Experimental and numerical research on triaxial mechanical behavior of self-compacting concrete subjected to freeze–thaw damage

Zhu, Xiangyi; Chen, Xudong; Zhang, Nan; Wang, Xinquan; Diao, Hongguo

doi:10.1016/j.conbuildmat.2021.123110

Cited by 37 publications

(7 citation statements)

References 44 publications

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“…Mahboubi et al 22 conducted the conventional triaxial compression test of plastic concrete, it was found that the compressive strength follows the changes in the confining pressure, which also results in changes in the elastic modulus and deformation. Zhu et al 23 obtained the same conclusion through the freeze-thaw test of self-compact concrete and also found that the sensitivity to confining pressure gradually increased with the increase of the number of freeze-thaw cycles. Moreover, the current research on the triaxial conpressive properties of concrete mainly focuses on normal aggregate concrete (NAC), and coral aggregate is different from ordinary crushed stone aggregate in material, hence the triaxial law of NAC may not well applicable in CAC.…”

Section: Introductionmentioning

confidence: 58%

Mechanical properties and constitutive model of coral aggregate concrete subjected to dynamic uniaxial and triaxial compression

Deng

Jiang

et al. 2022

Structural Concrete

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The dynamic compressive mechanical performance of coral aggregate concrete (CAC) has been studied by the servo-controlled true triaxial testing machine (TAWZ-5000/3000), the failure modes and the stress-strain curves were obtained under various loading conditions. The effect of strain rates and the constant lateral pressure on the strength, deformation capacity, and failure modes of CAC were analyzed according to the results obtained from the test.The results show that the lateral pressure significantly changes the failure mode while the strain rate only affects the degree. The strength and deformation capacity will improve with the increase of strain rate and lateral pressure, and the lateral pressure diminishes the strain rate effect on mechanical properties. A 5-parameter empirical dynamic failure criterion was established based on the William-Warnke criterion. Finally, a 2-stage dynamic multiaxial compressive constitutive model obeying the Weibull and Lognormal statistical distributions was established, and the model had well-fitting results with the experimental results. K E Y W O R D S constitutive model, coral aggregate concrete, failure criterion, lateral pressure, mechanical properties, strain rate

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Section: Introductionmentioning

confidence: 58%

Mechanical properties and constitutive model of coral aggregate concrete subjected to dynamic uniaxial and triaxial compression

Deng

Jiang

et al. 2022

Structural Concrete

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“…This that only axial crack closure strain develops during the deviatoric loading stage (𝛥𝜀 𝑐 2 = 𝛥𝜀 𝑐 3 = 0), which is consistent with the experimental observations. 39,57,58 Therefore, the criterion (8) can uniformly capture the crack closure strain evolution under two stages. For instance, considering the maximum crack closure strain is 0.7% (purple dash line in Figure 8C,D), the cracks partially closed under hydrostatic loading, and the rest part closed during deviatoric loading.…”

Section: Numerical Simulationsmentioning

confidence: 99%

“…In the deviatoric loading stage (Figure 8B), the axial stress is applied incrementally in the axial direction until the failure of rock sample. During this stage, ϱ can be expressed as

\begin{equation} \bm{\varrho }={\left[ \def\eqcellsep{&}\begin{array}{ccc}1 & 0 & 0 \\[3pt] 0 & 0 & 0 \\[3pt] 0 & 0 & 0 \end{array} \right]} \end{equation}

This implies that only axial crack closure strain develops during the deviatoric loading stage (

\varDelta \varepsilon _{2}^{c}=\varDelta \varepsilon _{3}^{c}=0

), which is consistent with the experimental observations 39,57,58 . Therefore, the criterion (8) can uniformly capture the crack closure strain evolution under two stages.…”

Section: Evaluation and Verification Of The Proposed Modelmentioning

confidence: 99%

A nonlinear constitutive model for whole stress–strain behaviors of compressed rocks incorporating crack closure effect

