水泥及石灰掺量对改良膨胀土抗剪强度的影响  

Effect on Shear Strength of Improved Expansive Soil with Addition Amounts of Cement and Lime

作　　者：韩晶[1] 王乐华[1] 马莉[2] 杨超[1] 

机构地区：[1]三峡大学土木与建筑学院,湖北宜昌443002 [2]中国电建集团贵阳勘测设计研究院,贵州贵阳550081

出　　处：《人民黄河》2015年第4期137-139,144,共4页Yellow River

摘　　要：以南水北调中线工程淅川段的膨胀土为研究对象,分别采用水泥和石灰对膨胀土进行改良,其掺量分别为2%、4%和6%,在分别养护7 d和28 d条件下,进行直剪试验,研究水泥和石灰掺量对改良膨胀土抗剪强度的影响。研究表明:水泥和石灰均能有效地抑制膨胀土的膨胀性,并且随着掺量的提高、养护时间的加长,改性膨胀土的抗剪强度、黏聚力和摩擦角进一步得到提高;水泥相对于石灰对膨胀土抗剪强度影响更大。Taking the expansive soil from the Middle Route of South-to-North Water Transfer Project in Xichuan section of Henan Prov-ince as a research object,it used cement and lime to improve the expansive soil respectively and studied the change law of shear strength. It also studied on the improved expansive soil through direct shear test under the conditions of curing 7 d and 28 d with addition amounts 2%, 4% and 6% of cement and lime respectively. The study shows that cement and lime can restrain the expansion of expansive soil effectively, and with the increase of amount of adding amounts and the curing time,the shear strength,the cohesion c and friction angle φ of the im-proved expansive soil are improved. Under the same condition,the cement has more influence relatively on expansive soil shear strength.

关 键 词：膨胀土 水泥 石灰 抗剪强度 南水北调中线工程 

分 类 号：TV42[水利工程—水工结构工程]