摘要
气相封闭的含气泡土是一种特殊的非饱和土类型,其孔隙流体压缩性不可忽略。以小气泡概念模型假设为基础,基于理想气体变形的Bolye定律及表面张力作用等基础理论,推导分析了含封闭气泡土体孔隙混合流体的压缩系数C_(gw)不同计算公式。针对水饱和度较高时已有研究公式的不完善性,采用将溶于水的气体和水作为整体确定其压缩系数的处理思路,在此基础上提出了一种C_(gw)的计算方法,并将不同水饱和度下的计算结果与其他计算方法进行对比研究,分析了其合理性和适用性,还分析了孔隙混合流体压缩系数公式中相关参数变化规律及其对计算结果的影响。
The gassy soil containing entrapped gas bubbles is a special type of unsaturated soils, and the compressibility of air-water mixture in gassy soils cannot be ignored. Based on the conceptual model for small bubbles, the Bolye's law of ideal gas and the surface tension effects, equations of the coefficient of compressibility for air-water mixture are derived. When the saturation is higher, the existing equations are not applicable, so a new method for Cgw is proposed, which treats the water and the gas dissolved in the water as a whole. The calculated results under different water saturations are compared with those of other existing methods. The comparitive results show that the proposed method is more reasonable. Finally, the variation characteristics and the impact on the calculated results of the related parameters in the new equation are also analyzed.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2017年第S2期120-123,共4页
Chinese Journal of Geotechnical Engineering
关键词
封闭气泡
孔隙混合流体
压缩系数
entrapped gas bubble
air-water mixture
coefficient of compressibility
