Surface Morphology of Structural Plane and Effects of the Shear Strength Parameters

He, Dongliang; Yang, Weijun; Cheng, Yanhui

doi:10.1155/2018/5712403

Cited by 6 publications

(6 citation statements)

References 32 publications

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“…A mathematical model for shear strength versus number of joints is proposed as follows: where τ(n) is the shear strength of the structural plane when the number of joints is n (unit: MPa); n is the number of joints (units: bar); and a and b are parameters. e relationship between shear strength and number of joints is given by (1), which contains parameters a and b. When a and b have been determined, the shear strength corresponding to any number of joints can be derived.…”

Section: Formulation Of Mathematical Model Of the Shear Strength Of S...mentioning

confidence: 99%

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The Influence of the Number of Joints on the Size Effect of Shear Strength and Characteristic Strength

Zhang

Liang

et al. 2022

Mathematical Problems in Engineering

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The number of joints influences the shear and characteristic strength of structural plane; however, the relationship of the influence is yet to be derived. This study formulates 11 simulation programs using numerical simulation and realistic failure process analysis software. The influence of the number of joints and size on the shear strength of structural plane is studied. The stress-strain curves of different numbers of joints and sizes are analyzed. The mathematical models of the shear strength of structural plane and the number of joints and sizes are proposed, and their specific expressions are obtained. The mathematical models of the shear characteristic size and strength of structural plane and the number of joints are established.

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Section: Formulation Of Mathematical Model Of the Shear Strength Of S...mentioning

confidence: 99%

“…Shear strength is one of the important mechanical properties of rock, and the shear strength of rock structural plane has a size e ect [1]. ere are rock mass defects with di erent scales such as pores, voids, and structural planes in the rock mass [2].…”

Section: Introductionmentioning

confidence: 99%

The Influence of the Number of Joints on the Size Effect of Shear Strength and Characteristic Strength

Zhang

Liang

et al. 2022

Mathematical Problems in Engineering

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“…Its slope represents the tangent value of the internal friction angle, and its intercept represents the cohesion. ese two important parameters correspond to the friction and cohesive strengths, respectively [41]. Figure 7 shows the internal friction angle and cohesion of CGCAB of various ages as functions of the substitution rate.…”

Section: Shear Strengthmentioning

confidence: 99%

Effects of Corn Stalk Fly Ash (CSFA) on the Mechanical and Deformation Properties of Cemented Coal Gangue Backfill

Wang

Feng

et al. 2020

Advances in Materials Science and Engineering

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To reduce the amount of cement used in cemented coal gangue backfill (CCGB, a mixture of coal gangue, cement, fly ash, and water), mechanical and deformation properties of CCGB in which CSFA partially replaces the cement (0, 10, 20, 30, and 40 wt%) were studied. Compressive strength, acoustic emission during uniaxial loading, shear strength, and drying shrinkage were analysed. The compressive strength, shear strength, and drying shrinkage tests were performed at different curing times. The results showed that cemented coal gangue and corn stalk fly ash backfill (CGCAB) presented better performance, and the CGCAB with a 20% substitution rate had the best performance at day 28. Despite having the largest drying shrinkage value, 20% is the best choice for the substitution rate of CSFA. A 20% CSFA addition can enhance the bearing capacity of CGCAB and improve its failure mode, which is of great significance to support the upper overburden load and maintain the surface stability of the goaf.

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“…Peng C. et al [16] established a joint multilayer structure model considering elasticity, sliding deformation, shearing, and other shear mechanisms. He D et al [17] proposed a new method for simulating the typical structural plane of Barton, established a numerical model of complex structural planes, and discussed the influence of cohesion and internal friction angles on the shear strength of structural planes. Tang Z. et al [18] analyzed the limitations of the existing shear stress-displacement constitutive model, and proposed a hardening-softening fullshear constitutive model, using a single function to reflect the change characteristics of the joint shear displacement curve.…”

Section: Introductionmentioning

confidence: 99%

Statistical Damage Model of Rock Structural Plane Considering Void Compaction and Failure Modes

Zhang

et al. 2022

Symmetry

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The shear behavior of rock structural planes contains various symmetry laws, and the shear failure can be considered as an asymmetric state of the rock and rock mass. The study of shear deformation and the failure of rock structural planes plays a vital role in ensuring the safety and stability of engineered rock masses. In view of the inability of traditional shear constitutive models to describe the non-linear characteristics of the dilatancy stage and the single applicable failure form, firstly, we discuss, in depth, the law and mechanism of shear deformation and failure of structural planes, and introduce the compaction index α to measure the non-linear characteristics of shear stress–shear displacement caused by compaction of microcracks and internal pores of structural planes, and the structural plane damage model, considering the void compaction and failure mode, was established. Then, the statistical damage theory was introduced, and the strength and failure of the microunits of the rock structural plane were assumed to obey the Weibull distribution. Based on the Mohr-Coulomb strength criterion to measure the strength of the microunits of the rock structure surface, a statistical damage model of structural planes, which can describe void compaction and failure modes, was established. Finally, a comparative analysis was carried out with the test curve, and the results showed that: the calculation curve of the structural plane statistical damage model established, considering the void compaction and failure modes, has the same trend as the structural plane shear test curve, which can better describe the shear stress– shear displacement at the dilatancy stage, as well as the shearing stage and sliding stage in different failure modes. The changing law of shear displacement reflects the rationality and accuracy of the constructed constitutive model. The research results can provide a theoretical basis for the shear deformation and failure of rock structural planes.

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Surface Morphology of Structural Plane and Effects of the Shear Strength Parameters

Cited by 6 publications

References 32 publications

The Influence of the Number of Joints on the Size Effect of Shear Strength and Characteristic Strength

The Influence of the Number of Joints on the Size Effect of Shear Strength and Characteristic Strength

Effects of Corn Stalk Fly Ash (CSFA) on the Mechanical and Deformation Properties of Cemented Coal Gangue Backfill

Statistical Damage Model of Rock Structural Plane Considering Void Compaction and Failure Modes

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