| 冻融循环影响风化砂改良膨胀土抗剪强度室内试验研究 |
| |
| 引用本文： | 杨俊,童磊,许威,张国栋.冻融循环影响风化砂改良膨胀土抗剪强度室内试验研究[J].工程地质学报(英文版),2015,23(1):65-71. |
| |
| 作者姓名： | 杨俊 童磊 许威 张国栋 |
| |
| 作者单位： | 1.三峡大学三峡地区地质灾害与生态环境湖北省协同创新中心 宜昌 443002; |
| |
| 基金项目： | 湖北省教育厅自然科学研究重点项目(D20131304)资助． |
| |
| 摘 要： | 本文以三峡库区广泛分布的风化砂来改良膨胀土,通过在膨胀土中掺入10%、20%、30%、40%、50%的风化砂,进行1、3、6、9、12次冻融循环,最后对不同冻融循环次数作用后改良膨胀土制备样进行直接剪切试验,测定不同掺砂量及不同冻融次数下,各试样的强度参数,得出冻融循环对风化砂改良膨胀土抗剪强度指标及强度规律的影响.试验结果表明:在同一掺砂比例下,风化砂改良膨胀土的抗剪指标和抗剪强度随冻融循环次数的增大而减小,最后逐渐趋于稳定,其中黏聚力与冻融循环次数呈对数关系; 在同一冻融循环次数下,黏聚力随掺砂比例的增大而减小,内摩擦角随掺砂比例的增大而增大.
|
| 关 键 词： | 膨胀土 冻融循环 风化砂 抗剪强度 |
| 收稿时间： | 2014-01-12 |
LABORATORY RESEARCH ON EFFECT OF FREEZE-THAW CYCLES TO SHEAR STRENGTH OF WEATHERED SAND IMPROVED WITH EXPANSIVE SOIL |
| |
| YANG Jun,TONG Lei,XU Wei,ZHANG Guodong.LABORATORY RESEARCH ON EFFECT OF FREEZE-THAW CYCLES TO SHEAR STRENGTH OF WEATHERED SAND IMPROVED WITH EXPANSIVE SOIL[J].Journal of Engineering Geology,2015,23(1):65-71. |
| |
| Authors: | YANG Jun TONG Lei XU Wei ZHANG Guodong |
| |
| Institution: | 1.Collaborative Innovation Center of Geological Hazards and Ecological Environment in Three Gorges Area in Hubei Province, China Three Gorges University, Yichang 443002;2.Civil and Architectural Institute, China Three Gorges University, Yichang 443002 |
| |
| Abstract: | This paper investigates the qualitative and quantitative relationships among shear strength of weathered sand improved with expansive soil, weathered sand content and cycle times of freeze-thaw tests. The expansive soil is added with weathered sand with the percentages of 0, 10%, 20%, 30%, 40%, 50%,respectively. The shear strength test is done using direct shear apparatus on the samples after 0, 1, 3, 6, 9, 12 cycles of freezing and thawing. Test results show that as the cycles of freeze-thaw increases, the shear indexes and the shear strength of weathered sand improved expansive soil first increase and then decrease and gradually reach stable after several times of freeze-thaw cycles for samples with the same sand ratio. The relationship between cohesive force and freeze-thaw cycles can be expressed in logarithmic function. As the mixed sand ratio increases, the cohesion decrease but the internal frictional angle increases for samples with the same cycles of freeze and thaw. |
| |
| Keywords: | Expansive soil Freeze-thaw cycle Weathered sand Shear strength |
| 本文献已被 万方数据 等数据库收录！ |
| 点击此处可从《工程地质学报(英文版)》浏览原始摘要信息 |
| 点击此处可从《工程地质学报(英文版)》下载免费的PDF全文 |
|
