Deformation and Failure Characteristics of Soil-Rock Mixture considering Material Composition and Random Structure

Wang, Shengnian; Ji, Tingting; Xue, Qinpei; Shen, Zhifu; Zhang, Qiang

doi:10.1155/2019/3165096

Cited by 8 publications

(8 citation statements)

References 28 publications

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“…Due to a wide distribution in the nature, the SRM is one of the most commonly encountered geomaterials in tunneling, slope engineering, and dam. However, because of inhomogeneity and discontinuity between rock blocks, complex granulometric composition, and random distribution of rock blocks, these SRMs usually cause problems [3,4]. Therefore, how to define deformation and failure of the SRM is an important requirement for successful engineering designs, engineering safety assessment, and design of related engineering projects [2].…”

Section: Introductionmentioning

confidence: 99%

Analysis on Spatial Variability of SRM Based on Real-Time CT and the DIC Method Under Uniaxial Loading

Zhang

et al. 2022

Front. Phys.

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Soil and rock mixture (SRM) consists of high-strength rock blocks and small-grained soils, which depend seriously on the rock size and the heterogeneity of structure. Because of inhomogeneous cementation between rock blocks, complex granulometric composition, and random distribution of rock blocks, these SRMs usually cause problems. Investigation of the localized deformation is critical for successful engineering designs, engineering safety assessment. In this work, uniaxial compression testing on the SRM with a rock block percentage of 40% (mass ratio) is performed under real-time computed tomography (CT) combined with digital image correlation (DIC) technology. Based on radial strain fields and shear fields, heterogeneity of strain fields and rock block motion is analyzed quantitatively by semi-variance. The results show that rock block is the main factor controlling the shear band geometry distribution. A localization strain band usually occurs along the soil and rock interfaces. From the experimental results by the DIC method, the damage factor is presented to describe the damage evolution of the SRM under uniaxial compression. The method proposed in this study can be used to quantitatively analyze the deformation characteristics of the SRM sample.

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Section: Introductionmentioning

confidence: 99%

Analysis on Spatial Variability of SRM Based on Real-Time CT and the DIC Method Under Uniaxial Loading

Zhang

et al. 2022

Front. Phys.

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“…e rock with large size in soil-rock mixture and its engineering properties are between ordinary rock and soil [6,9], and its compaction characteristics and mechanical characteristics determine the safety and stability of pavement [8,9].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Effect of Compaction Work and Defect on the Strength of Soil‐Rock Mixture Subgrade

Yan¹,

Zhan²,

Hu³

et al. 2021

Advances in Materials Science and Engineering

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Soil-rock mixture is a common filling material for earth dam and subgrade. In this study, research concerned on the evolution law of engineering characteristics of soil-rock mixture under different factors and the effect of defect on subgrade strength, and geotechnical tests were carried out to analyze the influence of different factors on engineering characteristics of soil-rock mixture in the study, and the physical model was carried out to analyze the effect of different compaction works on the resilient modulus, and the influence of defect on the strength was explored by manually preset loose body. The test results showed that (1) when the soil-rock mixture was graded, P = 78, the moisture content was 14%, and the engineering characteristics were optimal; (2) there was a positive correlation between compaction times and resilient modulus, and the stress transferred from the subgrade to soil was linearly distributed under the good condition of compactness; and (3) the existence of loose body not only reduces the modulus of resilience but also affects the stress transfer; the larger the loose body, the lower the resilient modulus and the greater the stress transfer.

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“…Some achievements have been made in the study of the static and dynamic properties of soil-rock mixtures [16][17][18][19][20]. However, there are few studies on the stiffness variation rule of soil-rock mixture under the cyclic load of actual metro trains.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Stiffness Softening of Soil‐Rock Mixture Backfill under Metro Train Cyclic Load

Zhong

Zou

et al. 2021

Advances in Materials Science and Engineering

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Due to the thick soil layer, short backfill time, and low degree of consolidation of the soil-rock mixture backfill in Chongqing city, metro train tunnels passing through this type of strata are prone to large settlements during operation, which greatly affects the stability of the tunnel and the safety of metro train operations. In response to this problem, the dynamic triaxial test of the soil-rock mixture backfill under cyclic loading was carried out to study the dynamic characteristics of the soil-rock mixture backfill under cyclic loading. The effect of initial consolidation degree, effective consolidation confining pressure, and rock content on the stiffness softening of soil-rock mixture backfill was analyzed. The results show that the initial consolidation degree, effective consolidation confining pressure, and rock content are all important factors affecting the stiffness of soil-rock mixture backfill under cyclic loading. As the number of cycles increases, the lower the initial consolidation degree and effective consolidation confining pressure, the faster the attenuation of the softening index, and the larger the amplitude. As the rock content increases, the softening index increases and the stiffness of the backfill changes from softening to hardening. Based on the test data, the softening-hardening model of the soil-rock mixture is established, which is in good agreement with the field test results. This study can provide a reference for predicting and controlling the postconstruction settlement of the metro tunnel in the soil-rock mixture backfill.

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Deformation and Failure Characteristics of Soil-Rock Mixture considering Material Composition and Random Structure

Cited by 8 publications

References 28 publications

Analysis on Spatial Variability of SRM Based on Real-Time CT and the DIC Method Under Uniaxial Loading

Analysis on Spatial Variability of SRM Based on Real-Time CT and the DIC Method Under Uniaxial Loading

Experimental Study on the Effect of Compaction Work and Defect on the Strength of Soil‐Rock Mixture Subgrade

Experimental Study on Stiffness Softening of Soil‐Rock Mixture Backfill under Metro Train Cyclic Load

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