重庆大学学报2018，Vol.41Issue(4)：71-79,9.DOI:10.11835/j.issn.1000-582X.2018.04.009
硬石膏膨胀特性及其湿度应力场膨胀本构模型
The swelling properties of anhydrite and its himidity-stress-field swelling constitutive model
摘要
Abstract
The anhydrite rock swells obviously when it's exposed to water,and the non-uniform dynamic distribution of groundwater leads to uneven expansion of surrounding rock.We take the anhydrite rock in Lirang tunnel,Liangzhong highway,as the research object,and set different initial water amount to carry out the anhydrite confined swelling experiment with using the consolidometer,which aims at figuring out the change rules of water absorption,swelling strain and confined swelling stress of the anhydrite rock.The results show that the water absorption rate of anhydrite increases rapidly at first and then slowly.The water absorbed by anhydrite in the process of rapid growth is mainly converted to crystal water,and in the slowly growth process,the free water inside the anhydrite gradually increases.The swelling strain and swelling stress of anhydrite increase with the increase of soaking water.When the soaking water volume is one-fourth of the theoretical water consumption of complete gypsification,it reaches the turning point where the growth rates of swelling strain and stress significantly decrease.The water absorption of anhydrite rock has a time effect,and there is a negative exponent relation between water absorption and time.Based on it,combined with the humidity stress field theory,the anhydrite time-dependent constitutive is obtained.关键词
硬石膏/侧限膨胀/岩水比/时间效应/吸水率Key words
anhydrite/confined swelling/rock to water ratio/time-dependent effect/bibulous rate分类
交通工程引用本文复制引用
任松,欧阳汛,姜德义,吴建勋,陈结..硬石膏膨胀特性及其湿度应力场膨胀本构模型[J].重庆大学学报,2018,41(4):71-79,9.基金项目
国家自然科学基金资助项目(51774057) （51774057）
重庆市研究生科研创新项目(CYB17046).Supported by National Natural Science Foundation of China(51774057) and the Postgraduates Innovation Fund of Chongqing University (CYB17046). （CYB17046）
