干湿冻融耦合作用下碱渣固化轻质土动力特性研究  

DYNAMIC CHARACTERISTICS OF ALKALI SLAG CURED LIGHT WEIGHT SOIL UNDER ACTION OF DRY AND WET FREEZING AND THAWING

作　　者：杨爱武 王斌彬 姜帅 YANG Aiwu;WANG Binbin;JIANG Shuai(College of Environmental Science and Engineering,Donghua University,Shanghai 201620,China;Tianjin Key Laboratory of Soft Soil Characteristics and Engineering Environment,Tianjin Chengjian University,Tianjin 300384,China)

机构地区：[1]东华大学,环境科学与工程学院,上海201620 [2]天津城建大学,天津市软土特性与工程环境重点实验室,天津300384

出　　处：《工程地质学报》2022年第6期1962-1973,共12页Journal of Engineering Geology

基　　金：国家自然科学基金(资助号:51978440);天津市科技计划项目(资助号:19JCZDJC39700,19JCQNJC06900)。

摘　　要：为研究复杂气候条件对碱渣固化轻质土动力特性的影响,针对碱渣固化轻质土开展了干湿冻融耦合作用下的动三轴试验。试验结果表明:碱渣固化轻质土累积应变曲线展示出3种不同形态,即稳定型、临界型和破坏型;固化土轴向应变随着干湿冻融耦合次数的增加和冻结温度的下降而增大,其中前3次的影响较大,在5次以后基本达到稳定;根据固化土轴向应变规律,建立了累积动应变预测模型;随着冻结温度的降低,碱渣固化轻质土动强度逐渐减小,减小趋势先快后慢,最终趋于稳定;并且随着干湿冻融循环次数增加而减小,动强度减小速率先快后慢,前3次的动强度减小量较大,5次之后变化量较小;结合动强度的发展规律,提出干湿冻融耦合次数、冻结温度与动强度的关系式,可在工程实际应用中提供一定意义上的理论指导。This paper aims to study the effect of complex climatic conditions on the dynamic properties of alkali slag cured lightweight soils.Dynamic triaxial tests were conducted for alkali slag cured lightweight soils under the action of dry and wet freeze-thaw coupling.The test results show the follows.The cumulative strain curve of alkali slag cured lightweight soil exhibits three different forms,i.e.,stable,critical and destructive.The axial strain of cured soil increases with the increase of the number of dry and wet freeze-thaw coupling and the decrease of the freezing temperature,among which the effect of the first three times is greater,and basically reaches stability after five times.According to the axial strain law of cured soil,the cumulative dynamic strain prediction model is established.With the decrease of the freezing temperature,the dynamic strength of alkali slag cured lightweight soil gradually decreases.As the freezing temperature decreases,the dynamic strength of alkali slag cured lightweight soil gradually decreases,and the trend of decrease is faster and then slower,and finally stabilizes.With the increase of the number of wet and dry freeze-thaw cycles,the rate of decrease of dynamic strength is faster and then slower,and the decrease of dynamic strength is larger in the first three times,and the change is smaller after five times.Combined with the development law of dynamic strength,the relationship among the number of wet and dry freeze-thaw coupling,freezing temperature and dynamic strength is proposed,which can provide some theoretical guidance in the practical application of engineering.This paper provides some theoretical guidance in practical engineering applications.

关 键 词：碱渣固化轻质土 干湿冻融耦合循环 动三轴试验 动力特性 

分 类 号：TU435[建筑科学—岩土工程]