Experimental study on creep properties of coral sand
LI Xiao-mei1, WANG Fang1, HAN Lin2, GUAN Yun-fei1
1. Department of Geotechnical Engineering, Nanjing Hydraulic Research Institute, Nanjing 210024, China; 2. College of Mechanics and Materials, Hohai University, Nanjing 211100, China
Abstract:The consolidated drainage shear tests on the coral sand with two kinds of relative densities under different confining pressures are performed, and its peak strength and deformation characteristics are obtained. Then, the creep tests on the samples under four stress levels as well as their particle analysis tests before and after the creep tests are carried out, and the creep properties and creep mechanism of coral sand are studied considering the influences of stress levels and confining pressures. The results show that the creep deformation of coral sand is caused by particle slip, dislocation, particle breakage, particle adjustment and reorganization. The creep deformation characteristics of coral sand are significantly affected by the confining pressures and stress levels, while the densities have no obvious influences. It is shown that the creep deformation of coral sand increases with the increase of confining pressures and stress levels. Finally, the variation law between the creep deformation of coral sand and the confining pressures and stress levels is established.
李小梅, 王芳, 韩林, 关云飞. 珊瑚砂蠕变特性的试验研究[J]. 岩土工程学报, 2020, 42(11): 2124-2130.
LI Xiao-mei, WANG Fang, HAN Lin, GUAN Yun-fei. Experimental study on creep properties of coral sand. Chinese J. Geot. Eng., 2020, 42(11): 2124-2130.
[1] 王者超, 乔丽苹. 土蠕变性质及其模型研究综述与讨论[J].岩土力学, 2011, 32(8): 2251-2260. (WANG Zhe-chao, QIAO Li-ping.A review and discussion on creep behavior of soil and its models[J]. Rock and Soil Mechanics, 2011, 32(8): 2251-2260. (in Chinese)) [2] 温亚楠, 朱鸿鹄, 张诚成, 等. 砂土蠕变特性研究现状及展望[J]. 工程地质学报, 2015(增刊1): 284-291. (WEN Ya-nan, ZHU Hong-hu, ZHANG Cheng-cheng, et al.Current stature and trends on the study of sand creep[J]. Journal of Engineering Geology, 2015(S): 284-291. (in Chinese)) [3] 王者超, 李术才. 高应力下颗粒材料一维力学特性研究(II):蠕变性质[J]. 岩土力学, 2010, 31(11): 3392-3396. (WANG Zhechao, LI Shucai.One-dimensional mechanical behavior of granular materials at high stresses (part II): creep behavior[J]. Rock and Soil Mechanics, 2010, 31(11): 3392-3396. (in Chinese)) [4] 尹建华, 顾凯, 姜洪涛, 等. 砂土高压蠕变微观机理分析[J]. 高校地质学报, 2018, 24(1): 116-121. (YIN Jian-hua, GU Kai, JIANG Hong-tao, et al.Microscopic analysis of sand creep in high pressure[J]. Geological Journal of China Universities, 2018, 24(1):116-121. (in Chinese)) [5] 王艳芳, 蔡燕燕, 蔡正银. 饱和砂土蠕变特性实验[J]. 华侨大学学报(自然科学版), 2017, 38(1): 31-37. (WANG Yan-fang, CAI Yan-yan, CAI Zheng-yin.Experimental investigation of creep properties of saturated sand[J]. Journal of Huaqiao University (Natural Science), 2017, 38(1): 31-37. (in Chinese)) [6] SALAHOU Mohamed Khaled, JIAO Xi-yun, GUO Wei-hua.Discussion of “experimental study on the hydraulic conductivity of calcareous sand in south china sea”[J]. Marine Georesources & Geotechnology, DOI: 10.1080/1064119X.2017.1310964. [7] WEI Hou-zhen, ZHAO Tao, HE Jian-qiao, et al.Evolution of particle breakage for calcareous sands during ring shear tests[J]. International Journal of Geomechanics, 2018, 18(2): 04017153. [8] 汪轶群, 洪义, 国振, 等. 南海钙质砂宏细观破碎力学特性[J]. 岩土力学, 2018, 39(1): 199-206, 215. (WANG Yi-qun, HONG Yi, GUO Zhen, et al.Micro-and macro-mechanical behavior of crushable calcareous sand in south china sea[J]. Rock and Soil Mechanics, 2018, 39(1): 199-206, 215. (in Chinese)) [9] 钱琨, 王新志, 陈剑文, 等. 南海岛礁吹填钙质砂渗透特性试验研究[J]. 岩土力学, 2017, 38(6): 1557-1565. (QIAN Kun, WANG Xin-zhi, CHEN Jian-wen, et al.Experimental study on permeability of calcareous sand for islands in the south china sea[J]. Rock and Soil Mechanics, 2017, 38(6): 1557-1565. (in Chinese)) [10] WANG Ya-song, MA Lin-jian, WANG Ming-yang, et al.A creep constitutive model incorporating deformation mechanisms for crushable calcareous sand[J]. Arabian Journal of Geosdences, 2018(623): 1-8. [11] LÜ Ya-ru, LI Feng, LIU Ya-wen, et al.Comparative study of coral sand and silica sand in creep under general stress states[J]. Canadian Geotechnical Journal, 2016: 1-38. [12] 张小燕, 蔡燕燕, 王振波, 等. 珊瑚砂高压力下一维蠕变分形破碎及颗粒形状分析[J]. 岩土力学, 2018, 39(5): 1573-1580. (ZHANG Xiao-yan, CAI Yan-yan, WANG Jiang-bo, et al.Fractal breakage and particle shape analysis for coral sand under high-pressure and one-dimensional creep conditions[J]. Rock and Soil Mechanics, 2018, 39(5):1573-1580. (in Chinese)) [13] 曹梦, 叶剑红. 南海钙质砂蠕变-应力-时间四参数数学模型[J]. 岩土力学, 2019, 40(5):1-8. (CAO Meng, YE Jian-hong.Creep-stress-time four parameters mathematical model of calcareous sand in south china sea[J]. Rock and Soil Mechanics, 2019, 40(5):1-8. (in Chinese))