路基工程Issue(4)：69-76,8.DOI:10.13379/j.issn.1003-8825.202302004
路基改良土循环加/卸载试验能量演化研究
Study on Energy Evolution of Cyclic Loading/Unloading Test of Subgrade Improved Soil
摘要
Abstract
The cyclic loading/unloading test was carried out to analyze the energy parameter transformation law of the improved soil of highway subgrade under loading.The results show that the energy conversion of subgrade improved soil under different confining pressures is similar,showing pre-peak energy accumulation,failure energy dissipation,post-peak residual strength energy re-accumulation,but the efficiency and total amount are lower than pre-peak.Confining pressure has little effect on the energy parameters of the subgrade improved soil at pre-peak,but slightly increases the effect of energy accumulation at residual strength.Before the peak,the energy consumption ratio K slowly decreases with the increase of axial strain.When the soil strength fails,the energy consumption ratio K suddenly changes.The mutational site of the energy consumption ratio K corresponds to the inflection point of stress-time curve,indicating that the energy consumption ratio can be used as the strength failure characteristic of the subgrade improved soil under cyclic loading/unloading under triaxial stress state,and can also explain the evolutionary failure law of subgrade improved soil from the perspective of energy.关键词
路基改良土/循环加/卸载/径向应变/能量演化/参数比例/强度失效判据Key words
improved soil/cyclic loading/unloading/radial strain/energy evolution/parameter proportion/criteria for strength failure分类
建筑与水利引用本文复制引用
牛洪军,张俊武,章希伦,赵嘉..路基改良土循环加/卸载试验能量演化研究[J].路基工程,2024,(4):69-76,8.基金项目
中交一公局第一工程有限公司科技创新基金(HKY22006) （HKY22006）
