Experimental Study on Mechanical Properties and Cracking Behaviors of T-Shaped Flaw-Contained Rock-like Materials Under Cyclic Loading

Cui, Lan; Liu, Yi; Sheng, Qian; Xiao, Ping

doi:10.3389/feart.2021.768077

Cited by 7 publications

(5 citation statements)

References 42 publications

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“…Under the given ground and heave mode in the figure, with increasing d, the building angle changes from clockwise to counterclockwise and then to counterclockwise. The greater the deformation of adjacent buildings caused during construction, the smaller the safety margin of buildings in subsequent links, which should be paid attention to (Cui et al, 2021). Therefore, building deformation can be predicted by observing surface heave and D value, and corresponding measures can be taken to reduce the impact of deformation.…”

Section: Analysis Of Heave and Subsidence Of Adjacent Buildingsmentioning

confidence: 99%

Analysis of the Deformation Law of Deep and Large Foundation Pits in Soft Soil Areas

et al. 2022

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Taking a deep excavation in Suzhou soft soils adopting three support schemes as the background, the excavation performance metrics, including the heave and lateral deformation of diaphragm walls, surface vertical deformation, vertical deformation of surrounding buildings, and earth pressure, are thoroughly investigated based on 15 excavation cases collected in the soft soil area of Suzhou. Based on the analysis of monitoring data, some findings were achieved: the foundation pit deformation is greatly affected by the spatial effect. The existing station can constrain the foundation pit deformation. Benefiting from the combination of various support solutions, the average maximum deflection of the diaphragm wall is 0.10% He. The maximum lateral movement depth of the diaphragm wall (δhm) is mainly located at (He-7, He+12.5). The vertical deformation of the wall top is greatly affected by the excavation exposure time and soil conditions. The heave range of the wall top is (−0.08∼0.26%) He. Under the action of the displacement of the diaphragm wall to outside the pit and the upward displacement of the wall top, the ground surface is uplifted, and the maximum uplift is (0.02∼0.14%) He, ranging from 0.12δhm to 1.13δhm. The maximum surface settlement is (−0.01% ∼ −0.15%) He, ranging from −0.22δhm to −3.11δhm. The form of building heave is mainly affected by the surface heave and the distance from the diaphragm wall (d). When d is within a certain range, there is a heave settlement difference between the adjacent side and the opposite side of the excavation, and the adjacent side undergoes mostly subsidence, while the opposite side undergoes mostly uplift. The peak value of the apparent earth pressure (AEP) envelope is 0.59γHe, which falls within (0.47∼0.78) He. The calculation scheme proposed by Kim can be used to predict the AEP for multiple soil types.

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Section: Analysis Of Heave and Subsidence Of Adjacent Buildingsmentioning

confidence: 99%

Analysis of the Deformation Law of Deep and Large Foundation Pits in Soft Soil Areas

et al. 2022

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“…Zhou et al 9 proposed a modified damage variable to analyze the correlation between the damage variable and strain rate under dynamic cyclic loading. The influence of loading rate and frequency on the mechanical properties and failure mode of T‐shaped cross fissures samples was observed under uniaxial cyclic loading compression 10 . Sun et al 11 clarified the influence of dynamic cyclic load on the hydraulic conductivity of soft clay based on seepage tests.…”

Section: Introductionmentioning

confidence: 99%

“…The influence of loading rate and frequency on the mechanical properties and failure mode of T-shaped cross fissures samples was observed under uniaxial cyclic loading compression. 10 Sun et al 11 clarified the influence of dynamic cyclic load on the hydraulic conductivity of soft clay based on seepage tests. The fatigue failure patterns of water-bearing sandstone under cyclic loading were investigated with various amplitude levels and loading frequencies based on the numerical simulation method.…”

Section: Introductionmentioning

confidence: 99%

Failure characteristic and acoustic emission spatio‐temporal evolution of coal under different cyclic loading rates

