| 基于结构性的冻结黄土力学特性试验研究 |
| |
| 引用本文： | 丑亚玲,蒋先刚,何彬彬,盛煜.基于结构性的冻结黄土力学特性试验研究[J].冰川冻土,2014,36(4):913-921. |
| |
| 作者姓名： | 丑亚玲 蒋先刚 何彬彬 盛煜 |
| |
| 作者单位： | 1. 兰州理工大学 甘肃省土木工程防灾减灾重点实验室, 甘肃 兰州 730050;2. 西部土木工程防灾减灾教育部工程研究中心, 甘肃 兰州 730050;3. 中国科学院 寒区旱区环境与工程研究所 冻土工程国家重点实验室, 甘肃 兰州 730000;4. 中国科学院 山地灾害与地表过程重点实验室, 四川 成都 610041 |
| |
| 基金项目： | 国家自然科学基金项目(50908111);冻土工程国家重点实验室开放基金项目(SKLFSE201003);中国博士后科学基金项目(BS04200905);兰州理工大学优秀青年教师基金项目(Q200911);甘肃省自然科学基金项目(1014RJZA026);兰州理工大学建工七七基金项目(1014RJZA026)资助 |
| |
| 摘 要： | 通过对重塑冻结黄土和人工结构性冻结黄土（通过对重塑黄土添加水泥获取）进行室内三轴剪切试验，研究了围压、含水量、温度、水泥含量等因素对冻结黄土力学行为的影响. 结果表明：不同试验条件下，非饱和土试样和饱和土试样的应力-应变关系呈现不同的特点. 温度和围压是影响冻土体强度的主要因素，温度越低，其破坏强度越高；非饱和土样强度随围压增大而增大，饱和土体强度受围压影响很小. 初始含水量是影响冻土体强度的另一主要因素，对非饱和土样，随着含水量的增加土体强度逐渐增高，达到某一峰值之后随含水量继续增加而减小，饱和土体强度最低. 对非饱和土样，水泥含量越高，对应的破坏强度也就越大；但对饱和土样，水泥含量对冻土的应力-应变行为及强度影响不大. 最后，提出了与所试验土体强度参数相关的综合性系数M，通过回归分析，得出了其与c和tan φ的关系，并验证了其可靠性.
|
| 关 键 词： | 冻结黄土 人工制备结构性土 三轴试验 力学特性 |
| 收稿时间： | 2014-03-18 |
| 修稿时间： | 2014-06-18 |
Experimental study of frozen loess mechanical behaviour based on constitutive property |
| |
| CHOU Yaling,JIANG Xiangang,HE Binbin,SHENG Yu.Experimental study of frozen loess mechanical behaviour based on constitutive property[J].Journal of Glaciology and Geocryology,2014,36(4):913-921. |
| |
| Authors: | CHOU Yaling JIANG Xiangang HE Binbin SHENG Yu |
| |
| Abstract: | In this paper, based on triaxial compression tests of remolded frozen loess and artificially structured frozen loess with different amounts of cement, the effects of confining pressure, initial water content, temperature and cement amount on the frozen loess' mechanical behavior are studied. It is found that there are differences in stress-strain relationship between unsaturated and saturated frozen loess, depending on experimental conditions. The temperature and confining pressure are the main factors which influence the shearing strengths of frozen soil. The lower the temperature is, the higher the failure strength is. The shearing strength of unsaturated frozen loess increases with confining pressure, but that of saturated frozen loess has dependent on confining pressure a little. The initial water content is another main factor affecting the frozen loess strength. As increasing water content, the frozen loess strength is also increasing. After the water content reaching a peak point, the frozen loess strength would decrease gradually with the water content increasing. The strength of saturated frozen loess will be the lowest. With regard to the unsaturated frozen loess, the shearing strength of the unsaturated frozen loess increases with the amount of cement, but that of saturated frozen loess has a little dependent on cement amount. At last, a comprehensive coefficient M is put forward, which correlates closely with parameters of shear strength. By regression analysis, two exponential function relationships between M and c and between M and tan φ are obtained, respectively, of which the reliability is verified. |
| |
| Keywords: | frozen loess artificially structured soil triaxial test mechanical behavior |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
| 点击此处可从《冰川冻土》浏览原始摘要信息 |
| 点击此处可从《冰川冻土》下载免费的PDF全文 |
|
