摘要
管涌模拟是数值计算的难点。常规有限元方法难以描述管涌的客观物理过程,且在理论上不够严密;离散元方法计算工作量过大,不具有实用性。在未发生管涌的区域用常规渗流理论计算,在管涌通道区域用管流理论,这种渗流–管流耦合的方法能够较好符合管涌的发展规律,同时不会过分增加计算工作量,是一种比较实用的方法。在该方法基础上,引入土的粒径级配曲线,提出了模拟管涌通道随时间发展变化的计算方法。对有防渗墙地基的管涌发展过程模拟表明,在通道发展的开始阶段,进展速度比较缓慢,一旦达到防渗墙底部,发展速度就会大大加快,即存在前慢后快的特点。表明防渗墙不仅能够改变管涌发展方向,而且能够减小管涌发展速度,给抢险赢得时间。
It is difficult for engineers to numerically simulate the piping process.The conventional finite element method is inappropriate and not theoretically rigorous,while the discrete element method is time consuming and not suitable for practical application.By using the hydraulic theory for pipe flow and conventional seepage theory in the rest,the seepage-pipe flow coupled method can appropriately simulate the advancing pattern of the piping at smaller computational cost.Based on the coupled method and the introduction of particle size distribution,an approach to simulate the piping channel development over time is proposed.Simulation of piping in foundation with a cut-off wall shows that the progression rate is rather slow at the beginning and acceleratingly increases when the piping channel reaches the bottom level of the cut-off wall.The investigation implies that the cut-off wall changes the direction of piping channel progression and reduces the pace of development,which may be beneficial to treating dangerous situations.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2011年第2期215-219,共5页
Chinese Journal of Geotechnical Engineering
基金
国家自然科学基金项目(51039003)
国家重点基础研究发展计划(973)项目(2010CB732103
2007CB714102)
关键词
渗透变形
管涌
粒径级配曲线
防渗墙
渗流
seepage deformation
piping
particle size distribution
cut-off wall
seepage
