Effect of water saturation on dynamic behavior of sandstone after wetting-drying cycles

Li, Hongru; Qiao, Yafei; He, Manchao; Shen, Rongxi; Gu, Zhoujie; Cheng, Tai Hong; Xiao, Yingming; Tang, Jie

doi:10.1016/j.enggeo.2023.107105

Cited by 50 publications

(10 citation statements)

References 44 publications

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“…Protected coal seams, roof, and foor are simplifed into a TS-RCR structure. When both rocks and coal are at the linear elastic stage, the equivalent elastic modulus E of the parts of rocks and coal in series can be calculated as follows [28][29][30][31][32][33]:…”

Section: Mechanical Model Of the Ts-rcr Structural Bodymentioning

confidence: 99%

“…where σ j is the stress acting on the TS-RCR structural body and ε j is the strain generated by the TS-RCR structural body. Equations ( 2) and ( 3) are combined to obtain the following equation [28][29][30][31][32][33]:…”

Section: Mechanical Model Of the Ts-rcr Structural Bodymentioning

confidence: 99%

“…Strain produced under the same stress (σ 0 � σ m � σ j � σ y ) is ε m , ε j , and ε y (Figure 3), respectively, after the stress of coal, the TS-RCR structural body, and rocks is redistributed. Te equilibrium principle of elastic mechanics is used to obtain the following [28][29][30][31][32][33]:…”

Section: Mechanical Model Of the Ts-rcr Structural Bodymentioning

confidence: 99%

“…Strain ε j produced on the TS-RCR structural body is compared with strain ε m produced on the coal mass under the same stress (σ 0 � σ m � σ j � σ y ) to obtain the following equation [28][29][30][31][32][33]:…”

Section: Mechanical Model Of the Ts-rcr Structural Bodymentioning

confidence: 99%

“…Stress σ j acting on the TS-RCR structural body is compared with stress σ y acting on the coal mass are compared to obtain the following equation [28][29][30][31][32][33]:…”

Section: Mechanical Model Of the Ts-rcr Structural Bodymentioning

confidence: 99%

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Experimental Study on the Damage and Crack Evolution Characteristics of TS-RCR Structural Bodies under Cyclic Loading and Unloading

Xie,

Chen,

Fang

et al. 2023

Advances in Civil Engineering

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Four representative TS-RCR (three-soft rock-coal-rock) structural bodies were selected according to the lithofacies analysis of coal measures in the Xiangshui Coal Mine, Guizhou, China, to analyze the mechanical properties, internal structure damage characteristics, and crack evolution law of the TS-RCR structural body composed of a soft roof, a soft floor, and soft coal seams. The mechanical model of the TS-RCR structural body was proposed. (1) The stress-strain curves of TS-RCR structures with different lithologies under cyclic loading and unloading show a change rule of sparsity, density, and sparsity with the increased cycles. The deformation of TS-RCR structures under cyclic loading and unloading can be divided into four stages. When the height ratio of the TS-RCR structural body was the same, the higher the strength of the upper and lower rocks, the more cycles the TS-RCR structural body had, and the denser the cyclic loading and unloading curve. On the contrary, the fewer cycles the TS-RCR structural body had, the sparser the cyclic loading and unloading curve. (2) The T2 (transverse relaxation time) spectrum curves of the structural bodies were monitored at about 1 and 10 ms, and two obvious peaks were detected, indicating micropores and mesopores with a large volume in the structural body. Signal intensity increased at the relaxation time of 1 ms, decreased at 10–100 ms, and increased slightly at 100–1000 ms. The pore structure of the structural body with different lithologies changed significantly with the increased cycle number. (3) The damage and failure process of the structural body was roughly divided into three periods according to the time-history analysis of acoustic-emission AF (the ratio of acoustic-emission ringing count to duration) of the structural body: the active period with a relatively low AF value (AF < 60 kHz) in the 1st-2nd cycles; the rising period with a relatively stable increase of the AF value in the 3rd-4th cycles; and the explosive period with a relatively high AF value (AF ≥ 60 kHz) in the 5th cycles. According to the relationship between the RA (the ratio of the rise time to the amplitude of the acoustic-emission-detection wave) value and time, the evolution law of the RA value and AF value of structures with different lithologies is similar in different periods under cyclic loading and unloading.

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Section: Mechanical Model Of the Ts-rcr Structural Bodymentioning

confidence: 99%

Section: Mechanical Model Of the Ts-rcr Structural Bodymentioning

confidence: 99%

Section: Mechanical Model Of the Ts-rcr Structural Bodymentioning

confidence: 99%

Section: Mechanical Model Of the Ts-rcr Structural Bodymentioning

confidence: 99%

“…Stress σ j acting on the TS-RCR structural body is compared with stress σ y acting on the coal mass are compared to obtain the following equation [28][29][30][31][32][33]:…”

Section: Mechanical Model Of the Ts-rcr Structural Bodymentioning

confidence: 99%

See 3 more Smart Citations

Experimental Study on the Damage and Crack Evolution Characteristics of TS-RCR Structural Bodies under Cyclic Loading and Unloading

Xie,

Chen,

Fang

et al. 2023

Advances in Civil Engineering

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Bibliometric analysis of research challenges and trends in urban underground space

Zhang,

Zheng,

et al. 2024

Deep Underground Science and Engineering

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The utilization and development of urban underground space play a crucial role in optimizing the layout of civic architecture and enhancing the urban ecological environment, which contributes toward increasing the overall carrying capacity and promoting sustainable development in megacities. To delve into the research progress of urban underground space, knowledge maps were created using the information visualization software VOSviewer. The literature was systematically extracted from three prominent databases, namely, Web of Science, Scopus, and China National Knowledge Infrastructure. According to the bibliometric analysis of the co‐citation and core words co‐occurrence, the trends and challenges of research on urban underground space were identified. As highlighted by the results obtained, it still remains highly challenging to achieve interdisciplinary collaboration in urban underground space research; the research trends of urban underground space consist of collaborative planning and whole life cycle sustainable development, multisource geological data informatization and resource evaluation, infrastructure design optimization, and intelligent construction. The knowledge map, drawn using bibliometric methods, offers a quantitative analysis of literature retrieval across various levels. It is recognized as an essential tool for exploring and identifying challenges and trends in urban underground space.

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Strain Rate Effect of Siltstone Under Triaxial Compression and Its Interpretation from Damage Mechanics

Xiao,

Qiao,

et al. 2023

Rock Mech Rock Eng

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Effect of water saturation on dynamic behavior of sandstone after wetting-drying cycles

Cited by 50 publications

References 44 publications

Experimental Study on the Damage and Crack Evolution Characteristics of TS-RCR Structural Bodies under Cyclic Loading and Unloading

Experimental Study on the Damage and Crack Evolution Characteristics of TS-RCR Structural Bodies under Cyclic Loading and Unloading

Bibliometric analysis of research challenges and trends in urban underground space

Strain Rate Effect of Siltstone Under Triaxial Compression and Its Interpretation from Damage Mechanics

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