Soil-Rock Slope Stability Analysis by Considering the Nonuniformity of Rocks

Liu, Shunqing; Huang, Xianwen; Zhou, Aizhao; Hu, Jun; Wang, Wei

doi:10.1155/2018/3121604

Cited by 23 publications

(33 citation statements)

References 32 publications

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“…Clay-gravel mixtures (CGMs) constitute a great engineering material, which is widely utilized in subgrade engineering, rock-fill dams, and sea filling [1][2][3][4]. A CGM is a heterogeneous two-phase material, consisting of low-strength clay and high-strength and large-sized gravels.…”

Section: Introductionmentioning

confidence: 99%

Characterization of the Dynamic Properties of Clay–Gravel Mixtures at Low Strain Level

et al. 2020

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In order to support the dynamic design of subgrade filling engineering, an experiment on the dynamic shear modulus (G) and damping ratio (D) of clay-gravel mixtures (CGMs) was carried out. Forty-two groups of resonant column tests were conducted to explore the effects of gravel content (0%, 10%, 20%, 30%, 40%, 50%, and 60%, which was the mass ratio of gravel to clay), gravel shape (round and angular gravels), and confining pressure (100, 200, and 300 kPa) on the dynamic shear modulus, and damping ratio of CGMs under the same compacting power. The test results showed that, with the increase of gravel content, the maximum dynamic shear modulus of CGMs increases, the referent shear strain increases linearly, and the minimum and maximum damping ratios decrease gradually. In CGMs with round gravels, the maximum dynamic shear modulus and the maximum damping ratio are greater, and the referent shear strain and the minimum damping ratio are smaller, compared to those with angular gravels. With the increase of confining pressure, the maximum dynamic shear modulus and the referent shear strain increase nonlinearly, while the minimum and maximum damping ratios decrease nonlinearly. The predicting equation for the dynamic shear modulus and the damping ratio of CGMs when considering confining pressure, gravel content, and shape was established. The results of this research may put forward a solid foundation for engineering design considering low-strain-level mechanical performance.

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Section: Introductionmentioning

confidence: 99%

Characterization of the Dynamic Properties of Clay–Gravel Mixtures at Low Strain Level

et al. 2020

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“…Soil-rock slopes, consisting of soil and rocks, are extremely heterogeneous slopes that are usually distributed in quaternary loose accumulation layers and mainly formed by residual weathering, landslides, flood alluvium, and so on [1][2][3]. The great difference between soil and rocks in strength and particle size leads to different mechanical properties in soil-rock mixtures [1,[4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

“…[13][14][15]. Liu et al [3,16] combined random establishment method of rock contours and Finite Element Methods, studied the effect of regular rock distribution to the slope stability, and concluded that the stability of a soil-rock slope improves with the increase of rock contents, and the increasing amplitude is highly related to rock distribution characteristics in slopes. In addition, Liu et al [17] adopted a two-phase medium that soil and rocks were considered to have different undrained shear strength to study the stability of a soil-rock slope by FEM and found that the slope obtains the maximum and minimum safety factor when the rocks' long axis is vertical and parallel to the slope surface, respectively, in which the minimum safety factor is always larger than the uniform soil slope.…”

Section: Introductionmentioning

confidence: 99%

“…The specimen obtained the lower cohesive force and internal friction angle when the water content was low or high, respectively. Liu et al [3], according to the dry-wet cracks in soil-rock mixtures, concluded that the weakest part was in the interface between soil and rocks. Based on the results of the soil-rock mixtures from in situ testing and the statistical results of the soil-rock mixtures, Kalender et al [8] found that the strength of the soil-rock mixtures was scattered, distributed in a range rather than a specific value, and had some distribution law which was suitable for analyzing via the fuzzy-based symmetrical method [10,17].…”

Section: Introductionmentioning

confidence: 99%

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A Monte Carlo Approach to Estimate the Stability of Soil–Rock Slopes Considering the Non-Uniformity of Materials

