Experimental study of the behavior of soil-gravel mixtures
WANG Teng1, HU Daisong2, ZHANG Ga1
1. State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China; 2. China Three Gorges Corporation, Chengdu 610041, China
Abstract:The strength and deformation characteristics of the soil-gravel mixtures must be studied for disaster prevention and to improve safety. Serialized plain strain tests are conducted on various soil-gravel mixtures with aluminum bars used to simulate the gravel. The tests show that the gravel content and gravel shape significantly affect the strength and deformation of the soil-gravel mixtures. The peak strength and dilatancy characteristics increase as the gravel content increases and the gravel becomes more psephitic. Measurements of the gravel movement show that the gravel impedes the formation and development of the shear band by providing a rolling resistance which increases the peak strength.
王腾, 胡岱松, 张嘎. 土石混合料力学特性的试验研究[J]. 清华大学学报(自然科学版), 2018, 58(5): 456-460.
WANG Teng, HU Daisong, ZHANG Ga. Experimental study of the behavior of soil-gravel mixtures. Journal of Tsinghua University(Science and Technology), 2018, 58(5): 456-460.
[1] 徐文杰, 张海洋. 土石混合体研究现状及发展趋势[J]. 水利水电科技进展, 2013, 33(1):80-88. XU W J, ZHANG H Y. Research status and development trend of soil-rock mixture[J]. Advances in Science and Technology of Water Resources, 2013, 33(1):80-88. (in Chinese) [2] 孙田, 陈国兴, 王炳辉, 等. 砾石颗粒形状对砂砾土动剪切模量和阻尼比影响的试验研究[J]. 岩石力学与工程学报, 2014, 33(S2):4211-4217. SUN T, CHEN G X, WANG B H, et al. Experimental research of effect of granule shape on shear modulus and damping ratio of gravel[J]. Chinese Journal of Rock Mechanics and Engineering, 2014, 33(S2):4211-4217. (in Chinese) [3] 薛亚东, 刘忠强, 黄宏伟. 砂砾石混合物抗剪强度特性试验研究[J]. 土木建筑与环境工程, 2012, 34(6):75-79. XUE Y D, LIU Z Q, HUANG H W. Experimental analysis on shear strength characteristics of sand-gravel mixtures[J]. Journal of Civil, Architectural & Environmental Engineering, 2012, 34(6):75-79. (in Chinese) [4] AMINI Y, HAMIDI A, ASGHARI E. Shear strength-dilation characteristics of cemented sand-gravel mixtures[J]. International Journal of Geotechnical Engineering, 2014, 8(4):406-413. [5] HAMIDI A, YAZDANJOU V, SALIMI N. Shear strength characteristics of sand-gravel mixtures[J]. International Journal of Geotechnical Engineering, 2009, 3(1):29-38. [6] VALLEJO L E, MAWBY R. Porosity influence on the shear strength of granular material-clay mixtures[J]. Engineering Geology, 2000, 58(2):125-136. [7] SIMONI A, HOULSBY G T. The direct shear strength and dilatancy of sand-gravel mixtures[J]. Geotechnical & Geological Engineering, 2006, 24(3):523-549. [8] 傅华, 陈生水, 韩华强, 等. 胶凝砂砾石料静、动力三轴剪切试验研究[J]. 岩土工程学报, 2015, 37(2):357-362. FU H, CHEN S S, HAN H Q, et al. Experimental study on static and dynamic properties of cemented sand and gravel[J]. Chinese Journal of Geotechnical Engineering, 2015, 37(2):357-362. (in Chinese) [9] 邓华锋, 原先凡, 李建林, 等. 土石混合体直剪试验的破坏特征及抗剪强度取值方法研究[J]. 