Hybrid assessment of pre-blasting weakening to horizontal section top coal caving (HSTCC) in steep and thick seams

Lai, Xingping; Shan, Pengfei; Cao, Jiantao; Sun, Huihui; Suo, Zhengyong; Cui, Feng

doi:10.1016/j.ijmst.2013.12.006

Cited by 27 publications

(23 citation statements)

References 13 publications

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“…The Weihuliang coal mine is located in the pre-Cenozoic strata, approximately centered at the city of Urumchi. Insitu geological and physical settings of the case study are totally distinct (Lai et al 2014). Fierce crushing stress is a crucial characteristic of tectonic stress and the seismic mechanism is mainly influenced by fracture of a thrust fault.…”

Section: In-situ Geological and Mining Settingsmentioning

confidence: 99%

“…Generally, the length of the working face is shorter than the maximum length of 50.0 m, and the multi-narrow mine voids are above the mechanized SSTCC workings. Hence, the variability of stress and deformation in ESTCS are different from that of LTCC in gently inclined coal seams (Lai et al 2014;Cao et al 2011;Miao et al 2011).…”

Section: Introductionmentioning

confidence: 99%

“…In complicated geological and mining settings, coal-rock masses of mine voids that fail after coal mining may be induced by the hybrid physical-mechanics coupling effects of tectonic stress, excavation disturbed stress, and seismic forces (Alehossein and Poulsen 2010;Lai et al 2014). Under such high stress-disturbances, asymmetric deformation of coal-rock masses in mine voids is significantly different in ESTCS (Kose and Tatar 1997;Lai et al 2009a, b).…”

Section: Introductionmentioning

confidence: 99%

“…There have been numerous efforts to solve the relative hazards of dynamic rock mass destabilization with various methods (Lai et al 2014). However, previously published literature on the destabilization characteristics of surrounding rock mainly focused on understanding the destabilization mechanisms of LTCC that are involved in slope-stress analysis, hazard-control design, and optimization and policy-making (Yasitli and Unver 2005).…”

Section: Introductionmentioning

confidence: 99%

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Simulation of Asymmetric Destabilization of Mine-void Rock Masses Using a Large 3D Physical Model

et al. 2015

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When mechanized sub-horizontal section top coal caving (SSTCC) is used as an underground mining method for exploiting extremely steep and thick coal seams (ESTCS), a large-scale surrounding rock caving may be violently created and have the potential to induce asymmetric destabilization from mine voids. In this study, a methodology for assessing the destabilization was developed to simulate the Weihuliang coal mine in the Urumchi coal field, China. Coal-rock mass and geological structure characterization were integrated with rock mechanics testing for assessment of the methodology and factors influencing asymmetric destabilization. The porous rock-like composite material ensured accuracy for building a 3D geological physical model of mechanized SSTCC by combining multi-mean timely track monitoring including acoustic emission, crack optical acquirement, roof separation observation, and close-field photogrammetry. An asymmetric 3D modeling analysis for destabilization characteristics was completed. Data from the simulated hydraulic support and buried pressure sensor provided effective information that was linked with stress-strain relationship of the working face in ESTCS. The results of the 3D physical model experiments combined with hybrid statistical methods were effective for predicting dynamic hazards in ESTCS.

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Section: In-situ Geological and Mining Settingsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Simulation of Asymmetric Destabilization of Mine-void Rock Masses Using a Large 3D Physical Model

et al. 2015

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“…The group analyzed changing characteristics of overburden load to obtain the deformation characteristics of the roof and proposed a method for coupling cracking and disaster reduction. Mine filling and mining methods are classified according to filling position, power, materials, and filling volume [25][26][27][28][29][30]. The authors of this paper have long been committed to disaster prevention and control for steeply inclined coal seams [31,32].…”

Section: Introductionmentioning

confidence: 99%

Research on Reducing Mining-Induced Disasters by Filling in Steeply Inclined Thick Coal Seams

et al. 2019

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Surface filling during the mining of steeply inclined thick coal seams is an efficient method for restraining disasters caused by the cascading movement of overburden rocks. This study aims to control rock damage during the mining of thick coal seams steeply inclined at typically more than 45° in fully mechanized coal caving work surfaces with high section heights. Based on the green mining concept, we analyzed the movement of roof strata after filling using multiple methods, including field investigation, theoretical analysis, numerical calculation, and field monitoring. Results show that, in dynamic mine disasters caused mainly by complex coal conditions and strong disturbances in fully mechanized coal caving in large sections, the strength of the filling material is dependent on the features of the surrounding rock and burial depth. Also, the mining-induced peak stress shows a linear increase after filling, with the goafs in stress-free conditions, and failure zones occur in the roof and floor strata after mining. The stability of the rock pillars and overburden strata are better, and there are no large-scale tensile fissures in the ground surface. We adopted an intelligent underground radar detection technique that can reflect the rock-failure characteristics through the propagation characteristics of the electromagnetic spectrum. The detection results show that the coal goafs were filled properly as they were matched with the caving roof, which will collapse along with the release of the top coal, with the filling body able to move downward along with the discharge of top coal. The use of surface filling can restrain the dynamic disaster induced by a fully mechanized coal caving surface with a large section when mining steeply inclined thick coal seams, thereby ensuring safety and promoting the use of green mining practices.

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An acoustic wave method for evaluating the effectiveness of blast to enhance fragmentation in longwall top coal caving

Zhao

Zhou

Gao

2021

Energy Science & Engineering

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Longwall top coal caving (LTCC) mining is the most efficient method to extract thick or extra-thick coal seam and extensively used in western China. [1][2][3][4][5] With high productivity and efficiency, LTCC mining plays an ultimate important role in the development and reform of the traditional coal mining method. The prototype of LTCC could date back to the 1960s and 1970s, when some European countries, especially the French and Yugoslavia, used the total soutirage method to extract thick and irregular coal seams. 6 The poor recovery has been a major problem for the early soutirage longwall caving mining. 7 In the early 1980s, LTCC mining was first introduced in China. 5,8,9 Since then, with significant modifications and improvements, the LTCC mining method has experienced rapid development and achieved great success in China. 8 In addition, the past few years have witnessed a series of successful applications of LTCC mining in Australia, India, Russia and so on. 2,[10][11][12] In LTCC mining, the recovery ratio and the mining efficiency depend on fragmentation and caving of the top

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Hybrid assessment of pre-blasting weakening to horizontal section top coal caving (HSTCC) in steep and thick seams

Cited by 27 publications

References 13 publications

Simulation of Asymmetric Destabilization of Mine-void Rock Masses Using a Large 3D Physical Model

Simulation of Asymmetric Destabilization of Mine-void Rock Masses Using a Large 3D Physical Model

Research on Reducing Mining-Induced Disasters by Filling in Steeply Inclined Thick Coal Seams

An acoustic wave method for evaluating the effectiveness of blast to enhance fragmentation in longwall top coal caving

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