摘要
季冻区公路水泥土路基在历年冻融循环作用下,常发生翻浆、冻胀现象威胁道路行驶安全。为了研究冻融循环作用下水泥土变形破坏全过程,根据弹性模量衰减规律定义冻融损伤变量,假设受荷损伤微元强度服从Weibull概率密度分布,得到受荷损伤变量,从水泥土受荷微单元和冻融微单元之间的关系出发,构建冻融、受荷总损伤变量。引入损伤修正因子,建立新的冻融循环作用下的水泥土统计损伤模型,基于试验成果和线性回归曲线拟合法,求取模型参数。开展不同冻融循环次数下的水泥土三轴压缩试验,分析损伤累积规律,利用所建模型辨识水泥土试验数据,证明所建模型的合理性和可行性。研究成果为冻融循环作用下水泥土力学行为模拟和季冻区公路路基设计、施工及养护提供一定参考。
Under the action of freeze-thaw cycle,the cement-soil subgrade in the season frozen area often occurs the phenomenon of overturning and frost heaving,which threatens the road safety.According to the law of attenuation of elastic modulus,freeze-thaw damage variables were defined,assuming that the strength of the loaded damage microelement follows the Weibull probability density distribution,and the load damage variables were obtained.Based on the relationship between the loaded microelement and the freeze-thaw microelement of cement soil,the total damage variables of freeze-thaw and load were constructed.The damage correction factor was introduced to establish a new statistical damage model of cement soil under freeze-thaw cycle.Based on the experimental results and linear regression curve fitting method,the model parameters were obtained.The triaxial compression test of cement soil under different freeze-thaw cycles was carried out to analyze the law of damage accumulation,and the test data of cement soil were identified by using the model to prove the rationality and feasibility of the model.The research results provide some reference for the simulation of mechanical behavior of cement soil under freeze-thaw cycle and the design,construction and maintenance of highway subgrade in seasonal freezing area.
作者
苏艳军
SU Yan-jun(China Architecture Northeast Design and Research Institute Co., Ltd.,Shenyang 110166, China)
出处
《科学技术与工程》
北大核心
2022年第10期4113-4119,共7页
Science Technology and Engineering
基金
中建股份科技研发计划(CSCEC-2017-Z-37,CSCEC-2018-Z-23)。
关键词
季冻区
冻融循环
水泥土
统计损伤
微元强度
seasonal freezing zone
freeze-thaw cycle
cement soil
statistical damage
micro element strength
