摘要
建立了渗流作用下裂隙岩体双孔冻结的数值计算模型,采用COMSOL Multiphysics有限元分析软件,实现了裂隙岩体冻结过程中耦合及相变问题的模拟,分析了裂隙存在对岩体冻结温度场及渗流场的影响,研究了不同渗流速度下对应的冻结温度场的分布规律。结果表明:裂隙的存在会减薄上游冻结壁厚度,等温线在冻结壁外圈形成"心形"分布;渗流速度对冻结壁的发育及其交圈时间影响较大,渗流速度愈大,冻结壁发育愈慢,交圈时间愈长。在本文条件下,当渗流速度小于7 m/d时,流速与交圈时间基本呈线性关系;当渗流速度超过7 m/d时,交圈时间呈现急剧增长,达到10 m/d时,交圈时间趋于无限大,即交不上圈。
A numerical calculation model of fractured rock mass artificial seepage freezing with two holes was set up, and the problem of coupling and phase change during the freezing process were simulated by using the COMSOL Multiphysics finite-element analysis software. The influence of the fracture on the distribution of freezing temperature field and seepage field was analyzed. The distribu- tion law of freezing temperature field corresponding to the different flow velocities was researched. The results show that the existence of fracture reduces the thickness of the frozen wall in the upstream, and the isotherms outside the frozen wall show ＂heart-shaped＂ distribution. The seepage velocity has a great influence on both the frozen wall development and the closure time. If the seepage velocity is increas- ing, the development of freezing wall will become slower and the closure time will become longer ac- cordingly. In this paper, when the seepage velocity is less than 7 m/d, the closure time shows a linear relationship with the seepage velocity basically. But when the seepage velocity is more than 7 m/d, the closure time mount up sharply, the closure time tends to be infinite once the velocity exceeds 10 m/d, namely reach the unable closure stage.
出处
《采矿与安全工程学报》
EI
北大核心
2013年第1期68-73,共6页
Journal of Mining & Safety Engineering
基金
国家重点基础研究发展计划(973)项目(2010CB226800)
国家自然科学基金重点项目(50834004)
中国博士后科学基金面上项目(2011M500968)
关键词
冻结温度场
渗流
裂隙岩体
冻结壁
交圈时间
freezing temperature field
seepage
the fractured rock mass
freezing wall
closure time
