Lagging Collapse Mechanism of Gypsum-Mined Gob with Rock Creep

Wang, Shuli; Lv, Weikui; Zhi-he, Liu; Huai-chang, Zheng

doi:10.1007/s10706-021-02040-2

Cited by 3 publications

(2 citation statements)

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“…In addition, most gypsum mines have been excavated using the room-and-pillar method. Insufficient early management and indiscriminate mining have resulted in large and irregular gypsum mine goafs, and in turn have caused large-scale ground collapse [ 3 , 4 , 5 ]. For example, in November 2005, the Xingtai gypsum mine in China suffered a massive crown collapse, resulting in many casualties, 37 deaths and 38 injuries [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Micro-Seismic Events Induced by Ground Collapse—A Case Study in the Rongxing Gypsum Mine in Hubei Province, China

Wang,

Chen,

2024

Sensors

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Mining activities can damage rock masses and easily induce ground collapse, which seriously threatens safe production in mining areas. Micro-seismic systems can monitor rock mass deformation signals in real time and provide more accurate data for rock mass deformation analysis. Therefore, in this study, the waveform characteristics of micro-seismic events induced by ground collapse in the Rongxing gypsum mine were analyzed; the occurrence of these events was introduced on the basis of Fast Fourier Transform, an established Frequency–Time–Amplitude model, in order to put forward the index of energy proportion of the main band. The results showed the following. (1) The seismic sequence type of ground collapse was foreshock–mainshock–aftershocks. The interval between the foreshock and mainshock was longer than that between the mainshock and aftershocks. (2) The deformation corresponding to the foreshock micro-seismic events was mainly that of a small-scale crack. The deformation corresponding to the micro-seismic events during the mainshock was characterized by the gradual development of small-scale cracks, and the development of large-scale cracks accelerated, accompanied by slight rock collapse. The deformation corresponding to the micro-seismic events during the aftershocks showed that almost no small-scale cracks developed, and the large-scale crack development was intense, and accompanied by numerous rock and soil mass collapses. (3) The observed decreasing frequency distribution and energy dispersion can be used as possible precursors of ground collapse.

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Section: Introductionmentioning

confidence: 99%

Characteristics of Micro-Seismic Events Induced by Ground Collapse—A Case Study in the Rongxing Gypsum Mine in Hubei Province, China

Wang,

Chen,

2024

Sensors

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“…Creep is the typical mechanical property of gypsum rock. Liu et al researched the creep characteristics of gypsum rock and its stability through uniaxial compression experiments and the step loading test [13][14][15]. A large number of other scholars have also carried out research work on the collapse hazard of gypsum mined gob based on different methods and perspectives [16,17].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Strength Weakening of Gypsum Rock with Effect of Long-Term Overlying Strata Pressure

et al. 2022

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A long time lag is the main characteristic of gypsum mined gob collapse disasters. With the coring of a gypsum rock specimen from the supporting pillars in gob, which formed over several years, the strength weakening effect of the gypsum rock with long-term overlying strata pressure is revealed by experimentation. The results show that: uniaxial compression stress–strain curves represent major differences in different lateral depths of the same supporting pillar. With the increase in lateral depth, peak strength increases and the corresponding strain decreases, which becomes more obvious as the age increases. As a function of time, peak strength decreases and the corresponding strain increases in the shallow part of the pillar as the age increases. Peak strength fluctuates in the middle part and increases in the deep part; the corresponding strain fluctuates in the middle and deep parts, but demonstrates the opposite changing law. Finally, the reason for the above law was comprehensively and thoroughly researched and demonstrated. The maximum strength weakening rate of gypsum rock in the shallow part of a supporting pillar of 0.5 m depth was 21.06% in the year 1996. The slow strength weakening effect of gypsum rock with long-term overlying strata pressure is the essential reason why gypsum mined gob collapses occur in subsequent years or even decades.

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The concept of risk-based technical solutions for the protection of ore and non-ore mine workings

Skipochka,

Krukovskyi,

Serhiienko

2023

Geoteh. meh.

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The subject of the research presented in the article is the fastening and protection of mine workings for the extraction of ore and non-ore minerals for the construction industry. The purpose of the work is the development of the concept of risk-oriented technical and technological solutions for the protection of underground mine workings to dramatically increase the efficiency and safety of extraction of ore and non-ore minerals at deposits of a complex structure. The work uses the well-known mixed method of risk assessment, which assumes that underground mining production is accompanied by three main interrelated indicators: occupational safety of miners, environmental safety, and financial and economic risks. The method involves building a matrix of consequences and probabilities by ranking them. The technical-technological solutions for fastening and protection of workings of iron ore and uranium mines and underground enterprises for the extraction of non-metallic raw materials are analyzed. Their shortcomings are identified and the associated risks of operation and long-term preservation of underground enterprises are assessed. The concept of technical and technological solutions for improving the safety, environmental and economic performance of mines is proposed, which should be the basis of the new regulatory and technical documentation for the protection of workings. In particular, for ore mines, this concerns the transition to new technologies of anchorage, special conditions for lining junctions, introduction of bookmarks in particularly dangerous areas, control and reduction of water inflows. For mines producing non-metallic raw materials, the effectiveness of a complete transition from drilling and blasting technology to a mining machinermed one has been practically. If there are thick seams, it is recommended to work them out in separate layers, leaving a gap between them. It is advisable to divide the zones of geological disturbances into small areas, which are outlined with barrier pillars. Emphasis is placed on the mandatory implementation of comprehensive monitoring of the condition of the roof of the structures and their lining on the active and decommissioned areas. Depending on the degree of risk of collapse in large-scale mine workings and its impact on ground objects, the feasibility of using stowing is determined. Research results can be used to implement measures to improve miners' labor safety, environmental safety, and economic performance of ore and non-ore mines.

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Lagging Collapse Mechanism of Gypsum-Mined Gob with Rock Creep

Cited by 3 publications

References 1 publication

Characteristics of Micro-Seismic Events Induced by Ground Collapse—A Case Study in the Rongxing Gypsum Mine in Hubei Province, China

Characteristics of Micro-Seismic Events Induced by Ground Collapse—A Case Study in the Rongxing Gypsum Mine in Hubei Province, China

Experimental Study on Strength Weakening of Gypsum Rock with Effect of Long-Term Overlying Strata Pressure

The concept of risk-based technical solutions for the protection of ore and non-ore mine workings

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