Experimental Investigation on Weakening of Discontinuities at the Interface Between Different Rock Types Induced by Wetting and Drying Cycles

Wu, Qiong; Meng, Zhen; Tang, Huiming; Wang, Xiaohan; Huang, Lei; Kang, Jintao; Liu, Yuxin; Wang, Di; Huo, Xiaoxue

doi:10.1007/s00603-021-02731-5

Cited by 16 publications

(2 citation statements)

References 66 publications

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“…Noteworthy, the CIS and the CDS are regarded as the lower limit and the upper limit of the long-term strength, respectively. Therefore, the accurate evaluation of the CIS is very beneficial to revealing the progressive failure mechanism of the rock and structuring rock strength criterion [29]. Additionally, the determination of the CDS is also significant in analyzing the long-term stability of rock slopes.…”

Section: Analysis Of Characteristic Stressesmentioning

confidence: 99%

Damage Evolution and Failure Mechanism of Red-Bed Rock under Drying–Wetting Cycles

Wen

Wang

Tang

et al. 2023

Water

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The rock mass on the bank slope of the Three Gorges Reservoir (TGR) area often suffers from a drying–wetting cycle (DWC). How the DWCs significantly affect the mechanical properties and the stability of the rock mass is worth comprehensively investigating. In this study, the influence of the DWC on the mechanical properties of red-bed rock, mainly purplish red argillaceous siltstone, is explored in detail. Triaxial compression tests were conducted on siltstones that were initially subjected to different DWCs. The results show that DWCs lead to a decrease in mechanical properties such as peak stress, residual stress, and elastic modulus, while an increase in confining pressure (CP) levels leads to an increase in these mechanical properties. Significant correlations are found between the energy parameters and the DWC or the CP. Notably, the total absorption energy (TAE) demonstrates a positive correlation with the CP, but the capability of siltstones to absorb energy shows a negative correlation with DWC. Moreover, the study also examines the damage evolution laws of rocks under different DWCs by proposing a damage variable (DV). Results demonstrate that the effect of the CP on the DV is more pronounced than that of DWCs. A novel brittleness index (BI) was also proposed for estimating rock brittleness through damage strain rate analysis. The effectiveness of the proposed BI is validated by evaluating the effects of DWCs and CP on rock brittleness. Finally, the failure mechanism of the rocks under water–rock interaction is revealed. The weakening of mechanical properties occurs due to the formation of microcracks in response to DWCs. These findings provide valuable guidance for the long-term stability assessment of bank slope engineering projects under DWCs.

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Section: Analysis Of Characteristic Stressesmentioning

confidence: 99%

Damage Evolution and Failure Mechanism of Red-Bed Rock under Drying–Wetting Cycles

Wen

Wang

Tang

et al. 2023

Water

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“…The wetting-drying cycle refers to the process in which the rock mass is continuously subjected to repeated cycles of soaking, dewatering, soaking, and dewatering under rainfall or groundwater conditions [12][13][14][15][16][17][18][19]. In this process, the physical and mechanical parameters of the rock mass are continuously weakened, the strength is continuously reduced, and the creep aging effect is continuously intensified [20][21][22][23][24][25][26], with the increase of time, under certain conditions, it may even cause accidents such as engineering instability and failure.…”

Section: Introductionmentioning

confidence: 99%

Study on creep mechanical properties of carbonaceous shale under dry-wet cycle

Wei¹,

et al. 2023

Phys. Scr.

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The creep mechanical properties of rock under dry-wet cycles are of great significance for studying the long-term aging stability of engineering rock and soil. In the past, there were few studies in this area, and most of the dry-wet cycle tests on rock samples did not conform to the actual stress state of the rock. In view of the shortcomings of these studies, this paper innovatively carried out the dry-wet cycle test of the rock under the continuous state of the stress field, and studied its mechanical properties. The specific method is to take carbonaceous shale as the research object, and use the soft rock shear rheological test system independently developed by our research group to carry out the shear creep test of carbonaceous shale under the action of dry-wet cycle. The test results show that the creep full-time curves of carbonaceous shale under different dry-wet cycles show a step-shaped curve shape. The dry-wet cycle has a significant effect on the deformation characteristics of carbonaceous shale. With the increase of the number of dry-wet cycles, the instantaneous strain of the rock gradually increases, the instantaneous shear modulus decreases from 596.650 MPa at 0 times to 365.199 MPa at 12 times, and the attenuation rate reaches 38.79 %. The creep strain and cumulative creep strain become larger, the stress required for accelerated creep decreases from 3.29 MPa to 2.75 MPa, and the accelerated creep time in the third stage increases from 11.892 h to 5.316 h, and the creep effect is more significant. The long-term strength of carbonaceous shale decreases from 3.05 MPa to 2.49 MPa, and the decrease increases with the increase of dry-wet cycles. The more the number of dry-wet cycles, the smaller the undulation of the shear failure section of the carbonaceous shale, and the smoother the surface. The research results have important guiding significance for the long-term aging stability analysis of engineering rock and soil mass subjected to repeated dry-wet cycles.

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Seismic behavior analysis of soft and hard interbedded rock slope considering vibration deterioration of discontinuities at the interface between different rock types in meizoseismal area—a case study

Wang

et al. 2022

Bull Eng Geol Environ

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Experimental Investigation on Weakening of Discontinuities at the Interface Between Different Rock Types Induced by Wetting and Drying Cycles

Cited by 16 publications

References 66 publications

Damage Evolution and Failure Mechanism of Red-Bed Rock under Drying–Wetting Cycles

Damage Evolution and Failure Mechanism of Red-Bed Rock under Drying–Wetting Cycles

Study on creep mechanical properties of carbonaceous shale under dry-wet cycle

Seismic behavior analysis of soft and hard interbedded rock slope considering vibration deterioration of discontinuities at the interface between different rock types in meizoseismal area—a case study

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