Failure Mechanism of Grouted Floor with Confined Aquifer Based on Mining-Induced Data

Mu, Wenqiang; Li, Lianchong; Zhang, Yongshu; Yu, Guofeng; Ren, Bo

doi:10.1007/s00603-022-03179-x

Cited by 15 publications

(4 citation statements)

References 52 publications

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“…Duan et al [72] studied the focal mechanism of mining-induced seismicities near an intrusive dyke via analysis of the E s /E p ratios (Figure 4), and the large-magnitude microseismic events characterized by high E s /E p ratios revealed the shear slip rock fracture process near the geological discontinuity in an Australia coal mine. Mu et al [73] employed E s /E p ratios to characterize the failure of a grouted floor and found that the grouting slurry significantly influences the failure mechanism of the grouted floor and the proportion of tensile fracture decreases with the tensile strength enhancement by grouted cement. Wojtecki et al [74] found that the focal mechanisms of 26 tremors induced by destress blasting in a Polish coal mine differ from that of tremors induced by coal mining, and the former exhibits a decreased E S /E P ratio.…”

Section: Microseismic Focal Mechanismmentioning

confidence: 99%

Applications of Microseismic Monitoring Technique in Coal Mines: A State-of-the-Art Review

Liu,

Wang,

Kou

et al. 2024

Applied Sciences

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China’s coal mines have to extend to greater depths for the exploitation of more mineral resources, and they have suffered catastrophic mining-induced disasters, such as rockbursts, water inrushes, coal and gas outbursts, and roof fall accidents. The microseismic monitoring technique is a practical tool for mine safety management, which is extensively utilized in many Chinese coal mines. Microcracks of coal/rock masses are recorded as microseismicities in the field, and the potential mining-induced instabilities can be assessed by in-depth analysis of the microseismic parameters. This study provides a state-of-the-art review of the achievements and developments of the microseismic monitoring technique in coal mines. It also presents some prospects for improving the location accuracy of microseismicity, efficient and intelligent processing of the microseismic data, comprehensive assessment of coal/rock instabilities, and development of new microseismic monitoring equipment. This study is valuable for mine safety management and may contribute to improving the deep mining production.

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Section: Microseismic Focal Mechanismmentioning

confidence: 99%

Applications of Microseismic Monitoring Technique in Coal Mines: A State-of-the-Art Review

Liu,

Wang,

Kou

et al. 2024

Applied Sciences

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“…studied temporal and spatial characteristics of rock fracture in the floor of deep mining face through the law of rock fracture microseismic(MS), the results show that the energy inoculation level of fracture expansion around the aquifer decreases after stable grouting reinforcement. Mu (2023) proposed an evaluation method of grouted floor based on mining-induced MS data and studied the fracturing zone and stress distribution under different grout radius.…”

Section: Introductionmentioning

confidence: 99%

The Two Zones of Floor Failure and its Control via a ‘Dual Key Layer’ Approach

Miao,

Xu,

Guo

et al. 2024

Mine Water Environ

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In Jiaozuo mining area of North China coal field, there are multiple strong water-richness aquifers close to the coal seam. In order to prevent floor water inrush accident, it is need to be reinforced by floor grouting before mining. According to the changes of the mechanics and hydrogeological properties of the floor key rock strata after floor grouting, the coal seam floor is divided into 'two zones' of 'water conduction fracture zone' and 'mechanical strength damage zone'. The composite water control model of 'floor structure stability water control key layer' and 'floor damage infiltration water control key layer' is established after grouting reinforcement of upper hard rock aquifer. Microseismic(MS) technology is used to analyse the characteristics of 'two zones' and the water control capability of 'dual key layers' in fault regions and no-fault regions respectively of experimental working face. It is revealed that the L8 limestone plays the role of mechanical barrier key layer after grouting. The change of elastic modulus of rock mass before and after grouting is measured by borehole ultrasonic method, which result shows that the elastic modulus of different rock mass increases by 40% to 852% respectively after grouting. By using the formula method, FLAC3D numerical simulation and field measurement, it is found that the failure depth of the floor after grouting is reduced by 51% compared with that without grouting. Seven influencing factors for floor water control 'dual key layer' are proposed, which are quantified by AHP (Analytic Hierarchy Process) method. A scheme of 'dual key layer' water control capability evaluation is formed by AHP method and influencing factors evaluation method. It is revealed that fault activation and fault with water-filling are the main factors that affect the failure of water control capability of 'dual key layer' and floor water inrush. The results of the research are consistent with the water inrush of the experimental working face, which will contribute to the early warning, prevention and evaluation of floor water inrush in mines with the same hydrogeological conditions.

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“…However, under the restrictions of technology and equipment available at the time, there are still mined-out areas with potential safety hazards that have not been properly solved [6]. In recent years, many scholars have proposed a variety of goaf ground pressure analysis methods, comprehensive disaster prevention, and early warning methods [7,8], which have achieved remarkable results in preventing goaf collapse and pillar instability [9] such as theoretical analysis [10], indoor acoustic emission test [11], numerical simulation [12], on-site microseismic monitoring [13,14], and on-site industrial test [15,16]. Marco et al [17] argued that the goaf near the working face was the leading factor in the occurrence of disasters, which seriously threatens the safety of mine production.…”

Section: Introductionmentioning

confidence: 99%

Distribution Law of Mine Ground Pressure via a Microseismic Sensor System

2023

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The particularity of the occurrence conditions of the ore body in Xianglushan Tungsten Mine determines the mining form of the ore body and the particularity of the ground pressure distribution after mining. A large number of mined-out areas, supporting pillars, and natural and human factors have formed a comprehensive disaster environment. This can lead to frequent disasters, great harm, serious economic losses, and the necessity of severe environmental protection operations in the mine. This study aims to establish a microseismic monitoring system according to the actual needs of the site and to reveal the law of ground pressure manifestation by analyzing the distribution characteristics of microseismic events; to analyze the occurrence stability of the goaf; further verify it laterally; and finally, demonstrate the feasibility and effectiveness of the microseismic monitoring sensor system. In view of the current ground pressure problem in Xiangxuoshan tungsten mine, the stress change characteristics during dynamic mining and filling were obtained through comparative analysis of different perspectives such as surface change, energy release, and mining loudness, and key areas were identified to improve the reliability of underground ground pressure monitoring. The results show that the process of deposit destabilization caused by ore body mining can be further analyzed by microseismic monitoring, and the combination of surface settlement, mining intensity, and energy release can verify the accuracy of stress distribution and ground pressure transfer. In turn, the general reliability of underground ground pressure hazard warning is empirically improved.

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Failure Mechanism of Grouted Floor with Confined Aquifer Based on Mining-Induced Data

Cited by 15 publications

References 52 publications

Applications of Microseismic Monitoring Technique in Coal Mines: A State-of-the-Art Review

Applications of Microseismic Monitoring Technique in Coal Mines: A State-of-the-Art Review

The Two Zones of Floor Failure and its Control via a ‘Dual Key Layer’ Approach

Distribution Law of Mine Ground Pressure via a Microseismic Sensor System

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