应力场中水泥-石灰改良土疲劳性能试验研究  

Experimental research on fatigue performance of cement-lime improved soil in stress field

作　　者：司文琪 张欣 高涛 王俊杰 陈其帆 王晶 赵月航 SI Wenqi;ZHANG Xin;GAO Tao;WANG Junjie;CHEN Qifan;WANG Jing;ZHAO Yuehang(School of Civil Engineering,Shandong Jiaotong University,Jinan 250357,China;Shandong Luqiao Group Co.,Ltd.,Jinan 250021,China;Shandong Provincial Communications Planning and Design Institute Group Co.,Ltd.,Jinan 250031,China;Mount Taishan Traffic Planning&Design Consulting Co.,Ltd.,Tai′an 271001,China;Shandong Binzhou Institute of Science and Technology Innovation and Development,Binzhou 256603,China)

机构地区：[1]山东交通学院交通土建工程学院,山东济南250357 [2]山东省路桥集团有限公司,山东济南250021 [3]山东省交通规划设计院集团有限公司,山东济南250031 [4]山东泰山交通规划设计咨询有限公司,山东泰安271001 [5]滨州市科技创新发展研究院,山东滨州256603

出　　处：《山东交通学院学报》2024年第3期69-76,共8页Journal of Shandong Jiaotong University

基　　金：山东省交通运输科技计划项目(2023B90)。

摘　　要：为获得改良土在不同影响因素下的疲劳性能,以水泥、石灰为胶凝材料制备改良土,通过变幅应力循环加载试验分析改良土中胶凝材料的质量分数、养护龄期、应力水平等因素对改良土的无侧限抗压强度、疲劳强度、疲劳寿命的影响,建立改良土疲劳寿命回归方程。结果表明:胶凝材料的质量分数对改良土的疲劳强度和疲劳寿命有显著影响,无侧限抗压强度随胶凝材料质量分数的增大而增大,不同养护龄期改良土的疲劳强度和疲劳寿命与胶凝材料的质量分数正相关;在不同养护龄期下,水泥土的临界循环疲劳应力比随胶凝材料质量分数的增大而减小,在相同养护龄期下,石灰土的临界循环疲劳应力比受胶凝材料质量分数的影响比水泥土小;养护龄期与水泥土疲劳强度和疲劳寿命呈指数函数关系,与石灰土疲劳强度和疲劳寿命呈二次函数关系;改良土的临界循环疲劳应力比随养护龄期的增大而减小;循环加载应力幅值和平均应力越小,改良土的疲劳寿命越长,反之,改良土的疲劳寿命越短。In order to obtain the fatigue performance of improved soil under different influencing factors,cement and lime are used as cementitious materials to prepare the improved soil.By analyzing the mass fraction of cementitious materials,curing age,stress level,and other factors in the improved soil through cyclic loading tests,the influence of these factors on the unconfined compressive strength,fatigue strength,and fatigue life of the improved soil is studied to establish a regression equation for the fatigue life of the improved soil.The results show that the mass fraction of cementitious materials has a significant impact on the fatigue failure strength and fatigue life of the improved soil.The unconfined compressive strength increases with the increase in the mass fraction of cementitious materials.The fatigue failure strength and fatigue life of the improved soil at different curing ages are positively correlated with the mass fraction of cementitious materials.For different curing ages,the critical cyclic fatigue stress ratio of cement soil decreases with the increase in the mass fraction of cementitious materials,while for lime soil at the same age,the critical cyclic fatigue stress ratio is less affected by the mass fraction of cementitious materials compared to cement soil.The relationship between curing age and the fatigue strength and fatigue life of cement soil is exponential,while for lime soil,it is quadratic.The critical cyclic fatigue stress ratio of the improved soil decreases with the increase in curing age.The fatigue life of the improved soil is longer when the stress amplitude and mean stress of cyclic loading are smaller,and vice versa,the fatigue life is shorter.

关 键 词：改良土 胶凝材料 循环荷载 疲劳性能 

分 类 号：U213.1[交通运输工程—道路与铁道工程] U416.216