›› 2018, Vol. 39 ›› Issue (6): 2082-2088.doi: 10.16285/j.rsm.2016.1765

• 基础理论与实验研究 • 上一篇    下一篇

钙质砂抗剪强度特性的环剪试验

黄宏翔1, 2,陈育民1, 2,王建平3,刘汉龙1, 2, 4,周晓智1, 2,霍正格1, 2, 5   

  1. 1. 河海大学 岩土力学与堤坝工程教育部重点实验室,江苏 南京 210098;2. 河海大学 土木与交通学院,江苏 南京 210098; 3. 海军工程设计研究局,北京 100070;4. 重庆大学 土木工程学院,重庆 400045; 5. 中铁时代建筑设计院有限公司,安徽 芜湖 241001
  • 收稿日期:2016-10-21 出版日期:2018-06-11 发布日期:2018-07-03
  • 通讯作者: 陈育民,男,1981年生,博士,教授,硕士生导师,主要从事土动力学与土工抗震领域的教学和科研工作。E-mail: ymchenhhu @163.com E-mail:499617449@qq.com
  • 作者简介:黄宏翔,男,1993年生,硕士研究生,主要从事土动力学与土工抗震方面的研究。
  • 基金资助:

    国家自然科学基金面上项目(No.51379067,No.51679072);国家自然科学基金重点国际(地区)合作研究项目(No.51420105013);教育部长江学者创新团队发展计划(No.IRT-15R17)。

Ring shear tests on shear strength of calcareous sand

HUANG Hong-xiang1, 2, CHEN Yu-min1, 2, WANG Jian-ping3, LIU Han-long1, 2, 4, ZHOU Xiao-zhi1, 2, HUO Zheng-ge1, 2, 5   

  1. 1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing, Jiangsu 210098, China; 2. College of Civil and Transportation Engineering, Hohai University, Nanjing, Jiangsu 210098, China; 3. Design and Research Bureau of Navy Engineering, Beijing 100070, China; 4. College of Civil Engineering, Chongqing University, Chongqing 400045, China; 5. China Railway Shidai Architectural Design Institute Co., Ltd., Wuhu, Anhui 241001, China
  • Received:2016-10-21 Online:2018-06-11 Published:2018-07-03
  • Supported by:

    This work was supported by the General Program of National Natural Science Foundation of China (51379067, 51679072), the Funds for International Cooperation and Exchange of the National Natural Science Foundation of China (51420105013) and the Program for Changjiang Scholars and Innovative Research Team in University (IRT-15R17).

摘要: 珊瑚礁沉积的钙质砂与石英砂的物理力学性质有较大差别。对取自南海岛礁的钙质砂进行了单次往返环剪试验以分析钙质砂的抗剪强度特性,试验中考虑了相对密实度和竖向应力对结果的影响,并与相同级配和试验条件下的石英砂进行对比分析。结果表明:钙质砂正向剪切时应力-位移曲线为软化型,具有明显的残余强度特性,而反向剪切时则表现为硬化型,正向和反向剪切强度基本一致;石英砂正向剪切和反向剪切均表现为软化型。钙质砂正向剪切和反向剪切残余强度与峰值强度的比值在0.75~0.93之间;石英砂正向剪切和反向剪切残余强度与对应峰值强度的比值在0.89~0.96之间。相同级配和试验条件下,钙质砂残余强度均大于石英砂,且强度比值基本保持在1.05~1.3之间。在100、200 kPa竖向荷载作用下,钙质砂0.5~2.0 mm的颗粒发生了破碎,破碎率分别为4%和6%。

关键词: 钙质砂, 环剪试验, 残余强度, 颗粒破碎

Abstract: Calcareous sands deposited on coral reefs are different from the quartz sands in their physical and mechanical properties. In this paper, we conducted ring shear tests with a single cycle on the calcareous sand sampled from the South China Sea. The effects of relative density and vertical stress were compared with the quartz sand under the same particle size and test conditions. The results indicate that shear stress and displacement curves of calcareous sand in forward ring shear tests tend to soften with a clear residual strength, while that tend to harden in reversed ring shear tests. The strength in forward and reversed ring shear tests are equal. The curves of the shear stress with displacement of quartz sand in forward and reversed ring shear tests tend to soften. The ratio of residual strength to peak strength of calcareous sand ranges from 0.75 to 0.93, while that of quartz sand ranges from 0.89 to 0.96. Residual strength of calcareous sand is higher than that of quartz sand with same particle size distribution and test conditions and the ratio ranges from 1.05 to 1.3. The particle of calcareous sand, in the size of 0.5 mm to 2 mm, occurs breakage under the vertical loading of 100 kPa and 200 kPa, and breakage percentages of particle are 4% and 6% respectively.