岩石力学与工程学报, 2013, 32(S2):4065-4072. DENG H F, YUAN X F, LI J L, et al. Research on failure characteristics and determination method for shear strength of earth-rock aggregate in direct shear tests[J]. Chinese Journal of Rock Mechanics and Engineering, 2013, 32(S2):4065-4072. (in Chinese) [10] SEIF EI DINE B, DUPLA J C, FRANK R, et al. Mechanical characterization of matrix coarse-grained soils with a large-sized triaxial device[J]. Canadian Geotechnical Journal, 2010, 47(4):425-438. [11] 王腾, 张嘎. 块体加固土体大型直剪试验[J]. 清华大学学报(自然科学版), 2016, 56(11):1209-1212. WANG T, ZHANG G. Large-scale direct shear tests of block-reinforced soil[J]. Journal of Tsinghua University (Science and Technology), 2016, 56(11):1209-1212. (in Chinese) [12] COLI N, BERRY P, BOLDINI D. In situ non-conventional shear tests for the mechanical characterisation of a bimrock[J]. International Journal of Rock Mechanics and Mining Sciences, 2011, 48(1):95-102. [13] 欧阳振华, 李世海, 戴志胜. 块石对土石混合体力学性能的影响[J]. 实验力学, 2010, 25(1):61-67. OUYANG Z H, LI S H, DAI Z S. On the influence factors of mechanical properties for soil-rock mixture[J]. Journal of Experimental Mechanics, 2010, 25(1):61-67. (in Chinese) [14] 贾学明, 柴贺军, 郑颖人. 土石混合料大型直剪试验的颗粒离散元细观力学模拟研究[J]. 岩土力学, 2010, 31(9):2695-2703. JIA X M, CHAI H J, ZHENG Y R. Mesomechanics research of large direct shear test on soil and rock aggregate mixture with particle flow code simulation[J]. Rock and Soil Mechanics, 2010, 31(9):2695-2703. (in Chinese) [15] 徐文杰, 胡瑞林, 岳中琦, 等. 基于数字图像分析及大型直剪试验的土石混合体块石含量与抗剪强度关系研究[J]. 岩石力学与工程学报, 2008, 27(5):996-1007. XU W J, HU R L, YUE Z Q, et al. Research on relationship between rock block proportion and shear strength of soil-rock mixtures based on digital image analysis and large direct shear test[J]. Chinese Journal of Rock Mechanics and Engineering, 2008, 27(5):996-1007. (in Chinese) [16] 田湖南, 焦玉勇, 王浩, 等. 土石混合体力学特性的颗粒离散元双轴试验模拟研究[J]. 岩石力学与工程学报, 2015, 34(S1):3564-3573. TIAN H N, JIAO Y Y, WANG H, et al. Research on biaxial test of mechanical characteristics on soil-rock aggregate (SRA) based on particle flow code simulation[J]. Chinese Journal of Rock Mechanics and Engineering, 2015, 34(S1):3564-3573. (in Chinese) [17] 杨冰, 杨军, 常在, 等. 土石混合体压缩性的三维颗粒力学研究[J]. 岩土力学, 2010, 31(5):1645-1650. YANG B, YANG J, CHANG Z, et al. 3-D granular simulation for compressibility of soil-aggregate mixture[J]. Rock and Soil Mechanics, 2010, 31(5):1645-1650. (in Chinese) [18] 李世海, 汪远年. 三维离散元土石混合体随机计算模型及单向加载试验数值模拟[J]. 岩土工程学报, 2004, 26(2):172-177. LI S H, WANG Y N. Stochastic model and numerical simulation of uniaxial loading test for rock and soil blending by 3D-DEM[J]. Chinese Journal of Geotechnical Engineering, 2004, 26(2):172-177. (in Chinese) [19] 廖秋林, 李晓, 朱万成, 等. 基于数码图像土石混合体结构建模及其力学结构效应的数值分析[J]. 岩石力学与工程学报, 2010, 29(1):155-162. LIAO Q L, LI X, ZHU W C, et al. Structure model construction of rock and soil aggregate based on digital image technology and its numerical simulation on mechanical structure effects[J]. Chinese Journal of Rock Mechanics and Engineering, 2010, 29(1):155-162. (in Chinese) [20] XU W J, XU Q, HU R L. Study on the shear strength of soil-rock mixture by large scale direct shear test[J]. International Journal of Rock Mechanics and Mining Sciences, 2011, 48(8):1235-1247. [21] LINDQUIST E S. The strength and deformation properties of mélange[D]. Berkeley, USA:University of California at Berkeley, 1994.