Ren

Zhao

Niu

et al. 2023

Num Anal Meth Geomechanics

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This paper is devoted to establishing a nonlinear constitutive model incorporating crack closure effect for capturing the whole process of rock deformation and failure behavior under compression. The model formulated in the framework of irreversible thermodynamics is based on the additive decomposition of the total strain into crack closure strain, elastic, and plastic parts. New specific criteria are proposed for the description of crack closure strain and plastic strain evolution. Notably, analytical solutions of the model under conventional triaxial compression loading conditions are derived. For application, a robust semi‐implicit return mapping (SRM) algorithm with a crack closure strain correction and a plastic strain correction is developed. The analytical solutions, herein, are subtly used to calibrate model parameters and as reference results for assessing the accuracy and robustness of the SRM algorithm. Validation of the model conducted by comparing with experimental data from the literature shows that the model can properly describe the nonlinear mechanical behaviors of rocks, including crack closure effect, strain hardening/softening, peak and residual strength, as well as volumetric compaction/dilation transition. In addition, a nonlocal formulation is introduced as an extension of the model to remedy the mesh dependency problem.

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“…Peng and Song et al [19,20] analyzed and summarized the surface movement and deformation characteristics of loess gully landform and the key technologies of ecological restoration. erefore, the study on the law of surface subsidence in HIFMCMWFSTBTE in hilly areas is of great significance for improving the basic theory of mining subsidence and guiding on-site production [21][22][23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Field Study on the Law of Surface Subsidence in the High‐Intensity Fully Mechanized Caving Mining Working Face with Shallow Thick Bedrock and Thin Epipedon in Hilly Areas

Tan

Cheng

Gong

et al. 2021

Advances in Materials Science and Engineering

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Shallow and thick coal seams occur extensively in hilly areas in Shanxi Province and Shaanxi Province, China. The surface damage and landslides caused by shallow fully mechanized caving mining have a very serious impact on the environment. To provide a theoretical and reference foundation for mine environmental protection in hilly settings, a research on surface movement of the high-intensity fully mechanized caving mining working face with shallow thick bedrock and thin epipedon (HIFMCMWFSTBTE) is urgently needed. In this study, using the P2 working face of a mine as the research object, three surface subsidence observation lines were arranged in this working face to analyze the dynamic change characteristics of surface subsidence. Besides, the law of surface movement, mining sufficiency, fracture development and distribution characteristics, subsidence speed, and surface movement duration of HIFMCMWFSTBTE in hilly areas were comparatively studied. The research results reveal that the upper part of the slope slides towards the downhill direction under the action of tensile stress or push stress. As a result, the range of the horizontal movement towards the downhill direction of the slope and the range of surface movement both increase, and the movement angle and boundary angle both decrease compared with the plain. HIFMCMWFSTBTE is prone to serious sudden discontinuous damage. Fractures on the gully region surface develop along the contour, forming a crisscross fracture network, and the fractures are not easy to close after being generated. HIFMCMWFSTBTE in hilly areas can achieve full mining more easily than those of other geological conditions. According to the field measurement, critical full mining can be achieved in P2 working face when the ratio of mining width to mining depth is 1.07. The surface movement duration of HIFMCMWFSTBTE in hilly areas is relatively short. Considerable subsidence will occur in the active stage, and the surface subsidence is sudden and violent. The measured surface stabilization time of the P2 working face is only 20% of the calculated value in the Specification for Coal Pillar Reservation and Coal Mining under Buildings, Water Bodies, Railways, and Main Shafts (hereinafter referred to as the Specification), indicating that the specification's empirical formula is inapplicable to the calculation of surface stabilization time of the P2 working face.

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Experimental and numerical research on triaxial mechanical behavior of self-compacting concrete subjected to freeze–thaw damage

Cited by 37 publications

References 44 publications

Mechanical properties and constitutive model of coral aggregate concrete subjected to dynamic uniaxial and triaxial compression

Mechanical properties and constitutive model of coral aggregate concrete subjected to dynamic uniaxial and triaxial compression

A nonlinear constitutive model for whole stress–strain behaviors of compressed rocks incorporating crack closure effect

Field Study on the Law of Surface Subsidence in the High‐Intensity Fully Mechanized Caving Mining Working Face with Shallow Thick Bedrock and Thin Epipedon in Hilly Areas

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