In-situ stress measurements in underground coal mines and study on stress fields

Kang, Huan; Si, Lina; Zhang, X.

doi:10.1201/9780415601658-24

Cited by 5 publications

(7 citation statements)

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“…The maximum horizontal primary stress was 29.35 MPa, the minimum horizontal primary stress was 17.04 MPa, and the vertical primary stress was 11.02 MPa. According to the research results of Kang et al 32 on in‐situ stress, the in‐situ stress of Heiyanquan Coal Mine was between 18 and 30 MPa, which was a high‐stress area. The ratio of the measured maximum horizontal stress to the theoretically calculated horizontal stress ranged from 3.98 to 10.09, which indicated that it was under the influence of the more obvious horizontal tectonic stress.…”

Section: Resultsmentioning

confidence: 95%

Research on deformation characteristics and control technology of surrounding rock for gob‐side entry with small coal pillar in gently inclined coal seam

Wang,

Zhou,

Zhang

2024

Energy Science & Engineering

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With the engineering background of the gob‐side entry of panel SA1104 in Heiyanquan Coal Mine, the deformation characteristics and control technology of the surrounding rock for gob‐side entry with small pillar in gently inclined coal seam have been studied by field observation, numerical simulation, and theoretical analysis. The study show that: (1) The surrounding rock has obvious asymmetric deformation characteristics, the roof subsidence on the solid coal side is larger than that on the small coal pillar side; the deformation of small coal pillar side rib is more significant than that of the solid coal side rib, which is concentrated in the middle and upper part, and slip deformation occurs at the upper sharp corner; the middle part of solid coal side rib exhibits prominent deformation; and floor heave is shifted to the small coal pillar side. (2) The stress concentration zone on the small coal pillar side is located 1.9 m from the high rib, while the stress concentration zone on the solid coal side is located 4.1 m from the low rib. The difference in the rib‐to‐rib peak stress is 4.2 MPa, and the stress concentration on the solid coal side is larger than that on the small coal pillar side. (3) Poor physical and mechanical properties of the surrounding rock, high in‐situ stress, and high deterioration degree of the surrounding rock structure are the main internal causes of the entry deformation; strong mining disturbance, arbitrary support parameters, and large section sizes are the main external causes of the entry deformation. (4) The asymmetric combined support program is proposed, featuring “non‐equidistant cable + inclined bolt on the roof, bolt extension + cable supplement on the small coal pillar side rib, and bolt encryption on the solid coal side rib”, and it had a positive on‐site application effect.

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Section: Resultsmentioning

confidence: 95%

Research on deformation characteristics and control technology of surrounding rock for gob‐side entry with small coal pillar in gently inclined coal seam

Wang,

Zhou,

Zhang

2024

Energy Science & Engineering

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“…In order to analyze the difference of primary stress characteristics between deep mining and shallow mining in Ordos, the in situ stress data of 9 shallow mines in Ordos are obtained through field measurement and investigation [20]. The results are shown in Table 1.…”

Section: Primary Stress Characteristics Of Ordos Deep Mining Areamentioning

confidence: 99%

Coal Burst Prevention Technology and Engineering Practice in Ordos Deep Mining Area of China

Pan

Liu

Zhang³

et al. 2022

Sustainability

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With the coal mines in western China entering the field of deep mining, the problem of coal burst is becoming more and more serious. According to the characteristics of deep mining, it is an urgent problem that requires the development of an efficient and reasonable coal burst prevention and control plan to guide project practices. This study takes the typical deep mining area in Ordos as the research background, according to the stress state of the coal mining area and the load form of induced coal burst, which, in Ordos deep mining, is divided into the typical and atypical type. The former is caused by the superposition of high in situ stress and strong mining-induced stress, while the latter is due to the combination of high in situ stress, strong mining-induced stress, and external stress disturbances. Combined with theoretical analysis, numerical simulation, and field measurement, it is shown that the stress level of the Ordos deep mining area is higher than that of the shallow original rock, and the difference of the three-dimensional stress between coal and rock mass is greater. The concentration degree and influence range of mining-induced stress obviously increase. Coal and rock mass are more prone to instability and failure due to external disturbances. Based on the stress control theory, the prevention and control strategies of coal burst in different types of deep mining are put forward. In addition, the prevention and control technology system of coal burst in the Ordos deep mining area is established. The field engineering practice has been carried out to realize the efficient prevention and control of coal burst.

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“…Therefore, the knowledge of in-situ stress distribution in the coal-rock masses in the study area is necessary for the theoretical substantiation of underground mine works and respective decision-making (Sato et al, 2000;Chen et al, 2017;Lavrov, 2003) on such issues as roadway site selection, determination of support parameters, roof control, and prevention and control of mining-related hazards. To this end, an in-situ stress measurement system by smallborehole hydraulic fracturing (SYY-56, China Coal Research Institute, Beijing, China) (Kang et al, 2010;Kang, 2007), was applied in 15 representative roadways deeper than 1 km at the Panxi Coal Mine (PCM), Suncun Coal Mine (SCM), Huafeng Coal Mine (HCM), and Xiezhuang Coal Mine (XCM) within the XMA. The measurement results for each particular roadway are listed in table 1, where D is the burial depth of roadway; σ V is vertical principal stress; σ H max and σ H min are maximum and minimum horizontal principal stresses, respectively; α denotes the direction of maximum horizontal principal stress; k 1 is the ratio of the maximum horizontal principal stress to the vertical one; k 2 is the ratio of the minimum horizontal principal stress to the vertical one; and k 3 is the maximum-to-minimum ratio of horizontal principal stresses.…”

Section: Problems Encountered In the Deep Roadways Excavation In The Xmamentioning

confidence: 99%

Archives of Mining Sciences

Zhang,

Tang,

Zhang

et al. 2020

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Finding effective ways to efficiently drive roadways at depths over 1 km has become a hotspot research issue in the field of mining engineering. In this study, based on the local geological conditions in the Xinwen Mining Area (XMA) of China, in-situ stress measurements were conducted in 15 representative deep roadways, which revealed the overall tectonic stress field pattern, with the domination of the horizontal principal stresses. The latter values reached as high as 42.19 MPa, posing a significant challenge to the drivage work. Given this, a comprehensive set of innovative techniques for efficiently driving roadways at depths over 1 km was developed, including (i) controlled blasting with bidirectional energy focusing for directional fracturing, (ii) controlled blasting with multidirectional energy distribution for efficient rock fragmentation, (iii) wedge-cylinder duplex cuts centered on double empty holes, and (iv) high-strength supports for deep roadways. The proposed set of techniques was successfully implemented in the -1010 west rock roadway (WRR) drivage at the Huafeng Coal Mine (HCM). The improved drivage efficiency was characterized by the average and maximum monthly advances of 125 and 151 m, respectively. The roadway cross-sectional shape accuracy was also significantly improved, with the overbreak and underbreak zones being less than 50 mm. The deformation in the surrounding rock of roadway (SRR) was adequately controlled, thus avoiding repeated maintenance and repair. The relevant research results can provide technical guidance for efficient drivage of roadways at depths over 1 km in other mining areas in China and worldwide.

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In-situ stress measurements in underground coal mines and study on stress fields

Cited by 5 publications

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Research on deformation characteristics and control technology of surrounding rock for gob‐side entry with small coal pillar in gently inclined coal seam

Research on deformation characteristics and control technology of surrounding rock for gob‐side entry with small coal pillar in gently inclined coal seam

Coal Burst Prevention Technology and Engineering Practice in Ordos Deep Mining Area of China

Archives of Mining Sciences

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