Some geomechanical properties of soil–rock mixtures in the Hutiao Gorge area, China

Abstract

Soil–rock mixtures, which are very complicated inhomogeneous materials, are widely encountered in geotechnical engineering projects. In this paper, in situ tests were performed on six samples of soil–rock mixtures in the Hutiao Gorge reservoir area to examine their mechanical characteristics. The deformation of the mixtures is closely related to the weight proportion of rock fragments and their size distribution, indicating that there may be critical fragment sizes that influence their mechanical properties, particularly cohesion. The soil–rock mixtures are sensitive to water. The results of the comparison between the tests of natural soil–rock mixtures and simulated-rain soil–rock mixtures give useful measured data for engineering evaluation and design. For natural soil–rock mixtures the cohesion c was 1·53 kPa and the internal friction angle ϕ was 46·0°; for saturated soil–rock mixtures c was 0·30 kPa and ϕ was 59·2°.

An assessment on the indirect determination of the volumetric block proportion of Misis fault breccia (Adana, Turkey)

“…However, the separation of blocks from the matrix is very difficult in most situations, and sieve analysis can be practical for the laboratory studies (Medley 2002;Goodman and Ahlgren 2000;Sonmez et al 2004). Nevertheless, some researchers (Xu et al 2007;Coli et al 2009Coli et al , 2011 have performed in situ sieve analysis for the determination of VBP.…”

Investigation of scale effect of numerical unconfined compression strengths of virtual colluvial–deluvial soil–rock mixture

“…The soil-rock mixture (SRM) is a term describing the distinctively chaotic geo-materials composed of a variety of stronger blocks (rock) with different lithologies and sizes embedded in pervasively fine-grained weaker matrix (soil) [1][2][3][4]. Despite of a few researches focused on this geo-material, different terminologies have been used in the literature for mixed geo-materials similar to SRM, such as bimrock , mélange [6][7][8][9][10][11][12][13][14], rock and soil aggregate [30], conglomerates [33], to name a few.…”

“…The studies on the aforementioned geo-materials can be summarized primarily based on two categories including the inherent attributes of the geo-material (study-A) [8][9][10][11]28,36], and the geo-mechanical response subject to various external driving forces (study-B) [1][2][3][4][6][7][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][29][30][31][32][33][34].…”

Experimental study on meso-damage cracking characteristics of RSA by CT test

“…Also, block size distributions based on chords were proposed to study the filed distribution characteristics of RSA. You and Tang (2002) and Xu and Hu (2007) studied the physical and mechanical properties of RSA and the influential factors through in situ tests. Chen et al (2005) studied the spatial factors such as the configuration, structure, environment, and evolution of RSA from the point of the spatial effect of RSA slope in large scales.…”