Application of underground microseismic monitoring for ground failure and secure longwall coal mining operation: A case study in an Indian mine

Ghosh, G. K.; Cherukuri, Sivakumar

doi:10.1016/j.jappgeo.2018.01.004

Cited by 79 publications

(41 citation statements)

References 19 publications

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“…where E 1 is the EIR elastic modulus, MPa; I 1 = h 3 /12 is the EIR inertia moment, m 4 ; k m is the elastic foundation coefficient of the coal seam. Substituting Equation 18into Equations (6) and 7, the EIR deflection y , M x , and Q x equations can be obtained:…”

Section: Mechanical Model Of Eir Advanced Breaking Positionmentioning

confidence: 99%

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Research on the Roof Advanced Breaking Position and Influences of Large Mining Height Working Face in Shallow Coal Seam

Huang

2020

Energies

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The large mining height (LMH) in shallow coal seam has been widely applied in the Shenfu coalfield, China. The dynamic load is obvious, and the rib spalling is serious when the LMH working face concerns roof weighting. The advanced breaking position of the roof affects the strength of the ground pressure when the roof is broken. Firstly, based on a large number of actual measurements and physical simulation experiments, the rock formation in the fall zone, where the articulated structure cannot be articulated between the coal seam and the main roof, is called the equivalent immediate roof (EIR). When the mining height increases, the thickness of the EIR increases non-linearly. Next, based on the theory of “elastic foundation beam”, a mechanical model for the advanced breaking of the roof is established in shallow coal seam, and the calculation equation for the advanced breaking position of the roof is given; then, designed and carry out boreholes of the no. 22201 working face in the Zhangjiamao Coal Mine. The theoretical calculation of key strata results (5.6–6.9 m) are in the range of field measurement results (5–8 m). According to the field measurement results, the roof movement of the LMH working face is ahead of the roof weighting. Finally, we define the thickness of EIR and the mining height ratio as the immediate mining ratio ki, which affects the degree of filling of the goaf and determines the structural form of the main roof. When the ki is small, the goaf is fully filled; when the ki is large, the goaf is fully filled. Under the same conditions, different filling rate conditions will form different roof structures. Results of this research can be helpful to control roof weighting and provide early warning of possible safety problems related to the LMH working face in shallow coal seam.

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Section: Mechanical Model Of Eir Advanced Breaking Positionmentioning

confidence: 99%

“…The thickness of coal seam mining is 3.5-8 m. Most of the working faces adopt the mining method of LMH and full mining height [1,2]. The roof structure will show the different strength of ground pressures before and after the fracture [3][4][5][6][7]. The roof fracture intervals depend on different boundary conditions.…”

Section: Introductionmentioning

confidence: 99%

Research on the Roof Advanced Breaking Position and Influences of Large Mining Height Working Face in Shallow Coal Seam

Huang

2020

Energies

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“…where ' a is the distance from the fracture site of the roof to the edge of the gob-side roadway, in m. Simultaneously with Equations (6), (7), and (11), the temporary support strength in the roadway can be obtained.…”

Section: Fracture Analysis Of the Main Roof Above The Roadwaymentioning

confidence: 99%

“…With the reduction of coal resources, there are problems in traditional underground coal mining, such as unaffordable driving costs, large surface disturbances, low coal-extraction rates, and the frequent occurrence of safety accidents. Such issues have also been addressed in the literature [4][5][6][7]. Following the development path of environment-friendly, safe, high-efficient, non-pillar mining technology, it has been widely used in coal mining.…”

Section: Introductionmentioning

confidence: 99%

Stability Analysis of the Entry in a New Mining Approach Influenced by Roof Fracture Position

Yang

Wang

et al. 2019

Sustainability

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Non-coal pillar mining with roadway formed automatically (RFANM) is a new mining approach, which demonstrates revolutionary significance because it does not require making roadway before mining and coal pillar retaining. In order to explore the stability of the surrounding rock structure in RFANM, the deformation of the surrounding rock was theoretically analyzed and simulated based on three different fracture positions of the main roof. It was concluded that reasonable control of temporary support strength in roadway is of great importance to control the deformation of the entry. The deformation process of surrounding rock under different fracture positions in RFANM was simulated by using the Universal Discrete Element Code (UDEC). The results of the numerical simulation showed that the main roof was fractured at the solid coal side or gob side; the deformation of the roadway was small. The fracture condition of the main roof at the gob side required a higher effect of roof slitting or temporary support from the roadway. Through drilling and peeping at the retained roadway, it was judged that the main roof was broken inside the coal wall. Field monitoring results revealed that the deformation of the roadway can be effectively controlled.

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“…MS monitoring technique has begun to be applied to the coal mines since 1984 in China, 14 which is normally used for early warning and water inrush monitoring, [14][15][16] as well as recently for gasification. 17 Many researches have been conducted on MS monitoring in coal mines for several years, and a number of practical applications with a self-developed MS monitoring system have been performed.…”

Section: Introductionmentioning

confidence: 99%

Underground microseismic monitoring of a hydraulic fracturing operation for CBM reservoirs in a coal mine

Jiang

et al. 2019

Energy Science & Engineering

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Hydraulic fracturing can evidently improve the coalbed methane production in underground coal mines, but it is difficult to delimit the stimulated area accurately. In order to evaluate the stimulated area, microseismic (MS) monitoring technique is proposed to investigate the seismic responses of the induced fractures of hydraulic fracturing. Three coal seams were targeted to be treated in a coal mine. An array of geophones was set along the underground roadway to detect the MS signals caused by HF. In order to verify the result of MS monitoring, water content of each coal seam has been measured before and after HF treatment. The results showed that a series of MS events were detected during the entire HF process, and a sharp MS event usually occurred during the first hour of HF process. The energy of the sharp MS event had higher magnitude than others. The MS distribution exhibited complex morphological features. The directionless MS response was distributed over a radius of less than 40 m but tended to be significantly conjugated with a radius of more than 40 m. HF could stimulate both the coal seam and the rock layers nearby. The achievable stimulated area in the coal seam was determined to be 50 m × 50 m according to the MS density and water content. The stimulated area in terms of MS density was easily found to be broader than the area of water direct intrusion. The present study indicated that MS monitoring technique could potentially be used for evaluation of HF in underground coal mine.

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Application of underground microseismic monitoring for ground failure and secure longwall coal mining operation: A case study in an Indian mine

Cited by 79 publications

References 19 publications

Research on the Roof Advanced Breaking Position and Influences of Large Mining Height Working Face in Shallow Coal Seam

Research on the Roof Advanced Breaking Position and Influences of Large Mining Height Working Face in Shallow Coal Seam

Stability Analysis of the Entry in a New Mining Approach Influenced by Roof Fracture Position

Underground microseismic monitoring of a hydraulic fracturing operation for CBM reservoirs in a coal mine

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