Investigation on the Creep Failure Mechanism of Sandy Mudstone Based on Micromesoscopic Mechanics

Shi, Xinshuai; Jing, Hongwen; Chen, Weiqiang; Gao, Yuan; Zhao, Zhenlong

doi:10.1155/2021/5550733

Cited by 15 publications

(3 citation statements)

References 34 publications

(37 reference statements)

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“…Rock is a complex mineral collection with its own particular internal material composition and spatial structure 27 . The fracture extension direction, fine fracture characteristics, and the relative displacement direction of rock masses on both sides of the section were judged by the morphological characteristics of different fractures 28 . By comparing the fracture morphology and fracture extension of creep specimens of peak-unloading damaged white sandstone, the creep damage mechanism of peak-unloading damaged white sandstone is analyzed.…”

Section: Discussionmentioning

confidence: 99%

Experimental study on uniaxial creep characteristics of sandstone with pre-peak unloading damage

Liang

Zhang

et al. 2022

Sci Rep

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Deep resource extraction has been affected by the complex geological environment of "three highs and one disturbance" for a long time. The surrounding rocks experience strong unloading stress disturbance during the underground resource extraction. The creep characteristics of the perimeter rocks are of great theoretical and practical value. Firstly, the triaxial pre-peak loading and unloading tests on the prepared samples are conducted on the intact rock samples using the TAW-200 rock mechanics test system. Then the rock samples with different degrees of pre-peak unloading damage were prepared under the condition of pre-peak yield. Finally, the uniaxial creep tests were carried out to study the uniaxial creep mechanical properties. The results show that the wave velocities of the damaged rock samples are reduced to different degrees compared with those of the intact rock samples, the creep of the pre-peak unloading damaged rock has a time-dependent damage effect, and the study results are similar to those of the conventional uniaxial creep test of the white sandstone. The instantaneous strain at all stress levels of the damaged rock samples increased gradually with the stress level, which is consistent with the non-linear functional relationship; Based on the time-dependent damage effect, the two-parameter Weibull distribution function was introduced into the West Plains viscoelasticity model, and a creep damage model for white sandstone was proposed. The improved Nishihara model can simulate the uniaxial creep characteristics of each damaged rock sample at various stress levels.

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Section: Discussionmentioning

confidence: 99%

Experimental study on uniaxial creep characteristics of sandstone with pre-peak unloading damage

Liang

Zhang

et al. 2022

Sci Rep

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“…Roof cutting and pressure release without coal column mining technology refer to pre-cutting the roof plate on the side of the backwind lane of the working face to a certain distance in advance, so that the overlying rock layer in the mining area collapses under the action of the mine pressure according to the cuts and forms the roadway gang [21][22][23]. Additionally, by implementing blasting pre-cracking through the top plate, the association between the roof plate of the roadway and the overlying rock layer of the mining area is cut off to realize the transformation from a long-armed beam structure to a short-armed beam structure, which enhances the stability of the structure and fundamentally changes the stress distribution law of the surrounding rock along the empty roadway under the influence of mining motion [24,25]. In the process of automatic formation caused by roof cutting and pressure release, adjusting the roof structure will lead to a large amount of deformation, and the surrounding rock of the roadway will yield or even result in plastic flow, as the coal body is far from the free surface when it is still in its elastic state [26,27].…”

Section: Analysis Of Roadway Stability Of Top-cutting and Pressure-re...mentioning

confidence: 99%

Study on a High-Efficiency Mining Technology System for Gas Outburst in Coal Seams—Example of an H Coal Mine

et al. 2022

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Coal will continue to play an important role in China’s economic development and social development in the coming decades. However, due to the complex distribution conditions of coal resources, the mining of coal resources is subject to various restrictions. Coal and gas outburst is an important issue in coal mining, and the threat to the mining of coal resources caused by high gas outburst activity has been receiving more attention. In order to solve the problems related to safe and efficient mining under coal seams with gas outburst, such as mining difficulties, large amounts of work, resource waste, no guaranteed gas treatment time, and low economic efficiency, it is necessary to innovate mining technology and methods for managing gas outburst in coal seams to improve the efficiency of coal mines and to solve the above problems. This study proposes a green mining technical method system known as the “L-H method”, which is applicable to the safe and efficient mining of coal seams with gas outburst based on combined theoretical analysis and numerical simulation. The following research results are achieved: (1) The “L-H method” is proposed, and a mining area model of coal seams with gas outburst is established. The specific details of the method and the implementation process are introduced. (2) Examples of H coal mine applications are presented, and the effects of the implementation of the “L-H method” are analyzed and summarized through mine pressure observations from roadways, and it is concluded that the implementation of top-cutting and pressure-relief technology has a good control effect on the roadway-surrounding rock and that gas extraction reaches the national standard of less than 8 m3/t for protrusion prevention; this ensures safety and also achieves efficient mining. This study will provide a good reference for the implementation of green mining methods to similar coal and gas outburst mines.

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“…Rock is a complex mineral arrogate with its own particular internal material composition and spatial structure 27 . The fracture extension direction, fine fracture characteristics, and the relative displacement direction of rock masses on both sides of the section were judged by the morphological characteristics of different fractures 28 . By comparing the fracture morphology and fracture extension of creep specimens of peak-unloading damaged white sandstone, the creep damage mechanism of peak-unloading damaged white sandstone is analyzed.…”

Section: Failure and Deterioration Mechanism Of White Sandstonementioning

confidence: 99%

Experimental study on uniaxial creep characteristics of sandstone with pre-peak unloading damage

Liang

Zhang

et al. 2022

Preprint

View full text Add to dashboard Cite

Deep resource extraction is subjected to the complex geological environment of "three highs and one disturbance" for a long time. The surrounding rocks experience strong unloading stress disturbance during the underground resource extraction. The creep characteristics of the perimeter rocks are of great theoretical and practical value. Firstly, the triaxial pre-peak loading and unloading tests on the prepared samples are conducted on the intact rock samples using the TAW-200 rock mechanics test system. Then the rock samples with different degrees of pre-peak unloading damage are prepared under the condition of pre-peak yield. Then uniaxial creep tests were carried out to study the uniaxial creep mechanical properties. The results show that the wave velocities of the damaged rock samples are reduced to different degrees compared with those of the intact rock samples; The creep of the pre-peak unloading damaged rock has a time-dependent damage effect, and the study results are similar to those of the conventional uniaxial creep test of the white sandstone. The instantaneous strain at all stress levels of the damaged rock samples increased gradually with the stress level, and all conformed to the non-linear functional relationship; based on the time-dependent damage effect. The two-parameter Weibull distribution function was introduced into the West Plains viscoelasticity model, and a creep damage model for white sandstone was proposed. The improved Nishihara model can simulate the uniaxial creep characteristics of each damaged rock sample at various stress levels.

show abstract

Investigation on the Creep Failure Mechanism of Sandy Mudstone Based on Micromesoscopic Mechanics

Cited by 15 publications

References 34 publications

Experimental study on uniaxial creep characteristics of sandstone with pre-peak unloading damage

Experimental study on uniaxial creep characteristics of sandstone with pre-peak unloading damage

Study on a High-Efficiency Mining Technology System for Gas Outburst in Coal Seams—Example of an H Coal Mine

Experimental study on uniaxial creep characteristics of sandstone with pre-peak unloading damage

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