摘要
运用应变控制式直剪仪,对不同含水率及粗颗粒砂含量的南阳重塑黄褐土开展直剪实验,分析含水率、粗颗粒砂含量对土体抗剪强度、黏聚力及内摩擦角的影响;实验结果表明:抗剪强度都随着垂直压力的增大而增大;随着含水率的增加而降低;黏聚力、内摩擦角随土样的含水率的增加而减少;含水率低于16%,对内摩擦角影响较小;在16~22%间,含水率对内摩擦角影响明显;含水率大于22%,含水率对内摩擦角影响较小。黄褐土含水率在15%情况下,粗颗粒砂含量影响对其力学特性影响明显:黄褐土和砂粒的含量分别为60%和40%时,重塑土的抗剪强度达到最大值;粗砂粒含量由20%增加到60%,由粗颗粒砂与黄褐土组成混合体的粘聚力迅速减小到最小;粗砂粒含量由60%增加到80%,混合体的粘聚力迅速增加,其粘聚力在砂粒含量60%达最低;砂粒含量由20%增加到50%,其內摩擦角迅速增加到最大,砂粒含量由50%增加到80%,其內摩擦角迅速降低到32.92°。
In order to analyze theinfluence of moisture contentandcoarse content to shear strength # cohesion and internal friction angleabout remolded yellow-cinnamon soil located in Nanyang, the direct tests were carried about with different moistureccntent and coarsecontent by direct shear apparatus. The results showed that the shear strength increase with vertical with moisture content increase. The internal friction angle and cohesion decrease with moisture content increase. ler when moistiare content is lower than 16% or higher than 22% , but is significant when moistiire content between 16% and 22% .The influence is significant about the coarse content to the mechanical property of yellow-cinnamon soshear strength is the biggest when the coarse content is 40% . The cohesion decrease to the lowest when the coarse content increase to60% , and the cohesion increase witli the coarse content increase from 60% to 80% . The internal friction angle is the biggest when the coarse content is 50% . The internal friction angle increase wit ! i the coarse content increase when it is lower than 5 0 % , and decrease to 32. 920with the coarse content increase to 80% when it is higher than 50% .
出处
《南阳理工学院学报》
2017年第2期47-51,共5页
Journal of Nanyang Institute of Technology
基金
国家自然科学基金面上项目(41672357)
国家自然科学资助项目(41372331)
国家国际科技合作专项项目(2013DFA21720)
河南省科技公关项目(162102310253)
河南省高等学校重点科研项目(15A410005)
关键词
南阳黄褐土
直剪试验
内摩擦角
黏聚力
remolded cinnamon soil
direct shear test
internal friction angle
cohesion
