Joint Inclination Effect on Strength, Stress-Strain Curve and Strain Localization of Rock in Plane Strain Compression

Wang, X.B.

doi:10.4028/www.scientific.net/msf.495-497.69

Cited by 8 publications

(6 citation statements)

References 12 publications

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“…The uniaxial test adopts force control, and the control speed is 100 N/s until the test is completed. Generally, the stress-strain curve of rock samples will go through four stages during uniaxial compression [27,28], as shown in Figure 1.…”

Section: Mechanical Behavior Of Rock Under Thementioning

confidence: 99%

Effects of Heating and Liquid Nitrogen on Mechanical Characteristics and Rockburst Characteristics of Granite

Xue

Dang

et al. 2023

Geofluids

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Due to the depletion of shallow resources and the reduction of the space for human life and development, in recent years, human beings began to gradually expand to the deep underground. The increase of development depth will bring a series of safety problems, so it is particularly important to study and deal with rockburst. In this paper, based on laboratory tests, relevant literature, and research at home and abroad, the TAWD-2000 electrohydraulic servo rock mechanics testing machine and PIC-2 acoustic emission (AE) testing system are used. Uniaxial compression tests and AE monitoring tests were carried out on granite samples to analyze the property and AE characteristic parameters of granite under the action of liquid nitrogen (LN2) and to further study the fracture mode of granite. The following conclusions can be obtained: the LN2 cooling has a deterioration influence on the strength of rock, and the elastic modulus and peak stress of granite show a downward trend with the increasing number of cycles. With the cycle times of LN2 actions increasing, the AE ring count of granite and the frequency and amplitude of energy in each stage have an upward trend. When the rock reaches the failure stage, the energy at the catastrophe point increases, and the ring count also increases sharply. The RA-AF diagram of AE parameters can characterize two failure modes of rock, tensile failure and shear failure. In the process of fracture of granite samples, shear cracks dominate, leading to shear failure or compression failure of granite. Based on the method of elastic energy, the tendency index of rockburst of granite samples under different working conditions is calculated. The tendency of rockburst decreases with the decrease of elastic modulus. Under the repeated action of LN2, the tendency of rockburst of granite samples presents a downward trend, and the action of LN2 reduces the probability of rockburst to a certain extent.

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Section: Mechanical Behavior Of Rock Under Thementioning

confidence: 99%

Effects of Heating and Liquid Nitrogen on Mechanical Characteristics and Rockburst Characteristics of Granite

Xue

Dang

et al. 2023

Geofluids

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“…The fault overlap is equal to the distance between two faults, i.e., 1.84 × 10 −2 m. The specimen is divided into 300 × 300 elements and faults are composed of 1.493 × 10 3 elements. Elements in faults are determined through their centroid coordinates by use of a written FISH function for identifying a joint in rock specimens [Wang 2005;2007a]. The present numerical model represents a plane strain problem and only a small strain mode is permitted.…”

Section: Numerical Model and Constitutive Parametersmentioning

confidence: 99%

“…The principal objective of this paper is to examine these problems numerically by use of FLAC ("Fast Lagrangian Analysis of Continua"), an explicit finite-difference code that can be used to model geologic structures [Strayer and Hudleston 1997;McKinnon and de la Barra 1998;Erickson et al 2001], rock specimens with imperfections and joints, [Wang 2005;Wang 2007a;Wang 2007b;Wang 2007c; and heterogeneous rock specimens [Cundall 1989;Fang and Harrison 2002;Wang and Pan 2008;Wang and Zhang 2009].…”

Section: Introductionmentioning

confidence: 99%

Untitled

2010

J. Mech. Mater. Struct.

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A semianalytical solution is presented for bending of moderately thick fully clamped laminated doubly curved panels using the extended Kantorovich method (EKM). The panel is subjected to uniform and nonuniform distributed loading and cut from a rectangular platform. Based on the first-order shear deformation theory, five highly coupled second-order partial differential equations in terms of displacement components are derived. Assuming separable functions for panel displacements together with the EKM converts the governing equations into double sets of ordinary differential equations with constant coefficients in terms of x and y. The resulting ODE systems are then solved iteratively until a level of prescribed convergence is achieved. Closed-form solutions can be presented for ODE systems in each iteration. Efficiency and rapid convergence of the solution technique are examined using several examples. Predictions of both deflection and stress resultants show very good agreement with other available results in the literature. It is also shown that the same formulation and solution method can be used to obtain results for spherical and cylindrical panels and rectangular plates.

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“…These functions may be used to extend the usefulness of FLAC and to add user-defined features. A FISH function is written to automatically find addresses of elements in the joint [6][7].…”

Section: Fish Function Written For Identifying Elements In Jointmentioning

confidence: 99%

“…An inclined joint with a certain thickness can be modeled by many square elements [6]. Using FLAC, effects of joint inclination on strength, stress-strain curve and strain localization of JRS in plane strain compression were investigated [7]; effects of joint inclination on overall deformational characteristics (stress-lateral strain curve, lateral strain-axial strain curve, volumetric strain-axial strain and calculated Poisson's ratio-axial strain curve) and precursor to failure were investigated [8].…”

Section: Introductionmentioning

confidence: 99%

Effects of Joint Width on Strength, Stress-Strain Curve and Strain Localization of Rock Mass in Uniaxial Plane Strain Compression

Wang

2007

KEM

Self Cite

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Effects of joint width (JW) on the macroscopic stress-strain curve, the failure process and mode of jointed rock specimen (JRS) in plane strain compression are modeled by use of FLAC. The failure criterion of intact rock outside the inclined joint is a composite Mohr-Coulomb criterion with tension cut-off and the linear strain-softening post-peak constitutive relation is adopted. The joint is treated as quadrate elements of ideal plastic material beyond the peak strength. A written FISH function is used to automatically find elements in the joint. Numerical results show that the peak strength of JRS depends on JW and is lower than that of intact rock specimen without joint. For JRS, the shear strains are concentrated into the joint or the new generated shear bands (NGSBs); the peak strength decreases with an increase of JW. At lower or higher joint inclination angle (JIA), the failure mode and pattern of NGSBs are not related to JW. The post-peak response becomes ductile at wider JW and higher JIA. The post-peak slope of stress-strain curve at lower JIA is not dependent on JW since the width and inclination angle of NGSBs are not affected by JW.

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Joint Inclination Effect on Strength, Stress-Strain Curve and Strain Localization of Rock in Plane Strain Compression

Cited by 8 publications

References 12 publications

Effects of Heating and Liquid Nitrogen on Mechanical Characteristics and Rockburst Characteristics of Granite

Effects of Heating and Liquid Nitrogen on Mechanical Characteristics and Rockburst Characteristics of Granite

Untitled

Effects of Joint Width on Strength, Stress-Strain Curve and Strain Localization of Rock Mass in Uniaxial Plane Strain Compression

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