摘要
数值模拟是研究浆液在岩体裂隙中扩散规律的重要途径之一。对浆液运动界面进行准确地追踪,是建立浆液流动扩散仿真分析方法需要解决的一个关键问题。以自膨胀浆液在平板裂隙中流动扩散过程为对象,考虑浆液扩散过程中两相流特征,引入VOF函数描述两相介质分布,采用基于几何学原理的Youngs方法求解VOF方程,以实现对浆液移动界面的追踪。利用已知密度随时间变化规律的自膨胀浆液在平板裂隙中自由扩散算例对该方法进行测试,结果表明,不同时刻求解得到的浆液移动界面位置和轮廓与解析解吻合较好,显示了较高的计算精度和良好的界面追踪效果,为开发自膨胀浆液流动扩散仿真程序奠定了基础。
Numerical simulation is the most efficient way to investigate the mechanism of grout diffusion in jointed rocks, but one of the most critical challenges is to accurately track the grout flow in numerical simulation. This study was focused on the diffusion process of self-expanding grout in the flat fracture surface and considering characteristics of two-phase flow in the grout diffusing. Moreover, the VOF function was employed to describe the distribution of two-phase medium, and then was solved by Youngs method based on the principle of geometry. Thus, the tracking of grout moving interface was realised. Finally, the proposed method was examined by an example of the self-expanding grout with a known density freely diffusing with time in a plat fracture surface. The results showed that the analytical solutions were in good agreements with obtained locations and contours of the grout moving interface at different times in the example. Hence, the results verified that the proposed method had a high calculation precision and exhibited a sound effect of interface tracking. This study lays a solid foundation for developing the numerical method for simulating the diffusion processes of self-expanding grout flow.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2017年第12期3491-3497,3504,共8页
Rock and Soil Mechanics
基金
国家重点研发计划(No.2016YFC0802207)
NSFC-河南人才培养联合基金(No.U1404525)
国家自然科学基金(No.51378473)
河南省高等学校重点科研项目(No.18A580001)~~
