Numerical model for rock bolts with consideration of rock joint movements

Marenče, M.; Swoboda, G.

doi:10.1007/bf01020149

Cited by 28 publications

(7 citation statements)

References 3 publications

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“…• The distribution of deformation in the grout in the radial direction is based on SLM for axisymmetric bodies. This assumption saves a discretization in the radial direction of grout [20] and estimates a material parameter (k g ) that describes the interaction between rock bolt and grout material.…”

Section: Weak Formulation Of Bolt-grout Interactionmentioning

confidence: 99%

Enriched finite element procedures for analyzing decoupled bolts installed in rock mass

Deb

Das

2010

Num Anal Meth Geomechanics

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SUMMARYNumerical procedures are developed to analyze interaction between fully grouted bolts and rock mass using 'enriched finite element method (EFEM)'. A solid element intersected by a rock bolt along any arbitrary direction is termed as 'enriched' element. The nodes of an enriched element have additional degrees of freedom for determining displacements, stresses developed in the bolt rod. The stiffness of the enriched element is formulated based on properties of rock mass, bolt rod and grout, orientation of the bolt and borehole diameter. Decoupling at grout-bolt interface and elasto-plastic behavior of rock mass have also been incorporated into the EFEM procedures. The results of this method are compared with analytical pull-out test results presented by Li and Stillborg (Int. J. Rock Mech. Min. Sci. 1999; 36:1013-1029). In addition, a numerical example of a bolted tunnel is provided to demonstrate the efficacy of the proposed method for practical applications.

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Section: Weak Formulation Of Bolt-grout Interactionmentioning

confidence: 99%

Enriched finite element procedures for analyzing decoupled bolts installed in rock mass

Deb

Das

2010

Num Anal Meth Geomechanics

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“…Rock bolt is a part of a series of support methods, denoted as "rock reinforcement system." e mechanism of the bolted rock masses is widely investigated by analytical analysis, laboratory and field tests, and numerical simulations, which includes the bonding capacity of rock bolts and the interfaces properties between the bolts and rocks [1][2][3][4][5][6][7]. Some investigations focus on the constitutive relationships of the bolted rock masses.…”

Section: Introductionmentioning

confidence: 99%

“…To simplify the numerical calculations of the bolted rock masses, many investigations assume that the constitutive model of the rocks is not changed after the bolts installed, but the mechanical parameters of the bolted rock masses are strengthened comparing with the rock masses before rock bolts are applied [17][18][19]. Most published literature indicated that the rock reinforcement effect could be equivalently simulated by improving the parameters of surrounding rock masses [3,15,20,21] but the increased value of the parameters such as elastic modulus, cohesive, and internal friction angles of the surrounding rock masses needs to be further investigated.…”

Section: Introductionmentioning

confidence: 99%

Primary Investigation on Equivalent Anchoring Method of Jointed Rock Mass Tunnel and Its Engineering Application

Gao

Jia

2020

Advances in Civil Engineering

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Rock bolts, one of the main support structures of the tunnel, can improve the stress state and mechanical properties of the surrounding rocks. The rock bolts are simulated by bar or beam elements in present numerical calculations for most 2D tunnel models. However, the methods of simulating rock bolt in three-dimensional models are rarely studied. Moreover, there are too many rock bolts in the long-span tunnel, which are hardly applied in the 3D numerical model. Therefore, an equivalent anchoring method for bolted rock masses needs to be further investigated. First, the jointed material model is modified to simulate the anisotropic properties of surrounding rock masses. Then, based on the theoretical analysis of rock bolts in reinforcing mechanical properties of the surrounding rock masses, the equivalent anchoring method of the jointed rock mass tunnel is numerically studied. The equivalent anchoring method is applied to the stability analysis of a diversion tunnel in Western China. From the calculation results, it could be found that the reinforcement effect of rock bolts could be equivalently simulated by increasing the mechanical parameter value of surrounding rocks. For the jointed rock mass tunnel, the cohesion and internal friction angle of the surrounding rocks are improved as 1.7 times and 1.2 times of the initial value, which can simulate the reinforcement effect of rock bolts. Comparing with analytical results, the improved internal friction angle is nearly consistent with analytical result. The reinforcement effect of rock bolts is simulated obviously when the mechanical parameters of surrounding rocks are increased simultaneously. The engineering application shows that the equivalent anchoring method can reasonably simulate the effect of rock bolts, which can provide reference for stability analysis of three-dimensional tunnel simulations.

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“…Numerical simulation of joints, bolts and lining can be carried out using the explicit (or distinct) method [4][5][6][7][8][9][10][11] or the implicit (or equivalent) method [12][13][14][15][16][17]. The former describes the individual behavior of the bolt and lining, while the latter uses an equivalent approach which is well adapted for complex engineering problems with a large number of joints and bolts.…”

Section: Introductionmentioning

confidence: 99%

Finite element analysis of jointed rock masses reinforced by fully-grouted bolts and shotcrete lining

Chen¹,

Fu²,

Shahrour³

2009

International Journal of Rock Mechanics and Mining Sciences

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Numerical model for rock bolts with consideration of rock joint movements

Cited by 28 publications

References 3 publications

Enriched finite element procedures for analyzing decoupled bolts installed in rock mass

Enriched finite element procedures for analyzing decoupled bolts installed in rock mass

Primary Investigation on Equivalent Anchoring Method of Jointed Rock Mass Tunnel and Its Engineering Application

Finite element analysis of jointed rock masses reinforced by fully-grouted bolts and shotcrete lining

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