A Case Study of Fracture Law and Stress Distribution Characteristics of Surrounding Rock of Working Face in Deep Mines

Shi, Xianfeng; Zhang, Xingkai; Jiang, Fuxing

doi:10.1007/s10706-019-00810-7

Cited by 12 publications

(7 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Characteristics. According to the actual mining situation of the coal seam in the Liuhuanggou coal mine and the actual measured data of surface subsidence, it is known that during the mining period of SIW (9)(10)(11)(12)(13)(14)(15) 08, all the mined-out areas after the mining of 4-5 coal seams are in a non-fully mined state, and the overlying strata of SIW (9)(10)(11)(12)(13)(14)(15) 08 form an asymmetric pressure arch structure [28,29]. With the increasing advancement of the working face, the stress distribution on the coal body roughly shows 4 patterns, as shown in Figure 5.…”

Section: Overburden Spatial Structure and Stress Evolutionmentioning

confidence: 99%

Mechanism and Safety Mining Technology of Overall Instability-Induced Rockbursts of Multi-Coal Seam Spatially Isolated Working Face

Sun

Zhu

Jiang

et al. 2022

Mathematical Problems in Engineering

Self Cite

View full text Add to dashboard Cite

The isolated working face has always been the hardest hit area for the occurrence of rockburst, and the spatially isolated working face with multiple coal seams is often easily overlooked due to its hidden nature, which leads to the occurrence of rockburst accidents. This paper takes the Liuhuanggou coal mine (9–15) 08 isolated working face as the engineering background, used field research, theoretical analysis, numerical simulation, and field monitoring, investigated the coal body stress evolution law during mining, and revealed the overall instability rockburst mechanism of the working face and deduced the limit advance distance when the working face was in a state of boundary instability. The research results show the following: (1) with the increase of advancement, the overlying strata on the working face are dynamically transformed from the “C” spatial structure with hollowing on both sides to the “θ” spatial structure with coal body support in the middle; (2) when the dynamic load stress on the coal body of the working face exceeds 1.5 times its integrated compressive strength, there is a risk of overall instability rockburst; (3) when the working face advances to 430 m from the open cutting, the superimposed stress on the coal body exceeds its comprehensive compressive strength and reaches a critical instability state, which is verified by numerical simulation. Based on the analysis of the mechanics and mechanism of the overall instability rockburst of the working face, this paper proposes a set of targeted safe mining solutions: (1) The joint monitoring system of microseism-stress-drilling cutting is adopted to monitor and warn the dangerous rockburst areas. (2) The “rockburst-gas” drilling technique is used to unload the pressure on both sides of the working face and the coal wall. (3) The mining speed shall not exceed 3.2 m/d when the working face is mined before 350 m, and shall not exceed 2.4 m/d when the working face enters the influence area of mined-out LW(4-5)02 (350∼550 m). The microseismic monitoring results and field practice confirmed the reasonableness and effectiveness of the safe mining technology plan.

show abstract

Section: Overburden Spatial Structure and Stress Evolutionmentioning

confidence: 99%

Mechanism and Safety Mining Technology of Overall Instability-Induced Rockbursts of Multi-Coal Seam Spatially Isolated Working Face

Sun

Zhu

Jiang

et al. 2022

Mathematical Problems in Engineering

Self Cite

View full text Add to dashboard Cite

show abstract

“…Cao et al 17 simulated the change process of the stress field and displacement field of the protective seam during its mining, obtained the displacement and stress change characteristics of the overlying strata during the mining of the lower protective seam, and established an integrated technical scheme of stress relief and gas extraction. Wang et al 18 studied the development height of a gas conducting fracture zone in the gob overlying strata, and the results show that the height of the gas conducting fracture zone is about 65 m. Shi et al 19 confirmed that after the mine enters the deep mining stage, the range of overlying strata movement and the influence distance in front of the working face expanded. Xiong et al 20 monitored the roadway roof bed‐separation during mining of the lower protective seam and studied the displacement and breakage of the roof under the influence of mining.…”

Section: Introductionmentioning

confidence: 99%

Fracture law of different overlying strata in mining of protective seam under close distance coal seam

Wang

Yuan

Gao

et al. 2023

Energy Science & Engineering

View full text Add to dashboard Cite

To study the fracture law of different overlying strata during mining of the lower protective seam under a close distance coal seam at a depth of 1000 m, roof bedseparation and fissure imaging monitoring were carried out in the inlet roadway ahead of the working face of the JI 15 -31040 lower protective seam in the Pingdingshan XII coal mine. The results show that with the overlying strata of the lower protective seam being affected by mining, the displacement of the overlying strata in the roof of 0-4 m was relatively large, and the fissure development was very significant. The displacement of the overlying strata in the roof of 4-12 m was relatively small, the fissures in this range were mostly randomly closed fissures, and this area was stable. Bed separation occurred in the roof of 12-16 m, and the bed-separating fissures were mostly located at the coal-rock junction.During the mining process, the fractal dimension of the roof gradually increased, and the fissure network developed continuously. The changing process of the fractal dimension of the roof can be roughly divided into three typical change areas: less influence area (distance from the working face > 70 m), rapid increase area (15 m < distance from the working face < 70 m), and stable area (distance from the working face < 15 m), and the area within 70 m in front of the working face was the key supporting area. Under the influence of mining, the roof fissures showed an overall change trend of "from zero to some, from short to long, from small to large, and from narrow to wide." This study can provide a reference for mining of the protective seam in deep coal seams.

show abstract

“…The development and utilization of coking coal play a vital role in the development of Chinese coal industry and is an indispensable resource for our economic construction [1][2][3]. For a long time, the mining depth of coking coal is generally lower than that of anthracite [4], and the focus of gas control is mainly on highly metamorphic coal represented by anthracite, and the research on coking coal mining area is less, but with the depletion of shallow coal resources, many mining areas have been transferred to deep mining [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Study on Adsorption Model of Deep Coking Coal Based on Adsorption Potential Theory

Shasha

Wang

Zhang

et al. 2022

Adsorption Science & Technology

View full text Add to dashboard Cite

With the exhaustion of coal resources in shallow coal seams, many mining areas have moved to deep mining, and the coal storage environment is obviously affected by the mining depth, mainly manifested as the increase of gas pressure and temperature, which makes the adsorption characteristics of deep coal seam gas much more complicated than shallow coal seam. Based on this, this paper chooses Pingdingshan coking coal as the research object, using Hsorb-2600 high-temperature and high-pressure gas adsorption instrument to carry on isothermal adsorption experiment. According to the adsorption theory and the uniqueness of the adsorption characteristics cure, the adsorption model was analyzed and studied. The results show that the predicted curve of coal seam gas adsorption isotherm is in good agreement with the measured curve, the relative error is less than 10%, and the adsorption characteristic curve is logarithmic. At the same time, the model is used to study the variation of adsorbed gas amount with mining depth. The results show that the adsorbed gas amount increases first and then decreases with coal burial depth.

show abstract

A Case Study of Fracture Law and Stress Distribution Characteristics of Surrounding Rock of Working Face in Deep Mines

Cited by 12 publications

References 5 publications

Mechanism and Safety Mining Technology of Overall Instability-Induced Rockbursts of Multi-Coal Seam Spatially Isolated Working Face

Mechanism and Safety Mining Technology of Overall Instability-Induced Rockbursts of Multi-Coal Seam Spatially Isolated Working Face

Fracture law of different overlying strata in mining of protective seam under close distance coal seam

Study on Adsorption Model of Deep Coking Coal Based on Adsorption Potential Theory

Contact Info

Product

Resources

About