Dynamic stress accumulation model of granite residual soil under cyclic loading based on small-size creep tests

Tang, Liansheng; Zhao, Zhanlun; Chen, Hao-kun; Wu, Yanping; Zeng, Yongmei

doi:10.1007/s11771-019-4043-5

Cited by 12 publications

(8 citation statements)

References 30 publications

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“…On the one hand, after coupled loading, a descriptive analysis of the rock damage evolution process is performed by determining the properties such as failure strength, residual strength, cumulative plastic strain, and so on (Cai et al, 2020;Jin et al, 2014;Ma et al, 2004;Wang et al, 2010Wang et al, , 2013. However, when the initial stress of rocks is close to the instability strength (in the vicinity of the strength limit), a small disturbance not exceeding the peak value can also cause instability (Tang et al, 2014), and the strength-based criteria may become invalid. On the other hand, the instability process of rocks can be described by defining energy-related damage variables (Li et al, 2020;Yang et al, 2021), but most of the existing studies only define damage deterioration of rock materials by roughly analyzing the evolution law of dissipated energy, which also cannot reveal the energy conversion relationship in the vicinity of strength limit accurately.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on the irreversible displacement evolution and energy dissipation characteristics of disturbance instability of regular joints

Yang

Fan

Wang

et al. 2023

Deep Underground Science and Engineering

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To investigate the disturbance‐induced shear instability mechanism of structural catastrophe in the deep rock mass, MTS 815 material testing machine was used to carry out quasi‐static loading tests and disturbance shear tests on symmetrical regular dentate joints of two materials at three undulation angles under specific initial static stress, disturbance frequency, and peak value. The test results indicate that: (i) the total ultimate instability displacement is only related to the intrinsic properties of the joints but not to the initial static stress and disturbance parameters; (ii) the cumulative irreversible displacement required for the disturbance instability conforms to the logistic inverse function relationship with the number of disturbances, displaying the variation trend of “rapid increase in the front, stable in the middle, and sudden increase in the rear”; (iii) the accumulation of plastic deformation energy is consistent with the evolution law of irreversible displacement of joints and the overall proportion of hysteretic energy is not large; (iv) the dissipated energy required for the instability of each group of joints is basically the same under various disturbance conditions, and this energy is mainly controlled by the initial shear stress and has no connection with the disturbance parameters. The stability of the total disturbance deformation and the disturbance energy law of the joints revealed in the tests provide data support for reasonably determining the disturbance instability criterion of joints.

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Section: Introductionmentioning

confidence: 99%

Experimental study on the irreversible displacement evolution and energy dissipation characteristics of disturbance instability of regular joints

Yang

Fan

Wang

et al. 2023

Deep Underground Science and Engineering

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“…Yin et al employed the strain model of soft clay to describe the permanent strain of the GRS under different water content and confining pressure and analyzed the relationship between fitting parameters and confining pressure, load amplitude, water content, and other variables [8]. Tang et al proposed a nonlinear creep model of GRS, which considers the accumulation of residual stress under the dynamic loading of subgrade combined with rheological theory and the creep behavior of GRS [24]. This model can better predict the creep characteristics of GRS under cyclic dynamic loading, but it is not well applied to more complicated situations, such as D-W cycles.…”

Section: Introductionmentioning

confidence: 99%

An Experimental Study with Model Calibration for the Permanent Strain of Granite Residual Soil Subgrade under Drying-Wetting Cycles

et al. 2023

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The permanent strain is one of the most important dynamic properties of the granite residual soil. To systematically study the dynamic deformation characteristics of granite residual soil (GRS) under the drying-wetting (D-W) cycles, a series of dynamic triaxial tests is carried out to obtain the stress-strain relationship of GRS with various fine particle contents subjected to D-W cycles. The experimental results show that the growth of permanent strain consists of two stages, namely, compaction stage and compression stage. The main effect of D-W cycles is reflected in the compression stage. On the other hand, the influence of fine particle contents on the permanent strain occurs mainly at the compaction stage, which can be classified as the lubrication, densification, and asphyxiation, respectively. Subsequently, a new criterion to characterize the permanent strain of GRS is deduced from the experimental results, which accounts for both strains and rates of strains. This criterion illustrates that with the increase of D-W cycles number, the permanent strain evaluation pattern of GRS is gradually changing from plastic stabilization to plastic creep. Finally, a quadratic function model referring to the log-log scale is proposed to fit well the relationship between the permanent strain and loading cycle number of GRS under D-W cycles. It is found that the parameters of the proposed model can physically represent the strain rate, the compression strain, and the compaction strain.

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“…They observed that the stress-drop and strain increase in the tests were related to the residual strain caused by dynamic disturbance. Tang et al (2014) changed the average stress and the amplitude of disturbance load to explore the mechanical properties of marble under cyclic dynamic disturbance and high stress state.…”

Section: Introductionmentioning

confidence: 99%

Mechanical model establishment and energy characteristics analysis for rock material considering the dynamic disturbance effect

Feng

Wang

et al. 2023

Preprint

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An element mechanical assembly model was established with the combined modeling method to study the dynamic damage behaviors of deep rock. In this model, the effect of disturbance and pre-static loading on the rock mechanics and statistical parameters was considered and a modified function was introduced to deduce the damage evolution function, thus a mechanical model of rock was established. This model was verified against the relevant experimental and bibliographic data. The results show that the damage evolution rate curve gradually moves to the right along the strain axis and the peak value of curve decreases first and then increases with increasing parameter k. When k is large, the damage evolution rate appears a “plateau” which is more obvious as k gets higher. This “plateau” may correspond to the damage stable development stage. Further, the pre-static loading can improve the resistance to impact of rock. The released energy of rock in the rebound under pre-static loading is higher than that under no pre-static loading with the constant disturbance frequency. It decreases with disturbance numbers rising as the pre-static loading remains unchanged, which indicates the resistance to impact of rock is weakened by adding disturbance frequency. These predictions were consistent with test data in pre-peak stage of “rebound” type curve. For strain-softening type curves, this model did not only fit preferably with test data in the pre-peak stage but also had high fitting accuracy in the post-peak stage. This model can well characterize the mechanical properties and stress-strain behaviors of rock under the combination of static loading and frequent disturbance. These results can provide certain references for the evaluation of the safety and stability of deep rock engineering under high ground stress and frequent dynamic disturbance.

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Dynamic stress accumulation model of granite residual soil under cyclic loading based on small-size creep tests

Cited by 12 publications

References 30 publications

Experimental study on the irreversible displacement evolution and energy dissipation characteristics of disturbance instability of regular joints

Experimental study on the irreversible displacement evolution and energy dissipation characteristics of disturbance instability of regular joints

An Experimental Study with Model Calibration for the Permanent Strain of Granite Residual Soil Subgrade under Drying-Wetting Cycles

Mechanical model establishment and energy characteristics analysis for rock material considering the dynamic disturbance effect

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