Abstract
In this study, the stress relief method of hollow inclusion and mathematical-statistical analysis are used to study the in situ stress distribution law of the Guotun coal mine, and the optimization strategy of roadway support is put forward. The test site is located in the city of Heze, Shandong Province, China. The main conclusions included the following: (1) among the three large-scale tectonic movements experienced by the Guotun coal mine, the middle Yanshan period has the strongest impact on it. According to the geological evolution process, it is preliminarily inferred that the maximum principal stress direction of the Guotun coal mine is northwest by west to southeast by east (NWW∼SEE). (2) Compared with the surrounding mines, the average value of the maximum principal stress in the Guotun coal mine is slightly higher, and there is a significant difference in the direction of in situ stress. The arc structure within the mine is the main reason for the deflection of the stress direction. (3) The lateral pressure coefficients KH, Kh, and Kav show a nonlinear distribution with increased depth, and the three coefficients have a decreasing trend. The value of the stress gradient in the Guotun coal mine is greater when it is compared with the surrounding mines. (4) Field tests show that the new strategy proposed in this study is effective, which provides a good reference for engineering practice under similar geological conditions.
Highlights
A number of studies have been conducted to investigate in situ stress measurement methods and equipment, field measurement, and its distribution law in China
Engineering Geology Conditions. e Guotun coal mine is located in 3∼17 km south of Yuncheng county in Heze city, Shandong Province, and the mine center is about 10 km away from Yuncheng county
Evolution Law of the Geological Structure and Principal Stress Direction Analysis. e geological structure of the Guotun coal mine is mainly controlled by the Juye mining area
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]. Kang et al [9] presented a smallaperture hydraulic fracturing in situ stress measurement method and applied it in Luan, Jincheng, Fenxi, and other mining areas in China. Yang et al [13] analyzed the stability of the hydrocarbon wells, by measuring the value of Geofluids the in situ stress in the South Pars field All these studies have improved our understanding of the in situ stress measurement and its engineering application. E first is the mechanical method based on the measurement of strain and deformation in the rock mass, such as the stress recovery method, stress relief method, and hydraulic fracturing method.
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