Engineering geological and geotechnical investigations along the head race tunnel in Teesta Stage-III hydroelectric project, India

Panda, Malaya K.; Mohanty, S.; Pingua, B.M.P; Mishra, A. K.

doi:10.1016/j.enggeo.2014.08.022

Cited by 25 publications

(10 citation statements)

References 25 publications

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“…The three-dimensional wedges are formed by the intersections of three or more joint planes on the excavation boundary of the opening [76,77]. There are three discontinuity sets in the 1-1# stope roof.…”

Section: Unwedge Simulationmentioning

confidence: 99%

Stability Analyses and Cable Bolt Support Design for A Deep Large-Span Stope at the Hongtoushan Mine, China

Zhao

Zhang

et al. 2019

Sustainability

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This study presents stability analyses and a cable bolt support design for a typical deep large-span stope (1-1# stope) at the Hongtoushan mine in China, using an integrated empirical and numerical method. Detailed field work including quantification of joint distribution and surface quality, along with laboratory test on intact rock samples, were performed to obtain the geotechnical properties of rock masses. The rock mass of the 1-1# stope was characterized by rock mass rating (RMR), rock mass quality (Q), and geological strength index (GSI), and then the modulus, peak strength, cohesive strength, and internal friction angle of the rock mass were estimated. The stability of the stope was then evaluated by empirical (RMR, stability graph) and numerical approaches (limit equilibrium analyses with UNWEDGE and stress-strain analyses with FLAC3D), considering of the effects of rock mass quality, induced stress, and large-span. A cable bolt support system obtained from the empirical method, was then further analyzed using the FLAC3D and UNWEDGE codes. The results show that the maximum plastic zone thickness and vertical displacement at the stope roof decrease significantly and the safety factor of the unstable wedge block increases significantly after installing the cable bolt support systems recommended by the empirical method. Therefore, it is suggested that an integrated empirical and numerical method is used to obtain quantitative stability assessment and optimum cable bolt support design for deep large-span stope roofs.

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Section: Unwedge Simulationmentioning

confidence: 99%

Stability Analyses and Cable Bolt Support Design for A Deep Large-Span Stope at the Hongtoushan Mine, China

Zhao

Zhang

et al. 2019

Sustainability

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“…Different Support Categories (type of support) for different rock mass classes are defined by these values. Similarly, the classification systems have become a tool for evaluating the geotechnical parameters of different rock masses from various empirical equations (Ozsan et al, 2009;Ghiasi et al, 2011;Panda et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Rock mass characterization and support analysis of pressurized headrace tunnel of the Upper Balephi “A” Hydroelectric Project, Nepal

Chaulagai

Dahal

2022

Journal of Nepal Geological Society

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Detailed geological, engineering geological and geotechnical assessment are prerequisites for any design works in underground excavation. Due to complex geology in young Himalayan, it is mandatory. Any misjudgment in support design may results huge losses of cost and time of the project. This paper encompasses detailed analysis carried out for examining the rock mass properties for optimum support along a pressurized headrace tunnel of Upper Balephi “A” Hydroelectric Project, Nepal. Empirical, analytical and numerical methods were applied for safe tunnel design. The rock mass quality and support in these areas were estimated using the rock mass rating (RMR), geological strength index (GSI) and rock mass quality (Q) systems. The detailed rock engineering assessment indicated that there are some critical locations along the headrace tunnel alignment. Rock mass quality values derived from different methods were used for calculating modulus of deformation, Hoek-Brown constants, strength of rock mass, in situ stresses, squeezing and support pressure using available empirical equations. The support determined from the empirical methods were evaluated for the overall stability of the required excavation by using finite element method. The analysis showed that the support pressure and deformation can be predicted very well and magnitude of the displacements and extent of the plastic zones can be reduced significantly by application of the support installation. The numerical modelling reveals that the support suggested by empirical methods are appropriate. Both empirical and numerical approaches are necessary for the confirmation of reliable support design of underground structure.

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“…With the advancement of underground engineering technology, more and more tunnels have been built in deep complex rock strata [1][2][3]. In the process of deep tunneling, alternating soft and hard composite rock strata are often encountered.…”

Section: Introductionmentioning

confidence: 99%

Particle Flow Analysis of Mechanical Properties and Failure Behaviour in Composite Rock Strata with Holes

et al. 2021

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Understanding the deformation failure behavior of the composite rock strata has important implications for deep underground engineering construction. Based on the uniaxial compression laboratory test of the specimens of composite rock strata containing holes, the microscopic parameters in the particle discrete element simulation are firstly calibrated. Then, the mechanical properties and failure characteristics of the composite rock strata with holes under different confining pressures are studied. The results show that different dip angles and confining pressures have significant effects on the peak strength and elastic modulus of the specimens. Under the same confining pressure, the peak strength and elastic modulus decrease first and then increase with the increasing dip angle. As the dip angle is constant, both the peak strength and elastic modulus gradually increase with the increase in confining pressure. It shows that the first area to be damaged in composite rock strata transfers from soft rock to hard rock with the increase in dip angle. With the increase in confining pressure, the range of tensile stress concentration area decreases substantially, while the range of compressive stress concentration area changes less.

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Engineering geological and geotechnical investigations along the head race tunnel in Teesta Stage-III hydroelectric project, India

Cited by 25 publications

References 25 publications

Stability Analyses and Cable Bolt Support Design for A Deep Large-Span Stope at the Hongtoushan Mine, China

Stability Analyses and Cable Bolt Support Design for A Deep Large-Span Stope at the Hongtoushan Mine, China

Rock mass characterization and support analysis of pressurized headrace tunnel of the Upper Balephi “A” Hydroelectric Project, Nepal

Particle Flow Analysis of Mechanical Properties and Failure Behaviour in Composite Rock Strata with Holes

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