Review of the study on deformation, failure and the mesomechanisms of rock-soil mixture (RSM)

Abstract

中国科学: 技术科学 2014 年 第 44 卷 第 2 期 173 rock-soil mixture, deformation and failure, mesoscopic mechanism, experiment methods, structural model, numerical analysis

Experimental Study on Seepage Characteristics of a Soil-Rock Mixture in a Fault Zone

“…Soil-rock mixture is a special geological body between soil and rock mass [11][12][13][14][15], due to the interaction between soil particles and gravel, soil-rock mixture has unique structure, naturalness, heterogeneity and discontinuity [16][17][18][19]. At present, experimental methods and numerical simulation methods are mostly used to study its seepage characteristics.…”

Study on large scale direct shear test on soil-rock mixture with multiple grain grades in high fill slope engineering

“…In order to facilitate differentiation and analysis, for soil-rock mixtures used as fill slope materials through manual compaction, the state after on-site compaction is called the original state of the project, which refers to the actual state during construction and use. Currently, the research objects of shear strength of soil-rock mixtures mainly focus on mixtures composed of sand and gravel (Sun, et al, 2014, Xu, et al, 2013, and a series of studies have been conducted on key factors affecting shear strength, such as gravel content (Tang, et al, 2018, Coli, et al, 2011, Yang, et al, 2016, Hamidi, et al, 2009 and particle size (Xia, et al, 2019, Zhao, et al, 2017,Simoni, et al, 2006, Weng, et al, 2013, particle breakage (Wei, et al, 2013, and moisture content (Xue, et al, 2015, Li, et al, 2007, Xu, et al, 2006, from both on-site in-situ tests and laboratory remolding tests, and have achieved consistent results. However, relatively little research has been conducted on the shear strength of soil-rock mixtures with skeleton components spanning six orders of magnitude, from micron-sized clay particles to tens of centimeter-sized rock blocks, in the original state of the project (Zhang, et al, 2016, Liu, et al, 2004.…”

Study on the shear resistance characteristics of clay-stone mixtures under freeze-thaw cycles based on nuclear magnetic resonance

“…As one of the widely used building materials in the field of engineering, cohesive soil-rock mixture is a major component of reservoir slopes and soil-rock dams. However, the significant physical property differences between the soil and rock blocks result in noticeable nonlinear mechanical characteristics [1] [2]. In the cold regions of northwest China where there is a large temperature difference between day and night, the surfaces of reservoir slopes and the buried soil-rock mixtures in hydraulic engineering projects are subjected to long-term freeze-thaw cycles, leading to significant changes in the structural distribution and moisture content of soil particles [3] [4].…”

“…In order to reveal the shear strength variation law of cohesive soil-rock mixtures at a microscopic level, researchers conducted non-destructive and rapid nuclear magnetic resonance testing of its microstructure [9]. Considering the heterogeneity, discontinuity, and randomness of the soil-rock mixture, fractal theory is introduced to more clearly quantify the internal morphological changes of the material [10] [11]. Liu Xinrong et al [12] studied the shear characteristics of mixed soil under the influence of multiple factors, obtained the fractal characteristics of shear surfaces and evolution of shear strength.…”