冻融循环作用下水泥土疲劳特性  

Fatigue properties of cement soil under action of freeze-thaw cycles

作　　者：陈四利 赵百超 侯芮 CHEN Si-li;ZHAO Bai-chao;HOU Rui(School of Architecture and Civil Engineering, Shenyang University of Technology, Shenyang 110870, China)

机构地区：[1]沈阳工业大学建筑与土木工程学院,沈阳110870

出　　处：《沈阳工业大学学报》2021年第6期692-697,共6页Journal of Shenyang University of Technology

基　　金：国家自然科学基金项目(51608332,51279109).

摘　　要：为了探究水泥土在冻融循环条件下的力学特性,通过无侧限抗压试验研究水泥土抗压强度随水泥掺量、冻融次数和温度的变化规律,通过疲劳试验研究水泥土的疲劳寿命随冻融次数和水泥掺量的变化规律,应用SPSS软件拟合抗压强度和疲劳寿命关于冻融次数和水泥掺量的多因素回归方程.结果表明:冻融循环对水泥土劣化作用明显,水泥土的抗压强度和疲劳寿命随冻融次数的增加而降低,随水泥掺量的增加而增大,增加水泥掺量可有效提高水泥土的抗冻性和抗疲劳能力,且温度越低水泥土强度降低越明显.In order to study the mechanical properties of cemented soil under the freeze-thaw cycles,the variation rule of compressive strength of cemented soil with the cement content,freeze-thaw times and temperature was studied through the unconfined compressive tests,and the variation rule of fatigue life of cemented soil with the freeze-thaw times and cement content was studied through the fatigue tests.In addition,the multi-factor regression equations of compressive strength and fatigue life with the freeze-thaw times and cement content were fitted by using SPSS software.The results show that the freeze-thaw cycles have an obvious effect on the deterioration of cemented soil.The compressive strength and fatigue life of cemented soil decrease with the increase of freeze-thaw times,and increase with the increasing cement content.Through increasing the cement content,the freeze and fatigue resistance of cement soil can be effectively improved.The lower the temperature,the more obvious the cement-soil strength decreases.

关 键 词：水泥土 冻融循环 疲劳寿命 水泥掺量 抗压强度 温度 冻融次数 回归方程 

分 类 号：TU521.3[建筑科学—建筑技术科学]