Key words: calcareous sand, ring shear tests, residual strength, particle breakage

中图分类号: 

  • TU 441

[1] 褚福永, 朱俊高, 翁厚洋, 叶洋帆. 粗粒料级配缩尺后最大干密度试验研究[J]. 岩土力学, 2020, 41(5): 1599-1604.
[2] 闫超萍, 龙志林, 周益春, 旷杜敏, 陈佳敏, . 钙质砂剪切特性的围压效应和粒径效应研究[J]. 岩土力学, 2020, 41(2): 581-591.
[3] 芮圣洁, 国振, 王立忠, 周文杰, 李雨杰, . 钙质砂与钢界面循环剪切刚度与阻尼比的试验研究[J]. 岩土力学, 2020, 41(1): 78-86.
[4] 李小刚, 朱长歧, 崔翔, 张珀瑜, 王睿, . 含碳酸盐混合砂的三轴剪切试验研究[J]. 岩土力学, 2020, 41(1): 123-131.
[5] 张晨阳, 谌民, 胡明鉴, 王新志, 唐健健, . 细颗粒组分含量对钙质砂抗剪强度的影响[J]. 岩土力学, 2019, 40(S1): 195-202.
[6] 谢辉辉, 许振浩, 刘清秉, 胡桂阳, . 干湿循环路径下弱膨胀土峰值及残余强度演化研究[J]. 岩土力学, 2019, 40(S1): 245-252.
[7] 柴 维, 龙志林, 旷杜敏, 陈佳敏, 闫超萍. 直剪剪切速率对钙质砂强度及变形特征的影响[J]. 岩土力学, 2019, 40(S1): 359-366.
[8] 胡明鉴, 崔 翔, 王新志, 刘海峰, 杜 韦, . 细颗粒对钙质砂渗透性的影响试验研究[J]. 岩土力学, 2019, 40(8): 2925-2930.
[9] 张凌凯, 王睿, 张建民, 唐新军, . 考虑颗粒破碎效应的堆石料静动力本构模型[J]. 岩土力学, 2019, 40(7): 2547-2554.
[10] 彭宇, 丁选明, 肖杨, 楚剑, 邓玮婷, . 基于染色标定与图像颗粒分割的 钙质砂颗粒破碎特性研究[J]. 岩土力学, 2019, 40(7): 2663-2672.
[11] 孔宪京, 宁凡伟, 刘京茂, 邹德高, 周晨光, . 应力路径和干湿状态对堆石料颗粒破碎的影响研究[J]. 岩土力学, 2019, 40(6): 2059-2065.
[12] 谌民, 张涛, 单华刚, 王新志, 孟庆山, 余克服, . 钙质砂压缩波速与物理性质参数关系研究[J]. 岩土力学, 2019, 40(6): 2275-2283.
[13] 曹 梦, 叶剑红, . 中国南海钙质砂蠕变-应力-时间四参数数学模型[J]. 岩土力学, 2019, 40(5): 1771-1777.
[14] 王 胤, 周令新, 杨 庆. 基于不规则钙质砂颗粒发展的拖曳力系数模型 及其在细观流固耦合数值模拟中应用[J]. 岩土力学, 2019, 40(5): 2009-2015.
[15] 邵生俊, 陈 菲, 邓国华, . 基于平面应变统一强度公式的结构性黄土填料 挡墙地震被动土压力研究[J]. 岩土力学, 2019, 40(4): 1255-1262.
Viewed
Full text


Abstract

Cited

  Shared   
  Discussed   
No Suggested Reading articles found!