Performance change of shaft lining concrete under simulated coastal ultra-deep mine environments

Zhou, Yuxuan; Liu, Juanhong; Huang, S.; Yang, Haitao; Ji, Hong

doi:10.1016/j.conbuildmat.2019.116909

Cited by 12 publications

(4 citation statements)

References 42 publications

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“…Currently, due to the many technological, economic, and environmental obstacles of deep-sea mining, full-scale mining activities are carried out mainly in coastal areas [4,5]. However, coastal deep mining also faces many challenges, such as high stresses, high pore-water pressure, unusual temperatures, and the environmental impacts of artificial disturbances [6][7][8]. In addition, seawater intrusion and the geological complexity of seabed rock formations complicate extraction efforts, affecting the safety of mining operations and increasing the risk of mining equipment damage [9,10].…”

Section: Introductionmentioning

confidence: 99%

Effect of Chemical Corrosion on Rock Fracture Behavior in Coastal Deep Mines: Insights from Mechanical and Acoustic Characteristics

Pan,

Ma,

Zhang

et al. 2024

JMSE

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The demand for critical minerals has increased extraction activities in coastal deep mines where challenges such as high stresses, chemical corrosion, and mining disturbance impacts are present. This study investigated the effects of chemical corrosion and confining pressure on the mechanical and fracture behaviors of granite specimens, which are crucial for ensuring the stability of surrounding rock in coastal deep mines. Triaxial compression tests were conducted on uncorroded specimens and corroded specimens immersed in acid and alkali solutions under varying confining pressures, with real-time acoustic emission (AE) monitoring. Based on the test results, the strength and deformation properties, progressive fracture, and failure processes, as well as the AE response characteristics of the specimens under chemical corrosion and confining pressure were analyzed. Additionally, the influence of confining pressure on the chemical damage and brittle–ductile transition behavior of specimens was discussed, and the mechanism of chemical corrosion on the physical and mechanical behavior of specimens was revealed based on mineralogical analysis. These findings underscore the importance of understanding the interplay between chemical corrosion, confining pressure, and rock fracture behavior in coastal deep mining and contribute to evaluating the stability of underground surrounding rocks under corrosion environments.

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Section: Introductionmentioning

confidence: 99%

Effect of Chemical Corrosion on Rock Fracture Behavior in Coastal Deep Mines: Insights from Mechanical and Acoustic Characteristics

Pan,

Ma,

Zhang

et al. 2024

JMSE

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“…Some high-grade shaft lining concrete may even suffer brittle failure in the deep external environment of high in situ stress and high osmotic pressure. Simultaneously, the deep strata and deep-water quality in the coastal area are rich in Cl − and SO 2− 4 ions, putting the shaft lining concrete at risk of chemical corrosion [7][8][9], which seriously affects the strength and durability of the concrete [10][11][12][13] and dramatically shortens the life of the shaft lining.…”

Section: Introductionmentioning

confidence: 99%

Monitoring and Analysis of a High-Performance Concrete Shaft Lining: A Case Study

Quan

et al. 2022

Advances in Materials Science and Engineering

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Shaft lining in ultradeep mines on the coast of eastern China under the complex external environments of “high in situ stress and high osmotic pressure” has the disadvantages of failure; to solve this problem, the field test of high-performance concrete shaft lining structure was carried out in Sha-ling gold mine. The field test study of the high-performance concrete shaft lining was carried out in a −1120 m ingate and a −1114 m to −1124 m shaft. Its stress and deformation were monitored and analyzed. The maximum compressive stress of the HPC shaft lining structure at the level of −1117.7 m of the air intake shaft is 1.91 MPa. Based on the Von-Mises yield theory and the analytical solution of thick-walled cylinder theory, the ultimate limit of the high-performance concrete shaft lining in the Sha-ling gold mine was obtained. The high-performance concrete shaft lining strain changes smoothly, and concrete strain can be divided into three stages: the rapid growth period, the slow growth period, and the stable period. The monitoring results show that the high-performance concrete shaft lining has excellent mechanical properties in the external environment of high in situ stress, which can be used as a reference for the support design of similar projects.

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“…The sinking cycle consists of drilling, blasting, mucking, hoisting, establishing support, and shaft lining, including some auxiliary operations. The advance of the concrete lining of a shaft sunk in a hard rock mine is normally close to the bottom of the excavation (see Figure 1) [8,9]. The high stress and 'anisotropy' (including rock mass, structure, stress, etc.)…”

Section: Introductionmentioning

confidence: 99%

A Primary Support Design for Deep Shaft Construction Based on the Mechanism of Advanced Sequential Geopressure Release

et al. 2022

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The construction of 1500 m depth shaft in Xincheng Gold Mine, China, faces complex stress conditions such as high geostress (>50 MPa), high ground temperature (>50 °C), high water-pressure (>9 MPa), and highly corrosive. Traditional deep shafts excavated by the sinking and lining method cannot adapt to high geostress problems, such as rock bursts and large deformations, etc., in the deep shaft construction process. To avoid and adjust the high geostress induced the rockburst and large deformations, the mechanism of the advanced sequential geopressure release (ASGR) has been proposed for the ground control in deep shaft construction. In this paper, the safe distance between the concrete lining and the shaft excavation face is determined based on the ASGR mechanism, which can provide the space for geopressure release, and primary support based on rock mass quality and numerical simulation was employed to control the geopressure and deformation. A new support scheme for the deep shaft is proposed, using long bolts to restrain severe deformations, metal mesh, and a double reinforcement bar to improve the induced stress distribution. According to the results, the construction scheme of deep shaft has been improved, and the safe support distance of the proposed scheme is determined to be 12 m, with an interval of three excavation cycles. Compared to the original scheme of shaft lining after excavation, the proposed scheme based on the ASGR mechanism can effectively improve the geopressure release and benefit from controlling the rockburst and large deformation of deep shaft induced by high geostress conditions. The stress distribution in the lining is more uniform, and safety factor of the lining is increased to 2.0, which is benefit the long-term stability of deep shaft.

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Performance change of shaft lining concrete under simulated coastal ultra-deep mine environments

Cited by 12 publications

References 42 publications

Effect of Chemical Corrosion on Rock Fracture Behavior in Coastal Deep Mines: Insights from Mechanical and Acoustic Characteristics

Effect of Chemical Corrosion on Rock Fracture Behavior in Coastal Deep Mines: Insights from Mechanical and Acoustic Characteristics

Monitoring and Analysis of a High-Performance Concrete Shaft Lining: A Case Study

A Primary Support Design for Deep Shaft Construction Based on the Mechanism of Advanced Sequential Geopressure Release

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