Cavern roof stability—mechanism of arching and stabilization by rockbolting

Ziping, Huang; Broch, Einar; Lu, Ming

doi:10.1016/s0886-7798(02)00010-x

Cited by 73 publications

(26 citation statements)

References 4 publications

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“…Hibino et al (1983) provided evidences of natural arch forming. Huang et al (2002) claimed that a natural rock cavern roof arch would form near the roof surface after excavation with a certain magnitude of in-situ horizontal stress, reasonable quality of the rock mass and arch shaped roof. Li (2006aLi ( , 2007 physically demonstrated the existence of pressure arch through the core discing phenomena during core logging around a mine drift located at a depth of about 1000 m. Li (2006b) successfully applied the concept of pressure arch to stabilize a metal mine stope at a depth of about 1000 m below the surface through establishing pressure arch in the roof and the hanging wall by bolt-shotcrete ribs.…”

Section: Contents Lists Available At Sciencedirectmentioning

confidence: 99%

“…If the shear resistance cannot sustain the dead weight of the beam, sliding failure along the two ends occurs. The action of the arch can be described by the thrust line, which is a polygon representing the equilibrium of the given loading (Huang et al, 2002). If the thrust line exceeds its upper boundary, the voussoir beam will experience a snap-through failure.…”

Section: Formation Of Pressure Archmentioning

confidence: 99%

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Numerical investigation of arching mechanism to underground excavation in jointed rock mass

Liu

Zhang

2015

Tunnelling and Underground Space Technology

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Section: Contents Lists Available At Sciencedirectmentioning

confidence: 99%

Section: Formation Of Pressure Archmentioning

confidence: 99%

Numerical investigation of arching mechanism to underground excavation in jointed rock mass

Liu

Zhang

2015

Tunnelling and Underground Space Technology

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“…They reinforce and mobilize the inherent strength of the rock mass by offering internal and confining pressure (Huang, 2002). Therefore, it is assumed in this paper, the grouted rockbolts reduce and control tunnel convergence through increasing the radial stress within the plastic rock mass.…”

Section: The First Methodsmentioning

confidence: 99%

New Analytical Approaches for Evaluating the Performance of Systematic Pre-Tensioned Fully Grouted Rockbolts in Tunnel Stabilization

Ranjbarnia

Fahimifar

Oreste

2016

Archives of Mining Sciences

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In this paper, two new analytical approaches are presented on the basis of convergence-confinement method to compute both the ultimate convergence of circular tunnel and its plastic zone having been reinforced by systematically pre-tensioned fully grouted rockbolts. The models have two basic assumptions: (1) the grouted rockbolts increase the radial internal pressure within a broken rock mass by both the pre-tensioned force and the probable following induced force due to rock mass movement (2) tunnel convergence (specially short-term) occurs only due to reducing and diminishing of the radial constrained stress on tunnel surface provided by the working face. Hence, the values of both the pre-tensioned pressure and the mentioned radial constrained stress are specially taken into consideration in this paper. That is, according to their magnitudes, two different conditions occur: the magnitude of pre-tensioned pressure is greater than that of the constrained stress at bolt installation time and vice versa. The solutions are extended to each of conditions, and illustrative examples are solved. The proposed approaches predicting almost identical results show that pre-tensioning of grouted rockbolts will increase the efficiency and effectiveness of rockbolts.Keywords: analytical approach; tunneling design; convergence-confinement method; pre-tensioned fully grouted rockbolt W pracy tej przedstawiono dwie analityczne metody oparte na metodzie badania konwergencji i naprężeń wymuszonych wykorzystane do obliczania zarówno granicznej konwergencji tunelu o przekroju koła oraz zachowania strefy plastycznej, po wzmocnieniu tunelu za pomocą wstępnie naprężanych i zacementowanych kotew. Model opiera się dwóch założeniach: (1) zacementowane kotwy prowadzą do wzrostu ciśnienia wewnętrznego w kierunku promieniowym w kruszonym materiale skalnym, spowodowanego siłą wstępnego naprężenia oraz siłą spowodowaną przez ruchy górotworu; (2) -konwergencja

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“…Disasters such as collapse and large deformation may occur during the stress redistribution [1][2][3], in which the original joints propagate and coalesce [4,5]. The joints are filled with organic materials and/or gauges of rocks, which can significantly influence the mechanical behavior of the rocks.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Joint Dip Angle on the Mechanical Behavior of Infilled Jointed Rock Masses under Uniaxial and Biaxial Compressions

et al. 2018

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Due to the complex formation process of a rock mass, a large number of fissures, joints, faults, other defects exist and the defects commonly contain infilled materials. The jointed rock masses are in a complex geological environment, in which the geometric distribution and the boundary condition can greatly affect the mechanical behavior of the infilled jointed rock mass. In this study, the infilled jointed rock mass specimens with different dip angles are prepared using similar materials, and the uniaxial and biaxial compression tests on the specimens are conducted. The effect of the joint dip angle on the mechanical behavior of the infilled jointed rock mass under uniaxial and biaxial compressions is investigated. The results show that the uniaxial compressive strength shows a W-shaped variation, and the biaxial compressive strength shows a V-shaped variation with an increase in the dip angle. Most of the cracks appear in pairs around the joint and occur symmetrically in a bilateral distribution, and the existence of the infilled joints induces a nonlinear mechanical behavior in the specimen. In addition, the specimens exhibit three failure modes under uniaxial compression: splitting failure, step-path failure and planar failure. The specimens present two failure modes under biaxial compression: splitting failure and planar failure.

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Cavern roof stability—mechanism of arching and stabilization by rockbolting

Cited by 73 publications

References 4 publications

Numerical investigation of arching mechanism to underground excavation in jointed rock mass

Numerical investigation of arching mechanism to underground excavation in jointed rock mass

New Analytical Approaches for Evaluating the Performance of Systematic Pre-Tensioned Fully Grouted Rockbolts in Tunnel Stabilization

The Effect of Joint Dip Angle on the Mechanical Behavior of Infilled Jointed Rock Masses under Uniaxial and Biaxial Compressions

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