Study on the disaster reduction mechanism of presplitting blasting and reasonable blasting parameters for shallowly buried remnant pillars

Yuan, Yue; Yuan, Chunlin; Zhu, Cheng; Liu, Han‐xiang; Wang, Sheng‐zhi

doi:10.1002/ese3.468

Cited by 14 publications

(12 citation statements)

References 8 publications

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“…In recent years, some new technologies have been used to control the ground instability during CORP. One of the techniques is to perform presplitting blasting on the coal pillars, thereby eliminating their capacity to support the overburden and relieving the stress concentrations. Yuan et al [6] analysed the blast hole arrangement, the calculation of the charge, etc., and conducted an industrial test in Nanliang coal mine. If the lower-seam working face is threatened by the massive overlying strata, the danger can also be eliminated by deep-hole presplitting blasting on the massive strata [44].…”

Section: Discussionmentioning

confidence: 99%

“…Yuan et al . [ 6 ] analysed the blast hole arrangement, the calculation of the charge, etc., and conducted an industrial test in Nanliang coal mine. If the lower-seam working face is threatened by the massive overlying strata, the danger can also be eliminated by deep-hole presplitting blasting on the massive strata [ 44 ].…”

Section: Discussionmentioning

confidence: 99%

“…When α is approximately equal to zero, the longwall face is orientated perpendicular to the pillar, while when α is approximately equal to 90°, the lower-seam longwall panel advances along the longitudinal direction of the upper-seam pillar. Figure 2 illustrates various types of accidents caused by ground instability in China coal mines over the years [6,15,16]. It can be observed that the yielding of powered supports is the first common type of accident, and face spalling is ranked second.…”

Section: Three Basic Types Of Crossing Overlying Remnant Pillarsmentioning

confidence: 99%

“…However, crossing overlying remnant pillars (CORP) increases the risk of ground control. The risk of ground control can include roof falls, rib spalling and floor heave, which can result in injury to miners, fatalities, interruptions in the mining operations, breakdowns in equipment, and so forth [4][5][6]. Therefore, a proper method for the assessment of ground control risk is of critical importance in order to enable engineers to correctly estimate the risk of CORP and properly plan out mining [7].…”

Section: Introductionmentioning

confidence: 99%

“…Figure 2 illustrates various types of accidents caused by ground instability in China coal mines over the years [ 6 , 15 , 16 ]. It can be observed that the yielding of powered supports is the first common type of accident, and face spalling is ranked second.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Assessment of ground instability risk of lower seam longwall panels during crossing overlying remnant pillars

Pan

Wang

et al. 2020

R. Soc. open sci.

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One of the most challenging safety problems is ground instability during crossing overlying remnant pillars (CORP). Ground instability not only causes injury to miners or fatalities, but also leads to interruptions in the mining operations and breakdowns in equipment. In this paper, 12 major parameters influencing the ground instability were firstly determined based on extensive international experience associated with CORP. The consequences of the ground instability were then assessed in terms of miners' health and financial losses. Afterwards, a practical method to assess the ground instability risk of lower-seam longwall panels during CORP was developed based on its probability and consequence. Finally, this method was successfully used to determine the best scheme for CORP of LW10-103 at Mugua coal mine. The main advantage of this method is that it enables mining engineers to easily use international experience for assessing the risk of ground instability and selecting reasonable supports during CORP.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Three Basic Types Of Crossing Overlying Remnant Pillarsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Assessment of ground instability risk of lower seam longwall panels during crossing overlying remnant pillars

Pan

Wang

et al. 2020

R. Soc. open sci.

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Research on the failure process and stability control technology in a deep roadway: Numerical simulation and field test

Zang

Chen

Zhang

et al. 2020

Energy Science & Engineering

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With the increase in mining depth and the deterioration of surrounding rock conditions, large deformation failure of deep roadway surrounding rock is still very common. To solve the support problem, it is necessary to understand the deformation and failure mechanism of the deep roadway. This paper presents a case study on the deformation failure behavior and support design of a deep roadway in the Tangyang mine by field tests and numerical simulations. The rock mass properties were first evaluated based on field data and the mechanical parameters of rock specimens. Then, the numerical model of the deep roadway surrounding rock was established based on the calibrated microparameters. The deformation features and cracking behavior of the roadway were investigated in detail. The results show that the cracking process of crack initiation, crack propagation, and rock separation in the surrounding rock of this kind of roadway is a gradual process developing from a shallow to deep depth. A combined support “bolt‐cable‐mesh‐steel ladder” was proposed based on the failure characteristics of the roadway. Finally, a numerical simulation and field experiment were conducted to evaluate the rationality of the proposed support scheme, and the results show that the new support method can effectively control the surrounding rock. This study can provide valuable references for support design in deep underground engineering.

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Study on the structural forms of the key strata in the overburden of a stope during periodic weighting and the reasonable working resistance of the support

Zhu

Yuan

et al. 2020

Energy Science & Engineering

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Many mines often passively select supports with a higher yield load to avoid the occurrence of support crushing and roof falling during periodic weighting. This method is not conducive to improving production efficiency or reducing mining costs, but it can ensure safe mining. An effective method for overcoming these problems is to determine the reasonable working resistance of the support according to the structural forms of the key strata in the overburden of the stope during periodic weighting. In this paper, comprehensive theoretical analysis, numerical simulation, and field observation were applied to study the discrimination of the key stratum structure (KSS) during periodic weighting and the calculation method of the support load. First, the KSS that affects the periodic weighting of the stope was classified. The “twice discrimination method” was proposed for determining the breaking form of the key strata and the articulated form of the broken blocks. On this basis, the spacing condition that determines whether adjacent key strata interact was analyzed. The discriminant conditions for synergistic breaking between the first subordinate key stratum (SKS1) and the upper key stratum were derived for the cases in which the SKS1 periodically breaks in the form of a cantilever beam, a voussoir beam, and a step beam. These conditions provide the basis for distinguishing the KSS in the overburden of the stope. In addition, mechanical models of the roof structure during periodic weighting were established, and general formulas for calculating the support loads of stopes with a single‐key‐stratum influence structure and a multikey‐stratum influence structure were presented. Finally, five fully mechanized coal faces with various mining conditions in China were considered for engineering verification. The results of this study demonstrate that the proposed method for determining the reasonable working resistance of the support is consistent with the field practice. The research results can provide a reference for roof control and support selection of stopes.

show abstract

Study on the disaster reduction mechanism of presplitting blasting and reasonable blasting parameters for shallowly buried remnant pillars

Cited by 14 publications

References 8 publications

Assessment of ground instability risk of lower seam longwall panels during crossing overlying remnant pillars

Assessment of ground instability risk of lower seam longwall panels during crossing overlying remnant pillars

Research on the failure process and stability control technology in a deep roadway: Numerical simulation and field test

Study on the structural forms of the key strata in the overburden of a stope during periodic weighting and the reasonable working resistance of the support

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