Zhou

Huang

et al. 2020

Symmetry

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A soil–rock slope is a heterogeneous slope composed of soil and rocks that is widely distributed throughout the world. In order to accurately analyze the slope stability of soil–rock mixture, based on a Monte Carlo algorithm (fuzzy-based method), a symmetrical stability analyzing method for soil–rock slopes is proposed, considering the dispersion of strength of soil–rock mixtures. In analyzing it, the numerical model is symmetrical to the real soil–rock slope in geometry and material properties. In addition, the effect of rock content to slope stability was studied by this symmetrical method. The specific work of this paper is as follows: (1) The acquisition method of random number series for the Monte Carlo algorithm and the method of slope stability analysis, using the Monte Carlo method, are introduced. (2) According to in situ samples and remade samples, the strength characteristics of soil–rock mixtures were measured with different rock contents, which proved the scatter of strength of soil–rock mixtures. (3) Based on the measured strength parameters of soil–rock mixtures and the slope landslide, the reliability in analyzing results and superiority in calculating time of using the Monte Carlo method to analyze stability of soil–rock slopes are detailed. (4) The stability of soil–rock slopes with different rock content is discussed with the Monte Carlo method, and it is concluded that with the increase of rock content, the stability of a soil–rock slope decreases first and then increases, and the minimum safety factor is acquired at 20% rock content. (5) Based on a large number of calculation examples, the applied situations of the Monte Carlo method to analyze stability of soil–rock slopes are detailed according to sampling results and rock size.

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“…The common practice is to employ either 1D or 2D measurements, or both (Sonmez et al 2004). Many investigators resolved to use aerial fractions of outcrops (2D surfaces), augmented with field and laboratory tests to obtain the geometric information of bimrock/bimsoil from outcrops (Medley 1994;Xu et al 2008Xu et al , 2011Coli et al 2012;Kahraman et al 2015;Ymeti et al 2017;Liu et al 2018;Meng et al 2018;Yang et al 2019). However, it is not always possible to obtain areal fraction of blocks through image analysis if the blocks are dyed by matrix or the chromatism between blocks and matrix is small.…”

Section: Introductionmentioning

confidence: 99%

Uncertainty of volume fraction in bimrock using the scan-line method and its application in the estimation of deformability parameters

Tien

Juang

et al. 2019

Bull Eng Geol Environ

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The volume fraction within a bimrock or bimsoil is an essential parameter that is useful for estimating the engineering properties of heterogeneous geomaterials. This paper presents analytical and numerical solutions to quantify the uncertainty of volume fraction measurements in bimrock/bimsoil using a scan-line method. The analytical solutions for the mean and variance of volume fraction estimates are based on a representative volume element model. The numerical solution is obtained through simulations of scan-line measurements. This work also employs physical tests using CT scan images from artificial bimrock/bimsoil to validate these solutions. The results demonstrate that the uncertainties of the volume fraction depend on the magnitude of the volume fraction of the blocks, the diameter of the blocks, and the length of the scan line. The proposed analytical and numerical solutions are compared with existing physical experimental tests and analytical solutions. An illustrative example to demonstrate the estimation of the uncertainty of volume fraction using the scan-line measurement is present. Finally, an example application of the volume fraction characterization in the geological engineering, in terms of Young's modulus estimation and characterization, is provided.

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Soil-Rock Slope Stability Analysis by Considering the Nonuniformity of Rocks

Cited by 23 publications

References 32 publications

Characterization of the Dynamic Properties of Clay–Gravel Mixtures at Low Strain Level

Characterization of the Dynamic Properties of Clay–Gravel Mixtures at Low Strain Level

A Monte Carlo Approach to Estimate the Stability of Soil–Rock Slopes Considering the Non-Uniformity of Materials

Uncertainty of volume fraction in bimrock using the scan-line method and its application in the estimation of deformability parameters

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