Failure Evolution and Instability Mechanism of Surrounding Rock for Close-Distance Parallel Chambers with Super-Large Section in Deep Coal Mines

Liu, Xuesheng; Fan, Deyuan; Tan, Yunliang; Song, Siyuan; Li, Xianfeng; Ning, Jianguo; Gu, Qingheng; Ma, Qing

doi:10.1061/(asce)gm.1943-5622.0001998

Cited by 58 publications

(43 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…According to the actual situation of the 25070 working face in the Xuehu coal mine, the face-to-gob distance of the hydraulic support is 5.2 m and the width of hydraulic support is 1.43 m. e thickness of the immediate roof is 8 m, and the volume weight of the immediate roof is 0.025 MN/ m 3 . e compaction coefficient of the immediate roof is 1 GPa, and the compaction index of the immediate roof is 3.…”

Section: Shock and Vibrationmentioning

confidence: 99%

“…Because the roof is not well supported, it is prone to the overall sliding of the overlying strata and impact on the retracement channel, resulting in the coal rock dynamic disaster. erefore, reasonable excavation and support technology is particularly important [3][4][5]. Generally, the layout methods of retracement channels used in coal mines include the preexcavation double retracement channel [6][7][8], pre-excavation single retracement channel [8,9], and no pre-excavation retracement channel [10,11].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Stability and Control of Retracement Channels in Thin Seam Working Faces with Soft Roof

Qin

Zhang

et al. 2021

Shock and Vibration

View full text Add to dashboard Cite

To reduce the risk of roof falling and rib spalling during equipment retracement in thin coal seam faces with soft roofs, the 25070 working face of Xuehu Coal Mine was taken as the research object, and theoretical analysis, numerical simulation, and field practice methods were used. Under different space relationships between retracement channels and main roof fracture, the load of hydraulic supports was quantitatively analyzed. The relationship between the working resistance of the hydraulic support and the sinking rotation angle of the immediate roof was analyzed, and a reasonable time for the arrangement of the retracement channel was determined. The sublevel excavation technology and the combined support technology of roof anchor cables and coal rib anchors were proposed. The field application shows that the falling height and rate of movable prop of the hydraulic supports, working resistance of the hydraulic supports, and the roof subsidence all meet the requirements of safety production during the terminal mining period, and the surrounding rock control effect of retracement channel was determined to be good. The safe and efficient mining of the coal mine is ensured, and the research results can provide guidance for similar working faces.

show abstract

Section: Shock and Vibrationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Stability and Control of Retracement Channels in Thin Seam Working Faces with Soft Roof

Qin

Zhang

et al. 2021

Shock and Vibration

View full text Add to dashboard Cite

show abstract

“…With the continuous improvement of coal mining methods and the enhancement of the mechanical equipment level, fully mechanised caving has become an important mining method for thick coal seam [1][2][3]. It can achieve high-yield and high-efficiency mining of thick coal seams, but roadways in mining area face challenges of surrounding rock control, for example, the large cross section, strong mining influence, and soft and thick coal roof and floor [4][5][6][7]. Over the past few years, China has called for the construction of resource-saving mines [8].…”

Section: Introductionmentioning

confidence: 99%

Width Design of Small Coal Pillar of Gob‐Side Entry Driving in Soft Rock Working Face and Its Application of Zaoquan Coal Mine

Ai¹

2021

Advances in Civil Engineering

View full text Add to dashboard Cite

Reasonable width of gob-side coal pillar can reduce the waste of coal resources and is conducive to roadway stability. According to the distribution of internal and external stress fields at the working face, a method for determining the width of gob-side coal pillar was proposed. The coal pillar and roadway should be set within the internal stress field, and support is provided through the anchored part and the intact part of the coal pillar. The method was used in the design of the coal pillar at No. 130205 working face of Zaoquan Coal Mine. The calculation results indicated that the width of a coal pillar suitable for gob-side entry is 6.0 m. It is reasonable to arrange the roadway and coal pillar in the low-stress zone with a width of 11 m. During tunnelling of roadway and stoping of the working face, the deformation of the roadway increased with a reduction in the distance from the working face. Even during stoping of the working face, there was an approximately 1.5 m intact zone in the coal pillar. This indicates that the proposed method of designing small coal pillar of gob-side entry driving is reliable.

show abstract

“…As economic development increases the demand for energy and shallow coal resources are gradually depleted, coal mining is forced into the deep underground [1][2][3][4][5][6]. In deep mining, the geological and geostress environment of the coal becomes more complicated and varied.…”

Section: Introductionmentioning

confidence: 99%

Progressive Damage Process and Failure Characteristics of Coal under Uniaxial Compression with Different Loading Rates

Zhu

Luo

et al. 2021

Shock and Vibration

View full text Add to dashboard Cite

To study the effect of loading rate on the progressive damage and failure characteristics of coal, an ultrasonic detector and a camera were used to measure the P-wave velocity and record the failure process of cuboid coal samples in uniaxial compression tests with five loading rates. The mechanical properties, damage process, and failure characteristics of the samples were analysed, and the mechanism of the advancing velocity of the working face in coal failure was discussed. The results show that, as the loading rate increases, the peak strength of the sample generally shows an increasing trend, but the elastic modulus changes irregularly. The sample is more prone to local failure before the peak strength. An increase in the loading rate rapidly promotes damage in the sample and accelerates the transition from internal damage to macroscopic failure, with no obvious effect on the ratio of damage threshold to corresponding peak strength. At low loading rates, the samples mainly experienced static failure; the failure form was spalling, and the failure range was wide. At high loading rates, the samples were prone to dynamic failure in the local area, manifested as the ejection of slabs and debris. A greater loading rate produced smaller and thinner slabs and a greater ejection velocity. Properly increasing the advancing velocity of the working face is conducive to reducing spalling to prevent large-area roof fall, but it may increase the possibility of coal burst in local areas. The results of this study provide a reference for roof control and coal burst disaster prevention on the working face in deep coal mining.

show abstract

Failure Evolution and Instability Mechanism of Surrounding Rock for Close-Distance Parallel Chambers with Super-Large Section in Deep Coal Mines

Cited by 58 publications

References 37 publications

Stability and Control of Retracement Channels in Thin Seam Working Faces with Soft Roof

Stability and Control of Retracement Channels in Thin Seam Working Faces with Soft Roof

Width Design of Small Coal Pillar of Gob‐Side Entry Driving in Soft Rock Working Face and Its Application of Zaoquan Coal Mine

Progressive Damage Process and Failure Characteristics of Coal under Uniaxial Compression with Different Loading Rates

Contact Info

Product

Resources

About