Analysis of fracturing characteristics of unconfined rock plate under edge-on impact loading

Wang, Yixian; Lin, Hang; Zhao, Yanlin; Li, Xian; Guo, Panpan; Liu, Yan

doi:10.1080/19648189.2018.1509021

Cited by 54 publications

(27 citation statements)

References 21 publications

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“…These techniques fall into three main categories: physical techniques (e.g., vibration [20,21]), mechanical techniques [22], and chemical techniques (e.g., admixture stabilization [23]).Reinforcing soil using randomly distributed fibers dates from more than 5000 years ago when plant roots and stems were used to reinforce building blocks. This technique still remains a hot research issue nowadays and its application fields are widening [24][25][26][27]. The advantages of mixing fibers into soil include increases in shear, compressive, and tensile strength [28][29][30][31]; a reduction in the swelling tendency of expansive soil [32][33][34]; reduced brittleness [35][36][37][38]; and so forth.…”

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

Wang

Guo

et al. 2019

Applied Sciences

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“…Miller divided the stress-strain curves of rocks with different physical and mechanical properties into six categories [42,43]. e third category is called the plasticelastic deformation feature, in which the stress-strain curve is concave in the initial stage and then becomes a straightline segment until destruction [44][45][46]. Rocks with many pores and microfractures, such as granite and sandstone, reflect this deformation characteristic [47,48].…”

Section: Specimen Preparation and Test Methodsmentioning

confidence: 99%

Improved Nonlinear Nishihara Shear Creep Model with Variable Parameters for Rock‐Like Materials

Lin

Zhang

Wang

et al. 2020

Advances in Civil Engineering

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Creep property is an important mechanical property of rocks. Given the complexity of rock masses, mechanical parameters change with time in the creep process. In this work, a nonlinear function for describing the time-dependent change of parameters was introduced and an improved variable-parameter nonlinear Nishihara shear creep model of rocks was established. By creating rock-like materials, the mechanical properties of rocks under the shear creep test condition were studied, and the deformation characteristics and long-term shear strength of rocks during creep were analyzed. The material parameters of the model were identified using the creep test results. Comparison of the model’s calculated values and experimental data indicated that the model can describe the creep characteristics of rocks well, thus proving the correctness and rationality of the improved model. During shear creep, the mechanical properties of rocks have an aging effect and show hardening characteristics under low shear stress. Furthermore, according to the fact that Gk of the nonlinear model can characterize the creep deformation resistance, a method to determine the long-term shear strength is proposed.

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“…In Figure 6, the various crack types initiated from the preexisting flaws identified by Yang et al [28] and Wong and Einstein [43] are shown. Furthermore, substantial experimental efforts have illustrated cracks with similar characteristics in the specimens with single fissure [10,11,34,77,78,99,[103][104][105].…”

Section: Advances In Civil Engineeringmentioning

confidence: 99%

Crack Initiation, Propagation, and Failure Characteristics of Jointed Rock or Rock‐Like Specimens: A Review

Cao

Lin

Fan

et al. 2019

Advances in Civil Engineering

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Rock masses are heterogeneous materials containing a large number of discontinuities, and the failure of the natural rock mass is induced by the crack propagation and coalescence of discontinuities, especially for the rock mass around tunnel or underground space. Because the deformation or failure process of jointed rock mass exhibits strongly nonlinear characteristics, it is also very difficult to predict the strength and failure modes of the rock mass. Therefore, it is very necessary to study the failure mechanisms of jointed rock mass under different stress conditions. Apart from the stress condition, the discontinuities geometry also has a significant influence on the mechanical behavior of jointed rock mass. Then, substantial, experimental, and numerical efforts have been devoted to the study of crack initiation, propagation, and coalescence of rock or rock-like specimens containing different kinds of joints or fissures. The purpose of this review is to discuss the development and the contribution of the experiment test and numerical simulation in failure behavior of jointed rock or rock-like specimens. Overall, this review can be classified into three parts. It begins by briefly explaining the significance of studying these topics. Afterwards, the experimental and numerical studies on the strength, deformation, and failure characteristics of jointed rock or rock-like materials are carried out and discussed.

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Analysis of fracturing characteristics of unconfined rock plate under edge-on impact loading

Cited by 54 publications

References 21 publications

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

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

Improved Nonlinear Nishihara Shear Creep Model with Variable Parameters for Rock‐Like Materials

Crack Initiation, Propagation, and Failure Characteristics of Jointed Rock or Rock‐Like Specimens: A Review

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