Directional hydraulic fracturing to control hard-roof rockburst in coal mines

Fan, Jun; Li, Dou; He, Hu; Du, Taotao; Zhang, Shibin; Gui, Bing; Sun, Xiaoming

doi:10.1016/j.ijmst.2011.08.007

Cited by 89 publications

(29 citation statements)

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“…However, use of explosives incorporates a lot of issues that need to be properly addressed for the desired result. In the case of deep mining, the difficulties in charging, sealing and controlling misfire are critical [3,4] as those come up with various environmental issues as, ground excitations, generation of dust, air blast, fly rock and back-break [5][6][7][8][9].…”

Section: Explosive Blastingmentioning

confidence: 99%

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An Alternative to Conventional Rock Fragmentation Methods Using SCDA: A Review

2016

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Global energy and material consumption are expected to rise in exponential proportions during the next few decades, generating huge demands for deep earth energy (oil/gas) recovery and mineral processing. Under such circumstances, the continuation of existing methods in rock fragmentation in such applications is questionable due to the proven adverse environmental impacts associated with them. In this regard; the possibility of using more environmentally friendly options as Soundless Chemical Demolition Agents (SCDAs) play a vital role in replacing harmful conventional rock fragmentation techniques for gas; oil and mineral recovery. This study reviews up to date research on soundless cracking demolition agent (SCDA) application on rock fracturing including its limitations and strengths, possible applications in the petroleum industry and the possibility of using existing rock fragmentation models for SCDA-based rock fragmentation; also known as fracking. Though the expansive properties of SCDAs are currently used in some demolition works, the poor usage guidelines available reflect the insufficient research carried out on its material's behavior. SCDA is a cementitious powdery substance with quicklime (CaO) as its primary ingredient that expands upon contact with water; which results in a huge expansive pressure if this CaO hydration reaction occurs in a confined condition. So, the mechanism can be used for rock fragmentation by injecting the SCDA into boreholes of a rock mass; where the resulting expansive pressure is sufficient to create an effective fracture network in the confined rock mass around the borehole. This expansive pressure development, however, dependent on many factors, where formation water content creates a negative influence on this due to required greater degree of hydration under greater water contents and temperature creates a positive influence by accelerating the reaction. Having a precise understanding of the fracture propagation mechanisms when using SCDA is important due to the formation of complex fracture networks in rocks. Several models can be found in the literature based on the tangential and radial stresses acting on a rock mass surrounding an SCDA charged borehole. Those fracture models with quasi-static fracturing mechanism that occurs in Mode I type tensile failure show compatibility with SCDA fracturing mechanisms. The effect of borehole diameter, spacing and the arrangement on expansive pressure generation and corresponding fracture network generation is important in the SCDA fracturing process and effective handling of them would pave the way to creating an optimum fracture network in a targeted rock formation. SCDA has many potential applications in unconventional gas and oil recovery and in-situ mining in mineral processing. However, effective utilization of SCDA in such application needs much extensive research on the performance of SCDA with respect to its potential applications, particularly when considering unique issues arising in using SCDA in different ...

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Section: Explosive Blastingmentioning

confidence: 99%

“…Figure 1 illustrates the expansive compounds generated in the presence of varying ratios of CaO, Al 2 O 3 and SO 3 . According to that, ettringite is generated at point T and Ca(OH) 2 is generated on CaO.…”

Section: Chemical Componentsmentioning

confidence: 99%

An Alternative to Conventional Rock Fragmentation Methods Using SCDA: A Review

2016

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“…In most of them, linear elastic criterion, method of Tensile Stress, method of Brittleness Coefficient and Method of Stresses have been used for rock burst prediction [7,[21][22][23][24][25][26][27][28][29][30][31][32][33][34][35]…”

Section: Rock Burst Predictionmentioning

confidence: 99%

The Dangerous Condition of Ground during High Overburden Tunneling (A Case Study in Iran)

Bagherpour

Rahimdel

2016

Period. Polytech. Civil Eng.

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“…The thick and hard roof breaking has an important effect on the stability of surrounding rocks and coal seam [9,10]. For the stability of coal seam, the previous researches mainly focused on the change of vertical stress of the front coal seam after excavation and judged whether the front coal seam was in a stable state.…”

Section: Introductionmentioning

confidence: 99%

The Breaking Span of Thick and Hard Roof Based on the Thick Plate Theory and Strain Energy Distribution Characteristics of Coal Seam and Its Application

Liu

et al. 2017

Mathematical Problems in Engineering

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In mining engineering, the thick and hard roof threatens the safe production. Based on Reissner plate theory and combined with weighted residual method, with four edges clamped as the boundary conditions, this paper deduces the theoretical formula of the first breaking span of thick and hard roof. Based on Vlasov plate theory, with four edges simply supported as the boundary conditions, this paper deduces the theoretical formula of the periodic breaking span of thick and hard roof. The two formulas are used to verify the breaking span of thick and hard roof of Tashan Coal Mine, proving that its accuracy is higher than that of traditional beam theory. This paper studies the distribution characteristics of strain energy density in front of the coal seam during the mining process by numerical simulation, which is compared with the results of field microseismic experiments. It is found that the strain energy density of the coal seam has a good correlation with the probability of microseismic events. This paper provides theoretical support for more precise calculation of breaking span of the thick and hard roof and technical support for the practical stability analysis of the surrounding rock under the thick and hard roof.

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Directional hydraulic fracturing to control hard-roof rockburst in coal mines

Cited by 89 publications

References 1 publication

An Alternative to Conventional Rock Fragmentation Methods Using SCDA: A Review

An Alternative to Conventional Rock Fragmentation Methods Using SCDA: A Review

The Dangerous Condition of Ground during High Overburden Tunneling (A Case Study in Iran)

The Breaking Span of Thick and Hard Roof Based on the Thick Plate Theory and Strain Energy Distribution Characteristics of Coal Seam and Its Application

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