Abstract
This paper presents an integrated approach for mathematical statistics, theoretical analysis, and a field test to investigate the distribution law of in-situ stress and its engineering practice of rock burst control. The test site is located in the Juye mining area, Shandong Province, China. The main conclusions included: (1) There are two types of in-situ stress states in the Juye mining area, σH > σV > σh (42.42%) and σH > σh > σV (57.57%), which are mainly caused by the tectonic stress of the Heze and Fushan faults (The σH, σV, and σh is the maximum principal stress, vertical principal stress or intermediate principal stress and minimum principal stress respectively). (2) The lateral pressure coefficients KH, Kh, and Kav show a non-linear distribution with increased depth, approaching 1.32, 0.96, and 1.41, respectively. The variation range of the horizontal difference stress μd is 0.09–0.58. (3) The average value of the stress gradient is 3.05 MPa/100 m, and the main directions of the maximum horizontal principal stress are northeast–southwest, and northwest–southeast. (4) A new combined supporting strategy, incorporating optimization of roadway layout, anti-impact support system design, and local reasonable pressure relief, was proposed for the rock burst control, and its validity was verified via field monitoring. All these design principles and support strategies for the rock burst control presented in this study can potentially be applied to other similar projects.
Highlights
The objective of this study is to develop a better understanding of the distribution characteristics of in-situ stress in the Juye mining area, and its application in rock burst control
It can be inferred that slip failure is not likely to occur in the Juye mining area under the current stress state
This paper mainly focuses on the distribution law of in-situ stress field in the Juye mining area, and the specific control measures for rock burst prevention are presented
Summary
In-situ stress is the fundamental force that causes the deformation and failure of the surrounding rock in underground caverns, civil buildings, slopes, and other geotechnical engineering structures [1,2]. Due to the higher mining intensity and the more complex distribution of in-situ stress, a large deformation of the deep roadway, damage of the support structure, and even rock burst and other disasters occur frequently [4,5]. Jiang et al [12] established a variety of rock burst models in coal mines and summarized the characteristics, occurrence mechanism, and prevention technologies of rock burst disasters in China All these studies have improved our understanding of the in-situ stress measurement and its relationships with the rock burst control. The current rock burst prevention and control system is not perfect, and some mines in the Juye mining area have an obvious lack of impact resistance All this is due to our lack of a clear understanding of the in-situ stress field in the Juye mining area and a complete set of impact support systems. By studying the stress field environment, we can preliminarily determine the basic conditions of rock burst, so as to prevent rock burst
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