冻融作用对人工结构性黄土抗剪性能的影响  

Effect of freeze-thaw action on shearing behavior of artificially structural loess

作　　者：丑亚玲[1,2] 刘丽萍[1,2] 毛建勋 朱彦鹏[1,2] 王浩 刘治国[1] 

机构地区：[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]兰州理工大学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]核工业280研究所,四川广汉618300 [4]西和县财政局农业综合开发办公室,甘肃陇南742100

出　　处：《兰州理工大学学报》2014年第4期115-119,共5页Journal of Lanzhou University of Technology

基　　金：国家自然科学基金(50908111);中科院冻土工程国家重点实验室开放基金(SKLFSE201003);甘肃省自然科学基金(1014RJZA026);博士后科学基金(BS04200905)

摘　　要：对重塑黄土及人工结构性黄土进行冻融前后的直接剪切试验,分析冻融作用对不同含水量、不同水泥含量土样的抗剪强度及相关指标的影响.结果表明:经过冻融作用后土样粘聚力变大而内摩擦角无明显变化;含水量和水泥含量对冻融前后土样的抗剪强度均有影响.含水量不变时,随水泥含量的增大,冻融前后土样的内摩擦角均变化不大而粘聚力变大.水泥含量不变时,随含水量的增大,冻融前后土样的粘聚力先增大后减小,内摩擦角变化不大;同一条件下,冻融后的土体结构强度高于冻融前的,冻融前后土体结构强度均随水泥含量的增加而提高;相同的击实功下,不同含水量土体的初始干密度有一定差异,导致试验结果呈现出较复杂的特点.The direct shear tests of remolded loess and artificially structural loess are performed. The influence of freeze-thaw action on shear strength and related indexes of soil samples with different water contents and cement contents is analyzed. The result shows that freeze-thaw action makes cohesion of soil samples become bigger, there is no prominent change of internal friction angle. Both the water content and cement content have influence on the shear strength of the soil samples before and after freeze-thaw circle. When the water content remains constant, the internal friction angle of soil samples has changed a little with the cement content before and after freeze-thaw circle, but the cohesion has been larger. When the cement content keeps constant, the cohesion has increased first and then decreased with the water content, but the internal friction angle has changed a little. Under the same condition, the structural strength of soil after freeze-thaw is higher than that before freeze-thaw. The structural strength of soil has increased with the cement content before and after freeze-thaw. Even under the same compaction energy, there are some differences in initial dry density of the soils with different water contents. So, the test results may present more complex features. 〈

关 键 词：人工制备结构性土 直剪试验 冻融作用 结构强度 

分 类 号：TU445[建筑科学—岩土工程]