Impact of Construction Method and Ground Composition on Headrace Tunnel Stability in the Neelum–Jhelum Hydroelectric Project: A Case Study Review from Pakistan

Rehman, Hamood Ur; Naji, Abdul Muntaqim; Nam, Kyoungwoo; Ahmad, Sohail; Muhammad, Khan; Yoo, Hee Koo

doi:10.3390/app11041655

Cited by 20 publications

(8 citation statements)

References 58 publications

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“…Microseismic monitoring (MSM) represents an important real-time, online, and remote monitoring method that is widely used in many fields, including underground tunnel construction, deep mining, water conservancy, and hydropower projects [1][2][3][4][5][6][7][8][9]. Particularly in the case of underground mine excavation and mining construction processes, the scientific framework and practical layout of MSM station networks are the basis for data acquisition and the promotion of field data interpretation and application [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

An Optimization Method for the Station Layout of a Microseismic Monitoring System in Underground Mine Engineering

Zhou

Zhao

Huang

2022

Sensors

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The layout of microseismic monitoring (MSM) station networks is very important to ensure the effectiveness of source location inversion; however, it is difficult to meet the complexity and mobility requirements of the technology in this new era. This paper proposes a network optimization method based on the geometric parameters of the proposed sensor-point database. First, according to the monitoring requirements and mine-working conditions, the overall proposed point database and model are built. Second, through the developed model, the proposed coverage area, envelope volume, effective coverage radius, and minimum energy level induction value are comprehensively calculated, and the evaluation reference index is constructed. Third, the effective maximum envelope volume is determined by taking the analyzed limit of monitoring induction energy level as the limit. Finally, the optimal design method is identified and applied to provide a sensor station layout network with the maximum energy efficiency. The method, defined as the S-V-E-R-V model, is verified by a comparison with the existing layout scheme and numerical simulation. The results show that the optimization method has strong practicability and efficiency, compared with the mine’s layout following the current method. Simulation experiments show that the optimization effect of this method meets the mine’s engineering requirements for the variability, intelligence, and high efficiency of the microseismic monitoring station network layout, and satisfies the needs of event identification and location dependent on the station network.

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Section: Introductionmentioning

confidence: 99%

An Optimization Method for the Station Layout of a Microseismic Monitoring System in Underground Mine Engineering

Zhou

Zhao

Huang

2022

Sensors

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“…The physical and mechanical properties of rock mass are different, caused by the complexity and variability of the geological environment (Parise et al, 2015;Rehman et al, 2021). There are a large number of landslides and dangerous rock masses in the Three Gorges Reservoir area, posing a severe threat to the property and life of the surrounding people (Yin et al, 2015(Yin et al, , 2017Zhou et al, 2022a).…”

Section: Introductionmentioning

confidence: 99%

Study on the deterioration trend of the rock mass on the reservoir banks under dry-wet cycles

Gao

Xiang²,

Xiang³

et al. 2022

Front. Ecol. Evol.

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The deterioration of rock mass under dynamic mechanical state is difficult to determine, especially when evolution trends of micro-fractures are considered. Taking the limestone from Wuxia section of the Three Gorges Reservoir area as studying case, cross-scale tests and theoretical analysis were adopted to study the influence of dry-wet cycles on rock deterioration. The weakly acidic condition (pH = 6) and the dry environment at 105°C were together constituted the two extreme mechanical states of the dry-wet cycles. Meanwhile, the number of dry-wet cycles and soaking time were used as the main variables to analyze the deterioration trend. After introducing the damage mechanics, the quantitative relationship between the mechanical parameters and changing mechanical states was obtained. Combined with the microstructure obtained by scanning electron microscope (SEM), it can be found that with the increase of dry-wet cycles and soaking time, the morphology of mineral particles changed, the number of secondary pores gradually increased, the surface structure became looser, and the microcracks gradually increased, causing the decrease of macro strength. The related method proposed in this paper could provide significant references to determine the mechanical parameters of rocky reservoir bank.

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“…When a large amount of energy is stored in abandoned mines, it has a great impact on the safety of underground coal mines, resulting in the occurrence of rock burst accidents (Jiang et al, 2016;Fan et al, 2020;Liu et al, 2020a;Kang et al, 2021). Rock bursts, which can occur in mining are well known in the industry and can threaten mine safety (Ma et al, 2015;Barton and Shen, 2017;Keneti and Sainbury, 2018;Rehman et al, 2021;Xiong et al, 2021). A rockburst is typically influenced by geological conditions and the mining technology used (Jiang et al, 2014;Qi et al, 2020;Qi et al, 2019;Liu et al, 2020b;Zhang et al, 2021a).…”

Section: Introductionmentioning

confidence: 99%

An Investigation Into the Mechanism of Rock Bursts in Mines for Tunnel-Cut Isolated Areas with Multiple Stress Fields

Zhang

Ouyang

et al. 2022

Front. Earth Sci.

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Tunnels in several mines in Shaanxi Province, China, which are subject to multiple stress fields, are used as case studies to clarify the structural problems associated with rock bursts that occur in high-stress mines. Field studies featuring field measurements and theoretical analysis are used to investigate the modes and mechanisms of failure. The following are the main findings: (1) a model for distributing the dominant pressure features around the goaf was established by analyzing the stress distribution induced by the goafs on both sides of the excavated zone in a coal seam. The model reveals the pressure distribution in the tunnel-cut area, which is the mechanical factor responsible for rockburst. (2) Because of the goafs acting on both sides of the tunnel, an area of concentrated stress was formed, and stress was transferred to the coal seam. The intense tunnel-cutting action can reduce the stability of the coal. The plastic area caused by tunnel mining and a reduction in the elastic area of the tunnel-cut coal pillars in each segment, increase the possibility for rockburst under the application of dynamic-static stress; this process is known as a stabilizing factor. (3) Due to the combined effect of the tunnel-cut and goafs on both sides, most of the microseismic incidents happened in the core area of coal pillar and in the side of tunnels. When the stress applied on coal pillar is more than critical strength, burst and mine earthquake can be induced. Our study focused mainly on rockburst incidents that occurred in coal mines in Shaanxi Province, which were caused by tunnel-cut coal seams that were subject to multiple stress fields. The study has direct implications for developing new and improved guidelines for preventing rockburst in mines.

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Impact of Construction Method and Ground Composition on Headrace Tunnel Stability in the Neelum–Jhelum Hydroelectric Project: A Case Study Review from Pakistan

Cited by 20 publications

References 58 publications

An Optimization Method for the Station Layout of a Microseismic Monitoring System in Underground Mine Engineering

An Optimization Method for the Station Layout of a Microseismic Monitoring System in Underground Mine Engineering

Study on the deterioration trend of the rock mass on the reservoir banks under dry-wet cycles

An Investigation Into the Mechanism of Rock Bursts in Mines for Tunnel-Cut Isolated Areas with Multiple Stress Fields

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