Failure mechanism and control technology of water-immersed roadway in high-stress and soft rock in a deep mine

Yang, Renshu; Li, Yongliang; Guo, Dongming; Yao, Lan; Yang, Ting; Li, Taotao

doi:10.1016/j.ijmst.2017.01.010

Cited by 76 publications

(29 citation statements)

References 2 publications

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“…The excessive groundwater inflow and seepage not only threatens tunneling safety during excavation but also continues to deteriorate the strength and deformation characteristics of the rock mass over time, and decreases the stability of deep underground openings in argillaceous rock [34]. The influence of groundwater on the argillaceous rock contains two main aspects: the mechanical action of water on the surrounding rock, including the hydrostatic pressure of the effective force and the dynamic water scouring effect, and the physical and chemical action of water on the rock mass, including softening, argillization, dissolution, and swelling [35,36].…”

Section: Groundwater Inrush and Coal And Gas Outburstmentioning

confidence: 99%

Stability of Deep Underground Openings through Large Fault Zones in Argillaceous Rock

et al. 2017

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Abstract:The stability of underground openings is pivotal to sustainable safe mining in underground coal mines. To determine the stability and tunneling safety issues in 800-m-deep underground openings through large fault zones in argillaceous rocks in the Guqiao Coal Mine in East China, the pilot industrial test, laboratory experimentation, and field measurements were used to analyze the large deformations and failure characteristics of the surrounding rock, the influence factors of safe excavation and stability of underground openings, and to study the stability control countermeasures. The main factors influencing the stability and tunneling safety include large fault zones, high in situ stress, poor mechanical properties and engineering performance of the argillaceous rock mass, groundwater inrush and gas outburst. According to the field study, the anchor-ability of cables and the groutability of cement-matrix materials in the argillaceous rock in the large fault zones were extremely poor, and deformations and failure of the surrounding rock were characterized by dramatic initial deformation, high long-term creep rate, obviously asymmetric deformations and failure, rebound of roof displacements, overall loosened deformations of deep surrounding rock on a large scale, and high sensitivity to engineering disturbance and water immersion. Various geo-hazards occurred during the pilot excavation, including roof collapse, groundwater inrush, and debris flow. Control techniques are proposed and should be adopted to ensure tunneling safety and to control the stability of deep underground openings through large fault zones, including regional strata reinforcement technique such as ground surface pre-grouting, primary enhanced control measures, floor grouting reinforcement technique, and secondary enclosed support measures for long-term stability, which are critical for ensuring the sustainable development of the coal mine.

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Section: Groundwater Inrush and Coal And Gas Outburstmentioning

confidence: 99%

Stability of Deep Underground Openings through Large Fault Zones in Argillaceous Rock

et al. 2017

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“…The high geothermal environment in deep mines is one of the constraints in mining and is as important as high ground pressure and high seepage pressure Yang et al, 2017;Zhang et al, 2018;Lin et al, 2019a). At present, more than 150 1000 m-plus deep mines exist in the world (Xie, 2017).…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Heat Transfer and Phase Change Characteristics of Cold Load and Storage Functional CPB in Deep Mine

Wang

Lyu

et al. 2020

Front. Earth Sci.

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As high mine-cooling costs have become a restriction for deep mining, a new cooling method has been proposed. In the area of filling mining, the CPB (cemented paste backfill) was given the cooling function by mixing it with phase change material (PCM). In deep mines, the PCM (e.g., ice particles) absorb heat and change phases to cool the surrounding environment. A deep-mine-cooling mode based on the new CPB and upward sublevel filling method was designed, and the characteristics of the phase change were analyzed by numerical simulation. From the simulation results of the cooling period, this cooling method was effective during the whole stopes mining period. The CLS (cold load and storage) CPB mass concentration and the PCM initial proportion are the important factors controlling the cooling effect. It is concluded that the phase change duration decreased with the increasing mass concentration, while it increased with the increasing initial proportion of ice to water. Note that the thickness of CLSfunctional CPB should be as small as possible to ensure the cold release rate. This study provides a theoretical foundation of heat transfer for the design and implementation of deep mine cooling by applying CLS-functional CPB. Keywords: mine cooling, cold load and storage, mass concentration, proportion of ice to water, heat transfer HIGHLIGHTS -The phase change of CLS functional CPB in deep mines was investigated numerically. -The heat conduction model compound with hydration-porous-enthalpy model was applied. -The phase change and heat transfer law of CLS functional CPB was investigated. -The main influencing factors were analyzed and suggestions for engineering were presented.

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“…Wang et al [29] proposed a concept of "high-strength, integrity, and pressure-relief" and developed a confined concrete support system. Yang et al [30] proposed a support technology focusing on cutting off the water, strengthening the small structure of the rock, and transferring the massive structure of the rock. Fang et al [31] designed a bolt-shotcrete support program and monitored the mechanical property of the shotcrete layer.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation Analysis of New Steel Sets Used for Roadway Support in Coal Mines

Zhang

Wang

et al. 2019

Metals

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The surrounding rock control is a tough issue in the roadway with the swelling soft rock. The steel set is an important material for the control of swelling soft rock roadways. However, traditional steel sets failed to prevent the expansive pressure of the soft rock. Based on traditional steel sets, this paper developed a new steel set through both theoretical analysis and numerical simulation. The results showed that the new steel set was the set with the roof beam 1000 mm from the top of the set and the floor beam 400 mm from the bottom end of the set. The maximum deformations of the roof-floor and two sides of the ventilation roadway controlled by the best-improved set at the observation point were 147 mm and 108 mm, respectively. So, the best-improved set can effectively control the surrounding rock of the ventilation roadway. This provides an effective method for the surrounding rock control in extremely soft rock roadways.

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Failure mechanism and control technology of water-immersed roadway in high-stress and soft rock in a deep mine

Cited by 76 publications

References 2 publications

Stability of Deep Underground Openings through Large Fault Zones in Argillaceous Rock

Stability of Deep Underground Openings through Large Fault Zones in Argillaceous Rock

Numerical Investigation of Heat Transfer and Phase Change Characteristics of Cold Load and Storage Functional CPB in Deep Mine

Numerical Simulation Analysis of New Steel Sets Used for Roadway Support in Coal Mines

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