Experimental investigation of fractal dimension effect on deformation modulus of an artificial bimrock

Mahdevari, Saeed; Moarefvand, Parviz

doi:10.1007/s10064-017-1074-8

Cited by 18 publications

(5 citation statements)

References 28 publications

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“…Scholars at home and abroad have done a lot of research on the mechanism of rib spalling. MahdevariandMoarefvand proposed that the hardness of coal was the biggest infuencing factor on rib spalling [22][23][24]. Zhao et al proposed that under the infuence of self-weight and roof pressure, the coal wall was mainly in the form of tension failure and shear failure, and a method to determine the support working resistance based on the control of the roof and coal wall was given [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Study on Dynamic Evolution of Overburden Rock Movement and Mining-Induced Stress of Ultra-high Working Face

Zheng

Sun

2022

Shock and Vibration

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In order to explore the dynamic evolution of overburden rock movement and mining-induced stress of an ultra-high working face, taking the ultra-high working face of a 2# thick coal seam in a shallow mine field as the engineering background, this paper analyzes the distribution characteristics of principal stress, mining stress evolution characteristics, overburden rock migration characteristics, and overburden rock caving characteristics of a shallow overburden rock ultra-high working face under different advancing distances and calculates by FLAC3D numerical simulation software. The results show that when the working face advances to 200 m, the stress concentration degree presents a stable trend. The concentration degree and variation gradient of the maximum principal stress are greater than those of the minimum principal stress, while the range of the peak ahead coal wall is smaller than that of the minimum principal stress peak leading coal wall. With the increase of the advancing range, the stress recovery degree gradually increases, and the maximum principal stress recovery degree is higher than the minimum principal stress. When the working face advances to 300 m, the maximum principal stress restores to 66% of the initial value, while the minimum principal stress is only restored to about 50%, and the surface subsidence degree reaches 2.5 m.

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Section: Introductionmentioning

confidence: 99%

Study on Dynamic Evolution of Overburden Rock Movement and Mining-Induced Stress of Ultra-high Working Face

Zheng

Sun

2022

Shock and Vibration

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“…This is because acoustic wave velocities are not only related to VBP but also sensitive to block shape, size distribution, and the strength ratio of block bodies to the matrix. Mahdevari and Maarefvand conducted transverse and longitudinal wave tests on physically prepared samples and found that, for isotropic Bimrock with blocks, both transverse and longitudinal wave velocities increase with increasing VBP [ 76 ]. The estimated uncertainty depends on the maximum block size and fractal dimension.…”

Section: Research On the Measurement Methods And Uncertainty Of Geome...mentioning

confidence: 99%

“…If introducing the block number Bc and the line roughness fractal dimension D , a combined parameter

it is found that elastic modulus and

have a good correlation. Mahdevari and Maarefvand [ 76 ] found through reshaping specimens that, with the increase in VBP and the decrease in fractal dimension, the deformation modulus of Bimrock increases. The high correlation factor multivariate regression analysis shows that there is an indirect relationship between the deformation modulus and the fractal dimension and a direct relationship with the maximum block size and VBP.…”

Section: Analysis Of Factors Influencing the Mechanical Properties Of...mentioning

confidence: 99%

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Research Progress on the Geomechanical Properties of Block-in-Matrix Rocks

Guo,

Wei,

et al. 2024

Materials

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The differences in geomechanical properties and the uncertainty in the spatial distribution of Bimrock pose significant challenges to the construction and disaster prediction of geotechnical engineering. To clarify the geomechanical characteristics of Bimrock, this paper summarizes the basic concepts and classification methods of Bimrock at home and abroad. It discusses the methods and characteristics of determining the geometric features of Bimrock blocks and explores the influencing factors and laws of failure modes and strength under different stress states of Bimrock. The study finds that the failure mode of Bimrock is mainly influenced by factors such as block proportion, degree of welding between blocks and matrix, strength ratio between blocks and matrix, and geometric properties of blocks. Among these factors, block proportion is the most significant, and the degree of welding is a controlling factor. However, due to the complexity of Bimrock structures, there is a lack of applicable methods and mechanical models for the evaluation of geomechanical characteristics of Bimrock in engineering practice. This article also explores the influence and research methods of the geological characteristics of Bimrock in slope and tunnel engineering and, finally, provides prospects for the future research trends relating to Bimrock.

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“…Sonmez et al [14] investigated the influence of block content on the mechanical parameters of welded bimrock mass. Mahdevari and Moarefvand [15] reported that the deformation modulus of remolded bimrock samples increased with the volumetric block proportion (VBP) increment and fractal dimension reduction. Wang et al [16] summarized an approximate quadratic polynomial relationship between the uniaxial compression strength, elastic modulus and VBP, and a linear piecewise relationship for the internal friction angle, cohesion and VBP.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Volumetric Block Proportion (VBP) Effect on Excavation-Induced Ground Response of Talus-like Rock Mass Based on DEM Simulations

Wang

et al. 2022

Materials

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Due to the complexity of the talus-like rock mass with different values of volumetric block proportion (VPB), it is thus crucial to explore the VBP effect on the excavation-induced ground responses. We conduct a series of 2D DEM (discrete element method) simulations on a common circular tunnel excavation in the talus-like rock mass with different VBPs (0%, 15%, 50%, 85% and 100%). For each VBP, two support scenarios, i.e., unsupported and supported by a rigid lining, are considered. The micro characteristics of the excavation-induced ground responses, including the contact force, force chain, coordination number and shear-slip contact, and the stress distribution and ground settlement are elaborated in detail. Accordingly, three types of talus-like rock masses are identified as soil-, hybrid- and rock-types, corresponding to VBP = 0–15%, 50%, and 85–100%, respectively. It is found that the lining support is essential for maintaining the ground stability of a tunnel excavation in the soil- and hybrid-type talus-like rock masses while the backbones formed by rock blocks in the rock-type talus-like rock mass can provide a certain support for the surrounding ground. Our findings have important implications for optimizing the construction scheme of tunnel excavation in different types of talus-like rock masses.

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Experimental investigation of fractal dimension effect on deformation modulus of an artificial bimrock

Cited by 18 publications

References 28 publications

Study on Dynamic Evolution of Overburden Rock Movement and Mining-Induced Stress of Ultra-high Working Face

Study on Dynamic Evolution of Overburden Rock Movement and Mining-Induced Stress of Ultra-high Working Face

Research Progress on the Geomechanical Properties of Block-in-Matrix Rocks

Investigation of Volumetric Block Proportion (VBP) Effect on Excavation-Induced Ground Response of Talus-like Rock Mass Based on DEM Simulations

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