Failure characteristics of intermittent fissures under a compressive-shear test: Experimental and numerical analyses

Cao, Ri; Cao, Ping; Lin, Hang; Ma, Guowei; Chen, Yun

doi:10.1016/j.tafmec.2017.11.002

Cited by 76 publications

(22 citation statements)

References 41 publications

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“…Under a certain normal load, the unbolted joint underwent shear deformation. When the shear stress reached the peak shear strength, the joint suffered a sliding failure [47][48][49][50][51][52][53]. e bolt plays an important role in the bolted joint.…”

Section: Failure Mode Of Jointmentioning

confidence: 99%

Anchor Stress and Deformation of the Bolted Joint under Shearing

Lin

Zhu

Yang

et al. 2020

Advances in Civil Engineering

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Bolts are widely used in rock mass engineering, wherein the bolt support improves the safety and stability of the rock mass. To reveal the mechanical behavior of the bolt and failure mechanism of the bolted joint in the shearing process, a direct shear test was conducted by changing the state of grouting, number of bolt, and inclination angle of the bolt. The change in the axial force of the anchor in the shearing process was evaluated by conducting a strain gauge test, and the mechanical behavior of the bolt under the external force was studied. The results showed that under the same normal stress, the yield displacement of the bolt decreased and the stiffness of the joint gradually increased with increased number of bolts. At the same number of bolts, their yield displacement increased with increased normal stress. Analysis further revealed that grouting on the joint improved the force condition of the bolt, increased the yield displacement of the bolt, and coordinated the deformation of the grouting body and bolt, thereby improving the shear strength of the joint. Lastly, when the anchor angles differed, the axial pulling resistance of the anchor changed, and the yield displacement of the anchor with 45° inclination was <90°. The yield displacement of the bolt showed that the supporting effect of the bolt with a 45° inclination was better than that of the bolt with a 90° inclination.

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Section: Failure Mode Of Jointmentioning

confidence: 99%

Anchor Stress and Deformation of the Bolted Joint under Shearing

Lin

Zhu

Yang

et al. 2020

Advances in Civil Engineering

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“…To capture and improve the behavior of geological materials, many studies have been carried out [8][9][10][11][12][13][14][15][16][17]. In many engineering applications, however, soils with unsatisfactory engineering properties are encountered [18,19], triggering the rapid development and wide application of soil improvement…”

Section: Introductionmentioning

confidence: 99%

Behavior of Fiber-Reinforced and Lime-Stabilized Clayey Soil in Triaxial Tests

Wang

Guo

et al. 2019

Applied Sciences

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The beneficial role of combining fiber reinforcement with lime stabilization in altering soil behavior has been established in the literature. However, the coupling effect of their combination still remains unclear in terms of its magnitude and microscopic mechanism, especially for natural fibers with special microstructures. The objective of this study was to investigate the coupling effect of wheat straw fiber reinforcement and lime stabilization on the mechanical behavior of Hefei clayey soil. To achieve this, an experimental program including unconsolidated–undrained (UU) triaxial tests and SEM analysis was implemented. Static compaction test samples were prepared on untreated soil, fiber-reinforced soil, lime-stabilized soil, and lime-stabilized/fiber-reinforced soil at optimum moisture content with determining of the maximum dry density of the untreated soil. The lime was added in three different contents of 2%, 4%, and 6%, and 13 mm long wheat straw fiber slices with a cross section one-quarter that of the intact ones were mixed in at 0.2%, 0.4%, and 0.6% by dry weight of soil. Analysis of the derived results indicated that the addition of a small amount of wheat straw fibers into lime-stabilized soil improved the intensity of the strain-softening behavior associated with mere lime stabilization. The observed evidence that the shear strength increase brought by a combination of 0.4% fiber reinforcement and 4% lime stabilization was smaller than the summation of the shear strength increases brought by their presence alone in a sample demonstrated a coupling effect between fiber reinforcement and lime stabilization. This coupling effect was also detected in the comparisons of the secant modulus and failure pattern between the combined treatment and the individual treatments. These manifestations of the coupling effect were explained by a microscopic mechanism wherein the fiber reinforcing effect was made more effective by the ways in which lime chemically stabilized the soil and lime stabilization development was quickened by the water channels passing through the surfaces and honeycomb pores of the wheat straw fibers.

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“…Hao and Azzam investigated the effects of interlayer dips, interlayer shear strength, and interlayer locations relative to the underground structure by using UDEC. Cao et al discussed the failure characteristics of intermittent fissures under a compressive‐shear test using DEM. Chen et al studied stability of the surrounding rock around a cavern under different hydrogeological conditions using DDA.…”

Section: Introductionmentioning

confidence: 99%

“…In terms of the continuum-based methods, finite element method (FEM), 16,17 finite difference method (FDM), 18 boundary element method (BEM), 19 extended finite element method (XFEM), [20][21][22] phantom node method, 23 strain softening elements, 24 and specific meshfree methods, [25][26][27] such as bond particle method (BPM), 28,29 peridynamics (PD), 30-33 smoothed particle hydrodynamics (SPH), 34 and general particle dynamics (GPD), 35,36 were developed to investigate interlayers and crack problems. In terms of the discontinuum-based methods, distinct lattice spring model (DLSM), 37 discrete element method (DEM), [38][39][40][41][42] discontinuous deformation analysis (DDA), [43][44][45] and numerical manifold method (NMM) [46][47][48] were developed.…”

Section: Introductionmentioning

confidence: 99%

Simulation of cracking behaviours in interlayered rocks with flaws subjected to tension using a phase‐field method

Zhou

Jia

Berto

2019

Fatigue Fract Eng Mat Struct

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A phase‐field method (PFM) is used to investigate cracking behaviours, including crack initiation and propagation, in interlayered rocks with preexisting flaws subjected to tension. An example with a bi‐material plate with a centre flaw is used to validate the PFM. Then, numerical simulations of cracking behaviours in interlayered rocks with a single flaw and a cross‐flaw are carried out using PFM. Moreover, the load‐displacement responses are numerically investigated. The PFM numerical results show that the crack propagation trajectories and peak loads of rock specimens depend on the preexisting flaw configuration and the mechanical properties of the interlayers.

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Failure characteristics of intermittent fissures under a compressive-shear test: Experimental and numerical analyses

Cited by 76 publications

References 41 publications

Anchor Stress and Deformation of the Bolted Joint under Shearing

Anchor Stress and Deformation of the Bolted Joint under Shearing

Behavior of Fiber-Reinforced and Lime-Stabilized Clayey Soil in Triaxial Tests

Simulation of cracking behaviours in interlayered rocks with flaws subjected to tension using a phase‐field method

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