Effect of Wetting-Drying Cycle on the Deformation and Seepage Behaviors of Rock Masses around a Tunnel

Guo, Qingzhen; Su, Haijian; Jing, Hongwen; Zhu, Wancheng

doi:10.1155/2020/4237163

Cited by 7 publications

(5 citation statements)

References 33 publications

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“…Water-rock interaction is a problem faced in almost all tunneling projects (Guo et al 2020). A large number of studies have shown that in soft rock tunnels, long-term water-rock interactions are an important cause of tunnel damage during construction and operation, with many tunnels suffering from water softening of mudstone (Cui et al 2018).…”

Section: Surrounding Rock Deteriorationmentioning

confidence: 99%

Mechanical Properties and In-situ Stress Measurement by Rock Core Samples Drilling from a Large Section Underground Station

Zhou

Wang

et al. 2022

Preprint

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Chongqing is a mountain city in western China, with complex geological environment, which brings many difficulties to the construction of large section underground projects. The construction experience of a large number of underground projects shows that ordinary engineering geological survey is difficult to meet the requirement of engineering design and construction. Therefore, on the basis of the initial survey, intensive drilling and coring work were carried out for the engineering area of the Guobo underground station with large cross-section to be built, and the basic mechanical, softening properties of the surrounding rock and in-situ stress field of the project area are obtained by laboratory tests. Based on the present experimental results and engineering experiences, it is proposed that the potential risks of Guobo station excavation include: ①bias pressure;②High in-situ stress;③Surrounding rock deterioration. The present study has practical significance for the design and construction of Guobo underground station, and it has certain reference value for the construction of underground projects in similar geological areas.

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Section: Surrounding Rock Deteriorationmentioning

confidence: 99%

Mechanical Properties and In-situ Stress Measurement by Rock Core Samples Drilling from a Large Section Underground Station

Zhou

Wang

et al. 2022

Preprint

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“…Zhou et al 25 investigated the process and characteristics of crack initiation, extension and penetration in rocks. Guo et al 26 explored the effects of wet and dry cycles on the stability of rocks around tunnels using numerical simulation. Fu et al 27 investigated the crack extension and mechanical response of marble under three different cyclic loads by numerical simulation.…”

Section: Introductionmentioning

confidence: 99%

Investigating the impact of the quantity of wet and dry cycles on the mechanical characteristics and fracture variations of sandstones

He,

Tang,

Yin

et al. 2024

Sci Rep

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The sandstone is in a state of dry–wet cycle under the repeated action of rainfall, and its mechanical properties are deteriorated to varying degrees, which causes cracks in the sandstone. Therefore, it is of great significance to study the mechanical properties and fracture propagation of sandstone under the action of dry–wet cycles. Currently, there are limited studies using numerical simulation methods to study the fracture extension of rocks under various dry and wet cycling conditions.Therefore, in this paper, the effects of different amounts of dry and wet cycling on the mechanical properties and fracture behavior of sandstone are investigated through uniaxial compression tests and numerical simulations of fracture extension. The findings indicate that the deformation stage of sandstone remains unchanged by the dry–wet cycle. The uniaxial compressive potency and coefficient of restitution gradually diminish as the quantity of cycles rises, while the Poisson's ratio exhibits the opposite trend, and the impact on the mechanical performance of sandstone wanes with cycle increments, and the correlation coefficient surpasses 0.93, signifying a substantial influence of the dry–wet cycle on sandstone's mechanical performances. The discrepancy between the numerical simulation and experimental results is minimal, with a maximum error of only 3.1%, demonstrating the congruence of the simulation and experimental outcomes.The mesoscopic examination of the simulations indicates that the quantity of fractures in the sandstone specimens rises with the escalation of dry–wet cycles, and the steps of analysis linked to crack inception and fracture propagation are accelerated, and the analysis steps from fracture initiation to penetration are also reduced.

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“…Water-rock interaction is one of the important factors that cause the geological hazards, and the processes of deformation, destabilization, and damage of rock masses often involve water, such as rainfall leading to slope sliding [1,2], water level rise and fall causing dam base landslides [3,4], water-rich roadway and tunnel roof destabilization [5,6], and groundwater flowinduced earthquakes [7]. Water-rock interaction in coal mining can have a negative impact on engineering rock stability and constitute a severe threat to coal mine safety production.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties Damage, Fracture Evolution, and Constitutive Model of Siltstone under the Effect of Moisture Content

et al. 2022

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In order to study the weakening mechanism of mechanical properties and the evolution of fracture of water-bearing rocks, cylindrical standard siltstone samples with four moisture contents (0, 2.85, 3.87, and 4.25%) were prepared, and the mechanical properties, damage mode, AE characteristics, and fractal law of water-bearing rock samples were studied by means of uniaxial compression test and acoustic emission (AE) monitoring technique, and based on the test findings, a constitutive model of the entire process of rock deformation and damage under uniaxial compression was built with different moisture content of rock. The results show that with the increase of moisture content, the peak stress, the stress threshold of void compaction stage, and the stress threshold of elastic stage of the rock samples decreased linearly, elastic modulus decreased exponentially as a function, and the peak strain, the strain threshold of void compaction stage, and the strain threshold of elastic stage increased linearly. The higher the moisture content, the weaker the AE signal intensity and the smaller the AE count value. From dry to saturated, the damage form of rock samples gradually transitioned from predominantly tensile damage to predominantly shear damage. The fractal dimension of the broken block linearly decreases as the moisture content rises. The model constructed in this paper has good applicability to the deformation characteristics of water-bearing rocks under uniaxial compression before the peak stress; it especially can express the rock void compaction stage, but it cannot accurately describe the postpeak deformation characteristics.

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Effect of Wetting-Drying Cycle on the Deformation and Seepage Behaviors of Rock Masses around a Tunnel

Cited by 7 publications

References 33 publications

Mechanical Properties and In-situ Stress Measurement by Rock Core Samples Drilling from a Large Section Underground Station

Mechanical Properties and In-situ Stress Measurement by Rock Core Samples Drilling from a Large Section Underground Station

Investigating the impact of the quantity of wet and dry cycles on the mechanical characteristics and fracture variations of sandstones

Mechanical Properties Damage, Fracture Evolution, and Constitutive Model of Siltstone under the Effect of Moisture Content

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