摘要
紫色土富含钙、磷、钾等矿物质,具有一定的膨胀性.为掌握紫色土在湿干循环作用下对孔隙分布的影响,本文制备了1.5g/cm3、1.7g/cm3两种干密度试样进行湿干循环5次,取循环前、第3次和第5次循环后的试样进行液氮冻干和压汞试验,进而得到其孔隙分布特征.结果表明,湿干循环会加速裂隙的发展,但循环5次后趋于稳定;不同干密度试样在d<10μm范围内的孔隙稳定性较差,干密度大的试样,其孔径将向小孔径范围发展.研究结果可为三峡库区边坡稳定性的研究提供理论参考.
Purple soil is rich in minerals such as calcium,phosphorus and potassium,with a certain degree of expansion.In order to grasp the effect of purple soil on pore distribution under the action of wet-dry circulation,two dry density samples of 1.5 g/cm^3 and 1.7 g/cm^3 are prepared for wet-dry cycle five times;before,third and fifth cycle samples are taken for liquid nitrogen lyophilization and mercury injection tests to obtain pore distribution characteristics.The results show that the wet-dry circulation will accelerate the development of cracks;but the process will reach a stable stage after five cycles.Different dry density samples have poor pore stability in the range of d<10μm;when dry density is high,the pore diameter of the sample will develop to a small pore range.The results provide a theoretical reference for the study of slope stability in the Three Gorges Reservoir area.
作者
张言
张华
黄亮
张英莹
朱潇钰
Zhang Yan;Zhang Hua;Huang Liang;Zhang Yingying;Zhu Xiaoyu(Key Laboratory of Geological Hazards on Three Gorges Reservoir Area of Ministry of Education,China Three Gorges Univ.,Yichang 443002,China)
出处
《三峡大学学报（自然科学版）》
CAS
北大核心
2019年第1期38-41,共4页
Journal of China Three Gorges University：Natural Sciences
基金
国家自然科学基金(51178251)
关键词
紫色土
湿干循环
液氮冻干
压汞
微观孔径
purple soil
wet-dry circulation
lyophilization of liquid nitrogen
mercury injection
microscopic pore diameter
