摘要
采用控制变量法,通过多次冻融循环试验模拟自然环境的变化,研究多因素耦合下艾丁湖地区天然亚硫酸盐渍土的盐-冻胀规律,得出细粒亚硫酸盐渍土盐-冻胀率与变量之间的交互回归方程.根据研究结果,得出以下结论:①当亚硫酸盐渍土体处于最优含水率状态时,其盐-冻胀作用最强烈,气相孔隙和水盐运移、聚集能力决定了盐-冻胀的作用效果;②随着冻融循环次数的增加,荷载对盐-冻胀的抑制能力先减弱后增强最后逐渐趋于稳定,50kPa的上覆荷载即可减少约60%的盐-冻胀量.③含水率和上覆荷载是影响盐-冻胀作用的主要因素,同时含水率和荷载的交互作用会影响土体盐-冻胀的发展,控制含水率、增加上覆荷载,可以有效抑制天然亚硫酸盐渍土的盐-冻胀作用.
The study on the laws of salt-frost heave characteristics of Lake Ayding area’s natural sulfite saline soil under the coupling of three factors was carried out,by using the method of controlling variables,simulating the change of natural environment temperature through multiple freeze-thaw cycle tests. Then,the reciprocal regression equation between salt-frost heave ratio and variables of natural sulfite saline fine soil was achieved. The study results show as follows.①The function of salt-frost heave will reach the maximum when the soil’s water content is the optimal condition. The gas phase pore,the ability of both water-salt transport and gathering determine the effects of saltfrost heave.②With the increase if freeze-thaw cycle times,the load’s constrain ability of salt-frost heave was weakened and then strengthened and eventually reached a plateau. 50 kPa load can reduce 60% of salt-frost heave.③The dominant factors for salt-frost heave are water content and load. Also,the interaction of the two factors will affect the development of salt-frost heave. To limit the salt-frost heave of natural sulfite saline fine soil,the control of water content and increase of load could be adopted.
作者
叶鸣
潘蕾
张远芳
YE Ming;PAN Lei;ZHANG Yuanfang(Xinjiang Zhongdi Geotechnical Engineering Investigation and Designing Institute Co. Ltd.,Urumqi 830000,China;Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai University,Nanjing 210098,China;College of Hydraulic and Civil Engineering,Xinjiang Agricultural University,Urumqi 830052,China)
出处
《河南科学》
2019年第8期1276-1282,共7页
Henan Science
基金
国家自然基金项目（41262012）
关键词
天然亚硫酸盐渍土
多因素耦合
盐-冻胀
含水率
荷载
natural sulfine saline soil
multifactor coupling
salt-frost heave
water content
load
