Influence Research for Softening and Swelling of Weakly Cemented Soft Rock on the Stability of Surrounding Rock in Roadway

Li, Yan; Ma, Chao; Zhang, Lianying; Li, Bing

doi:10.1155/2022/6439277

Cited by 10 publications

(10 citation statements)

References 8 publications

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“…Formula ( 13) describes the critical failure stress state of rock based on the M-C criterion model. When the rock sample is under uniaxial compression, the parameter k � k 0 , according to formula (13):…”

Section: Critical Failure Energy Functionmentioning

confidence: 99%

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Mechanical Properties of Sandstones after Freeze‐Thaw Cycles and Models for Their Strength Prediction

Jin

et al. 2022

Advances in Civil Engineering

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In cold regions, rock’s load-bearing capacity will be greatly diminished in severe settings. This research investigates the influence of freezing and thawing on the physical and mechanical characteristics of sandstone, as well as the strength under complicated stress conditions. Uniaxial compression of sandstone samples was performed following freeze-thaw cycles, and the changes in elastic modulus and peak stress of dry sandstone and saturated sandstone were investigated under various freeze-thaw cycles. ANOVA was used to analyze whether there were significant differences between the number of freeze-thaw cycles and the peak strength and elastic modulus. A three-parameter strength prediction model based on σC, k0, and m is created based on the critical failure energy function. Experimental data is utilized to assess the model’s correctness, and the model is used to forecast the strength of dry and saturated sandstone during freeze-thaw cycles. The result indicates that peak stress and elastic modulus of dry and saturated sandstone show a steady attenuation pattern as the number of freeze-thaw cycles increases. Brittle failure is the failure mode of dry sandstone, whereas brittle failure to plastic failure is the failure mode of saturated sandstone. After 60 freeze-thaw cycles, peak stress in dry and saturated sandstone was reduced by 55.3% and 56.8%, respectively. The three-parameter model can predict the triaxial compressive strength of specimens under different confining pressures through the uniaxial compressive strength of specimens with an error range of 1% to 13%.

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Section: Critical Failure Energy Functionmentioning

confidence: 99%

“…When the water in the pores of the rock turns from liquid to solid, the volume expands by 9%, and the constant migration of water molecules causes the rock damage to worsen, which may cause slope instability [11][12][13][14]. Fan [15] investigated the features of stress variations over time in a F-T cycle sandstone loading experiment.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Sandstones after Freeze‐Thaw Cycles and Models for Their Strength Prediction

Jin

et al. 2022

Advances in Civil Engineering

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“…This inevitably leads to a large number of original defects and damage randomly distributed within the concrete. [12][13][14] These defects inevitably affect the mechanical properties of the concrete and the safety of the structure. Under long-term loading, the internal defects gradually develop through and form external cracks.…”

Section: Introductionmentioning

confidence: 99%

Influence of pore water pressure on concrete creep and a creep model considering the effect of cohesion and internal friction angle

Liu,

Zhang

2024

Fatigue Fract Eng Mat Struct

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A new nonlinear viscoplastic body considering cohesion and internal friction coefficient versus time is proposed by considering cohesion and internal friction angle. A new creep model for concrete considering cohesion and internal friction angle is obtained by interlocking it with the conventional model. The results show that the creep model can properly reflect the creep development of soft‐cut concrete at the pile head by comparing the creep model with the three‐dimensional creep test data trends under various levels of loading. The model can well describe the whole process of creep deformation and also better compensate for the shortcomings of the traditional creep model that cannot describe the characteristics of accelerated creep deformation.

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“…The weakly cemented soft rocks of the Triassic, Cretaceous, and Jurassic periods are widely distributed in Xinjiang, Gansu, Ningxia, and Western Inner Mongolia in the western regions of China [1][2][3]. Due to their low strength and easy weathering, they are easily softened and prone to disintegration after excavation and encountering water.…”

Section: Introductionmentioning

confidence: 99%

Study on the Influence of Roadway Structural Morphology on the Mechanical Properties of Weakly Cemented Soft Rock Roadways

Liu

Duan

et al. 2023

Sustainability

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We used the 11,303 return air roadway of the Hongqingliang coal mine as the engineering background for a study exploring the impact of the structural morphology of the roadway on the stress distribution characteristics and the stability of a weakly cemented soft-rock mine roadway. This work studies the evolution law of stress and deformation, and the plastic zone of weakly cemented soft-rock roadways with retaining the top or bottom coal seams. The results show that when retaining the top coal is replaced by the bottom coal, the high-stress zone of the vertical stress is reduced, the peak stress is decreased, and the stress concentration coefficient is slightly reduced from 1.67 to 1.64. The peak value of the vertical displacement of the roof of the shaft which was 78.4% of that of the top coal also decreases significantly, while the peak value of the vertical displacement of the floor, which was 1.37 times that of the top coal, increases. The equal area method was used to change the aspect ratio of the roadway. When the aspect ratio decreased from 1.38 to 0.88, the high-stress zone of the vertical stress was reduced, the stress peak decreased, and the stress concentration coefficient decreased from 1.8 to 1.75. The vertical displacement of the roof increased by 27.7% from 10.91 mm to 13.93 mm, and the vertical displacement of the floor increased by 15.2% from 6.60 mm to 7.60 mm. The plastic failure range was significantly reduced, particularly at the bottom corners. These findings show that structural morphology has a great influence on the floor heave of weakly cemented soft rock. Reasonable retention of the top or bottom coal and the aspect ratio of the roadway can prevent the deformation and failure of the roadway in weakly cemented soft rock.

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Influence Research for Softening and Swelling of Weakly Cemented Soft Rock on the Stability of Surrounding Rock in Roadway

Cited by 10 publications

References 8 publications

Mechanical Properties of Sandstones after Freeze‐Thaw Cycles and Models for Their Strength Prediction

Mechanical Properties of Sandstones after Freeze‐Thaw Cycles and Models for Their Strength Prediction

Influence of pore water pressure on concrete creep and a creep model considering the effect of cohesion and internal friction angle

Study on the Influence of Roadway Structural Morphology on the Mechanical Properties of Weakly Cemented Soft Rock Roadways

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