Liu

Zhao

Hua

et al. 2023

Energy Science & Engineering

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The coal and rock dynamic disasters occur more and more frequently in deep mining, which is tightly correlated to the instability of coal pillars under high stress and cyclic disturbance load. In this study, the strength, deformation behaviors, and failure mechanism of coal under cyclic loading in a high-stress state were investigated by considering the influence of cyclic loading rate. The experimental results indicate that the compressive strength is positively correlated with the cyclic loading rate, and the deformation patterns, AE amplitude, and spatial evolution are the same under various cyclic loading rates. The damage variable shows the "slow increase→fast increase→slow increase→ fast increase →slow increase→fast increase→rapid increase" trend.The damage growth rate ranges from 9.32 × 10 −5 to 4.86 × 10 −3 , and increases with the cyclic loading rate. The spatial fractal dimensions under various cyclic loading rates are the same, and the distribution ranges from 2.1 to 2.9, showing a general downward trend. The microfailure mechanism under various cyclic loading rates is mixed failure dominated by tensile failure, with a small amount of shear failure. There is a positive correlation between the percentage of shear cracks and the cyclic loading rates.

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“…In addition, these redistribution-driven surrounding rocks frequently encounter the concentration of tangential stress (σ 1 ) and then experience a spalling phenomenon with static failure distributed at a certain depth near the excavation boundary and are approximately parallel to the excavation surface (Cai, 2008;Chen et al, 2022;Feng et al, 2018;Sun et al, 2022), and even drive a rockburst phenomenon with dynamic ejection (Chen et al, 2023;Sun et al, 2022;Wang et al, 2020;Wang Q et al, 2021;Wang X R et al, 2021;Xia et al, 2022). With the increasing need for underground space and energy exploitation, the construction of deep underground engineering has been in full swing (the increasing construction depth), which leads to the two types of engineering geological hazards being more frequent and robust, seriously damaging the safety of infrastructure, equipment and workers (Cui et al, 2021;Su et al, 2020;Zhang et al, 2020;Zhao et al, 2023;Zheng et al, 2023a). However, due to the highly complex mechanisms of rock hazards (e.g., spalling and rockburst) resulting from deep underground engineering, effective prediction and warning technologies still cannot meet the prevention requirements in practical applications.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on the evolutionary characteristics of acoustic signals produced by granite under biaxial compression with different intermediate principal stresses

Lu,

Li,

Cai

2023

Front. Earth Sci.

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Biaxial compression is a typical stress state experienced by the surrounding rock near the excavation boundaries under deep underground engineering, frequently resulting in engineering geological disasters (spalling and rockburst). The motivation to mitigate the risk and damage of these disasters has led us to compressively examine the evolutionary characteristics of acoustic signals [microseismic (MS) events, sound and acoustic emission (AEs)] produced by granite under biaxial compression with different intermediate principal stresses. These characteristics include time (activeness and b value) and frequency (main frequency and proportion of the advantage frequency bands) domains. The results suggest that: 1) the signal properties-driven order of activeness under low and high intermediate principal stresses for the initial stresses were as follows: AE accounted for 37.4% and 43.5% of σpeak, MS for 61.1% and 66% of σpeak, and sound for 81.8% and 85.5% of σpeak. 2) The notable distinction in precursors of different acoustic signals before granite failure was confirmed: the sequential relationship in the continuous decrease rate of the b value (AE < MS < sound), the occurrence (only existing in AE signals) of a few signals with extremely high amplitude (the “quiescent period”) and the different frequency-change rule in the proportion of the advantage frequency bands. 3) The strong influences of intermediate principal stress on the signal precursors were determined; these precursors in the activeness, b value, and proportion are negative to intermediate principal stress, whereas that of the main frequency shows a positive correlation. Consequently, these findings can contribute integrated usage of the multifrequency signals in the prediction and warning of geological disasters under deep underground engineering.

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Experimental Study on Mechanical Properties and Cracking Behaviors of T-Shaped Flaw-Contained Rock-like Materials Under Cyclic Loading

Cited by 7 publications

References 42 publications

Analysis of the Deformation Law of Deep and Large Foundation Pits in Soft Soil Areas

Analysis of the Deformation Law of Deep and Large Foundation Pits in Soft Soil Areas

Failure characteristic and acoustic emission spatio‐temporal evolution of coal under different cyclic loading rates

Experimental study on the evolutionary characteristics of acoustic signals produced by granite under biaxial compression with different intermediate principal stresses

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