摘要
为研究膨胀土裂隙的产生及闭合规律,对重塑膨胀土进行了无约束条件下的3次湿干循环试验;再对湿干循环后的裂隙膨胀土进行了控制围压和偏应力为常数的CT–三轴浸水试验。研究结果表明:无约束条件下的膨胀土试样增湿和干燥都能引发裂隙的产生和闭合;在三轴浸水试验中,裂隙均趋于闭合,而闭合程度与应力状态有关;浸水过程中,试样体积变化可分为3个阶段,体积首先减小,接着因湿胀作用逐渐增大,尔后又因膨胀力释放和模量降低而减小;定义了结构修复参数,提出了三轴浸水过程中的土样结构修复演化方程。
In order to study the production and closure rules of cracks of expansive soils, tests of wetting and 4rying cycles are carried out for remolded expansive soils under non-confined condition,and CT triaxial soaking tests under certain confining pressure and deviatoric stress are then conducted. The results indicate that both the wetting and the drying of expansive soils can induce the production and closure of the cracks. In the triaxial soaking tests, the cracks tend to close, and the closure degree relates with the stress condition. During the soaking process, there are three distinct phases of volumetric change of samples, which decrease firstly, then increase rapidly under swell effect, and finally decrease with the release of expansive force and the reduction of modulus. Structural repair parameters are defined, and the evolution equation of structural repair in the triaxial soaking tests is proposed.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2010年第1期68-76,共9页
Chinese Journal of Geotechnical Engineering
基金
国家自然科学基金项目(10672182
10902091)
重庆市自然科学基金项目(2009BB8114)
后勤工程学院研究生创新基金项目(2007)
关键词
重塑膨胀土
湿干循环
CT-三轴浸水试验
结构修复演化方程
remolded expansive soils
wetting and drying cycle
CT-triaxial soaking test
evolution equation of structure repair
