Measures for controlling large deformations of underground caverns under high in-situ stress condition – A case study of Jinping I hydropower station

Song, Shengwu; Feng, Xia‐Ting; Chenggang, Liao; Dewen, Cai; Liu, Zhongxu; Yang, Yanyan

doi:10.1016/j.jrmge.2016.06.002

Cited by 34 publications

(4 citation statements)

References 9 publications

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“…The effectiveness of the support systems and rock mass stability is verified by monitoring the support elements using loadcells and deformations using the MPBX and identifying the crucial zones of the powerhouse and transformer caverns [15,27]. The sophistication and remoteness of instruments increase with a decrease in the stability of the structure [28].…”

Section: Instrumentation and Monitoringmentioning

confidence: 99%

Study on the Impact of Different Parameters on Prediction of Crown Deformations in Underground Caverns

Sudhakar,

Sinha,

Naik

2023

Sustainability

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Crown deformation is a major concern in the design and construction of underground caverns. It can lead to damage to the cavern structure and surrounding infrastructure and can also pose a safety hazard to workers. This paper studies the factors affecting crown deformation in underground caverns. A parametric study was conducted to investigate the effects of seven parameters on crown deformation: rock mass rating (RMR), uniaxial compressive strength (UCS), Young’s modulus of intact rock (Ei), Poisson’s ratio (υ), tensile strength (σt), angle of internal friction (φ), and cohesion (C). The results of the parametric study showed that the following parameters significantly affected crown deformation: RMR, UCS, Ei, and Φ. A multiple linear regression analysis was conducted to develop a regression equation to predict crown deformation. The coefficient of determination (R2) for the regression equation is 92.92%, which indicates that the equation is a good predictor of crown deformation. The parametric study results and the regression analysis can be used to improve the design and construction of underground caverns. By considering the factors that affect crown deformation, engineers can design more stable caverns that are less likely to experience deformations. The results of the study can be used to improve the design and construction of caverns, making them safer and more sustainable.

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Section: Instrumentation and Monitoringmentioning

confidence: 99%

Study on the Impact of Different Parameters on Prediction of Crown Deformations in Underground Caverns

Sudhakar,

Sinha,

Naik

2023

Sustainability

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“…It was known that the magnitude and direction of in situ stress have a great relationship with the stability of the surrounding rock. So, it Advances in Civil Engineering can be understood that the precondition for the stability analysis of surrounding rock depends on the measurement of in situ stress, which can guide the realization of scientific and reasonable tunnel design [21,22]. e hollow inclusion gauge stress relief method was adopted in the field to carry out the in situ stress test at the level of 90 m main access which is 600 m below the surface, while the DCDA method was adopted to carry out sampling test in laboratory for the other elevation cores.…”

Section: In Situ Stressmentioning

confidence: 99%

Deformation Mechanism and Support Technology of Deep and High‐Stress Soft Rock Roadway

Zheng

Zuo

et al. 2021

Advances in Civil Engineering

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In this study, the analysis and control of stability of surrounding rock in deep fractured soft rock roadway located in the underground mine of Jinfeng gold mine in Guizhou Province, China, has been investigated. The surrounding rock of roadway has been analyzed to characterize its deformation and failure mechanism through field survey, testing of rock physical and mechanical properties, in situ stress measure, analysis of mineral components of rock, and investigation of rock fragmentation degree. Based on the numerical simulation technology, the influence of different factors on the stability of roadway is studied. The physical and mechanical properties of surrounding rock and the bearing capacity of surrounding rock layer are to be improved to maintain the stability of broken soft rock roadway as high ground stress, rock fragmentation, and poor lithology leading to tunnel instability. Hence, a high-strength “cable bolt + fiber-reinforced shotcrete + steel mesh + split sets + resin bolt + cement grouting” combined support system has been proposed to improve the effective bearing structure significantly with high integrity and bearing capacity.

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“…With the internal stress of the pillar increasing, the edge of the pillar begins collapsing. When the collapse reaches a certain degree, catastrophic instability of the pillar occurs [14][15][16][17][18][19].…”

Section: The Criterion For Pillar Instability Based On Cusp Catastropmentioning

confidence: 99%

Research on Catastrophic Pillar Instability in Room and Pillar Gypsum Mining

Zhou

et al. 2018

Sustainability

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Gypsum mines in China are mostly exploited through room and pillar mining. Due to backward mining technology and a long history of mining, a great number of pillars were left in gypsum mines. Many serious work safety accidents occurred as the result of goaf instability in history, which posed severe threats to the security of people’s lives and property. Based on the characteristics of surrounding rock damage, this research improved the constitutive equation of gypsum rock mass damage by establishing a damage evolution model and introducing a shape parameter. Meanwhile, the cusp catastrophe equation was deduced based on the catastrophe theory and the constitutive equation of gypsum rock mass damage, thus summarizing the criteria for pillar instability; the pillar safety factor was obtained by means of the interrelation between pillar load and pillar strength. Based on the criteria for pillar instability and the pillar safety factor obtained, the necessary and sufficient conditions for pillar stability were concluded. These conclusions are of significance in that they provide theoretic reference for the treatment of gypsum goaf, as well as for further mining.

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Measures for controlling large deformations of underground caverns under high in-situ stress condition – A case study of Jinping I hydropower station

Cited by 34 publications

References 9 publications

Study on the Impact of Different Parameters on Prediction of Crown Deformations in Underground Caverns

Study on the Impact of Different Parameters on Prediction of Crown Deformations in Underground Caverns

Deformation Mechanism and Support Technology of Deep and High‐Stress Soft Rock Roadway

Research on Catastrophic Pillar Instability in Room and Pillar Gypsum Mining

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