石灰改性膨胀土冻融循环的强度效应研究  

Study on Strength Effect of Freeze-thaw Cycle of Lime Treated Expansive Soil

作　　者：唐东旗 姚秀芳 王晓岗 赵凯峰 TANG Dongqi;YAO Xiufang;WANG Xiaogang;ZHAO Kaifeng(School of Civil Engineering,Xuchang University,Xuchang 461000,China)

机构地区：[1]许昌学院土木工程学院,河南许昌461000

出　　处：《许昌学院学报》2022年第2期91-94,共4页Journal of Xuchang University

基　　金：河南省科技攻关项目(212102310458);河南省高等学校重点科研项目(16A410003)。

摘　　要：以鹤壁市弱膨胀土为研究对象开展了石灰改性膨胀土冻融循环下强度试验,研究了一定冻融循环次数、石灰配合比与抗剪强度的关系.试验结果表明:上覆压力一定时,石灰含量越高,抗剪强度衰减速率越小.石灰含量一定时,内摩擦角受冻融循环次数的影响越小,石灰含量越高,粘聚力受冻融次数的影响越大;在相同的冻融循环次数下,石灰含量越高,内摩擦角越大.Taking the weak expansive soil in Hebi City as the research object,the strength test of lime treated expansive soil under freeze-thaw cycle was studied.The relationship between a certain number of freeze-thaw cycles,lime mix proportion and shear strength were also studied.Experimental results show that when the overburden pressure is constant,the higher the lime content,the smaller the attenuation of shear strength.When the lime content is constant,the internal friction angle is less affected by the number of freeze-thaw cycles.The higher the lime content,the greater the influence of freeze-thaw cycle times on the cohesion.Considering the same freeze-thaw cycle times,the higher the lime content,the greater the internal friction angle.

关 键 词：膨胀土 石灰改性 冻融循环 抗剪强度 

分 类 号：TU431[建筑科学—岩土工程]