›› 2017, Vol. 38 ›› Issue (S2): 51-56.doi: 10.16285/j.rsm.2017.S2.007

• 基础理论与实验研究 • 上一篇    下一篇

广吸力范围内压实红黏土的强度特性

孙德安,何家浩,高 游   

  1. 上海大学 土木工程系,上海 200444
  • 收稿日期:2017-07-06 出版日期:2017-11-23 发布日期:2018-06-05
  • 作者简介:孙德安,男,1962年生,博士,教授,主要从事土力学的研究。
  • 基金资助:

    国家自然科学基金项目(No. 11672172)。

Strength characteristics of compacted lateritic clay in a wide range of suction

SUN De-an, HE Jia-hao, GAO You   

  1. Department of Civil Engineering, Shanghai University, Shanghai 200444, China
  • Received:2017-07-06 Online:2017-11-23 Published:2018-06-05
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (11672172)

摘要: 为了研究广吸力范围内红黏土的强度特性,采用经压力板法饱和,对盐溶液蒸汽平衡法吸力平衡后的非饱和桂林红黏土样进行一系列常含水率直剪试验。高吸力时土–水特征曲线不受土体密度的影响,故等含水率试验可以认为是等吸力试验。试验结果表明,随着平衡吸力的增加,非饱和红黏土的抗剪强度与黏聚力均先增大后减小,吸力为7 MPa左右时出现抗剪强度的最大值;当吸力超过7 MPa后内摩擦角基本保持不变,说明高吸力阶段吸力增大引起的强度变化是由黏聚力的变化引起的;吸力超过70 MPa后随着吸力的增加,强度变化较小。最后结合压汞试验的结果,从孔隙大小分布的角度解释了红黏土在广吸力范围内的强度特性。

关键词: 红黏土, 抗剪强度, 吸力, 压汞试验, 孔径分布

Abstract: In order to investigate the strength characteristics of lateritic clay in a wide range of suction, a series of constant water content direct shear tests is carried out on the unsaturated Guilin lateritic clay. With regard to the suction applied, the suctions can be imposed by using the pressure plate method and vapor equilibrium method. The effect of soil density on soil-water characteristic curve can be ignored, and thus the test under constant water content is that at constant suction. The test results show that with the increase of suction, unsaturated shear strength and total cohesion increase first and then decrease, and reach a maximum values at suction of 7 MPa. The internal friction angle does not change significantly when the suction is higher than 7 MPa, indicating that the suction contributes to the shear strength by changing the cohesion in a high range of suction. When suction is higher than 70 MPa, shear strength varies slightly with increase of suction. Finally, by using results of mercury intrusion porosimetry tests, strength characteristics of Guilin lateritic clay in a wide range of suction are explained from the perspective of pore-size distribution.

Key words: lateritic clay, shear strength, suction, mercury intrusion porosimetry, pore-size distribution

中图分类号: 

  • TU443

[1] 桂跃, 吴承坤, 赵振兴, 刘声钧, 刘锐, 张秋敏. 微生物分解有机质作用对泥炭土工程性质的影响[J]. 岩土力学, 2020, 41(S1): 147-155.
[2] 郑方, 邵生俊, 佘芳涛, 袁浩, . 重塑黄土在不同基质吸力下的真三轴剪切试验[J]. 岩土力学, 2020, 41(S1): 156-162.
[3] 刘杰, 杨玉婳, 姚海林, 卢正, 岳婵, . 基于不同改性方法的分散性黏土处治试验研究[J]. 岩土力学, 2020, 41(S1): 163-170.
[4] 邹先坚, 王益腾, 王川婴. 钻孔图像中岩石结构面三维形貌特征及 优势抗滑方向研究[J]. 岩土力学, 2020, 41(S1): 290-298.
[5] 谈云志, 胡焱, 曹玲, 邓永锋, 明华军, 沈克军, . 偏高岭土协同石灰钝化红黏土水敏性的机制[J]. 岩土力学, 2020, 41(7): 2207-2214.
[6] 瑜璐, 杨庆, 杨钢, 张金利. 塑性极限分析鱼雷锚锚尖贯入阻力[J]. 岩土力学, 2020, 41(6): 1953-1962.
[7] 谌文武, 贾全全, 童艳梅. 莫高窟壁画地仗土-水特征曲线的测定与拟合[J]. 岩土力学, 2020, 41(5): 1483-1491.
[8] 孙银磊, 汤连生, 刘洁, . 非饱和土微观结构与粒间吸力的研究进展[J]. 岩土力学, 2020, 41(4): 1095-1122.
[9] 李潇旋, 李涛, 李舰, 张涛. 循环荷载下非饱和结构性黏土的弹塑性双面模型[J]. 岩土力学, 2020, 41(4): 1153-1160.
[10] 牛庚, 邵龙潭, 孙德安, 韦昌富, 郭晓霞, 徐华. 土−水特征曲线测量过程中孔隙分布的演化规律探讨[J]. 岩土力学, 2020, 41(4): 1195-1202.
[11] 方瑾瑾, 冯以鑫, 余永强, 李震, 林志斌, . 真三轴条件下的原状黄土增湿变形特性[J]. 岩土力学, 2020, 41(4): 1235-1246.
[12] 刘建民, 邱月, 郭婷婷, 宋文智, 谷川, . 饱和粉质黏土静剪强度与振动后 静剪强度对比研究[J]. 岩土力学, 2020, 41(3): 773-780.
[13] 王立业, 周凤玺, 秦虎, . 饱和盐渍土分数阶蠕变模型及试验研究[J]. 岩土力学, 2020, 41(2): 543-551.
[14] 李潇旋, 李涛, 彭丽云, . 控制吸力循环荷载下非饱和黏性土 的弹塑性双面模型[J]. 岩土力学, 2020, 41(2): 552-560.
[15] 涂园, 王奎华, 周建, 胡安峰, . 有效应力法和有效固结压力法在预压地基 强度计算中的应用[J]. 岩土力学, 2020, 41(2): 645-654.
Viewed
Full text


Abstract

Cited

  Shared   
  Discussed   
No Suggested Reading articles found!