal fracture, earthquake preparation, etc. e study of in situ stress measurement and its distribution characteristics has always been a basic and very important task in rock mechanics and geodynamics. e measured in situ stress data can directly reflect the characteristics of the regional in situ stress field and the distribution characteristics of the in situ stress in the engineering area and can determine the properties of engineering rock mass for stability analysis of surrounding rock and support structure design
To fully grasp the distribution characteristics of the current in situ stress field and stress accumulation level in Shandong, this study considered the deep mines of Linyi Mining Area in Shandong as an example to examine the correlation between the stress distribution law of a deep mine and its disaster prevention
Based on forming and adjusting factors of the stress field in the base areas, the in situ stress field could be divided into the gravity stress field dominated by the gravity of rock mass, the tectonic stress field dominated by tectonic movement, and the local stress field formed by adjusting factors
Summary
Variation of the in situ stress state is closely related to engineering geological hazards, sliding instability of crustal fracture, earthquake preparation, etc. e study of in situ stress measurement and its distribution characteristics has always been a basic and very important task in rock mechanics and geodynamics. e measured in situ stress data can directly reflect the characteristics of the regional in situ stress field and the distribution characteristics of the in situ stress in the engineering area and can determine the properties of engineering rock mass for stability analysis of surrounding rock and support structure design. Variation of the in situ stress state is closely related to engineering geological hazards, sliding instability of crustal fracture, earthquake preparation, etc. E study of in situ stress measurement and its distribution characteristics has always been a basic and very important task in rock mechanics and geodynamics. The in situ stress state is closely related to the slip instability of fault structures and earthquake preparation. China and abroad have conducted in-depth studies regarding the in situ stress state in different regions of the world based on the measured in situ stress data, making the characteristics of the in situ stress field in the shallow crust more and more clear [1]. E stress relief method is a welldeveloped in situ stress measurement technology, which has been broadly used in recent years [12] The in situ stress measurement methods are mainly divided into two categories: direct method and indirect method [6]. e direct method of measurement predominantly includes the flat Jack method, hydraulic fracturing method, and acoustic emission method, while the indirect method of measurement mostly includes strain recovery method, borehole caving method, and sleeve hole stress relief method [7,8,9,10,11]. e stress relief method is a welldeveloped in situ stress measurement technology, which has been broadly used in recent years [12]
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