摘要
渗流作用下冻结温度场的求解是一个移动边界、相变、内热源、温度场和渗流场相互影响的多场耦合问题。文章建立了无充填裂隙岩体含相变的渗流场及温度场耦合模型,采用单因素法研究了冻结管间距对渗流作用下无充填裂隙岩体冻结壁演化规律的影响。结果表明:冻结管间距对冻结壁交圈时间的影响规律符合指数函数特征,冻结管间距越大,冻结壁交圈时间越长,且增幅越大;冻结管间距越大,形成同样界面冻结壁厚度所需的冻结时间越长;冻结管间距存在一个临界值,大于该值后,界面冻结壁扩展成相同厚度所需的冻结时间随冻结管间距的增大而急剧增加;冻结管间距越大,冻结壁平均温度下降到设计温度所需冻结时间越长。
The solution of freezing temperature field under effect of seepage is a kind of multi-field coupling,and the moving boundary,phase change,internal heat source,temperature field and seepage field affect each other.A model coupled seepage and temperature with phase change of fractured rock mass without filling was established.The influence of spacing of frozen tubes on the evolution of frozen walls under the function of seepage of fractured rock mass without filling was studied by single factor method.The results show that the spacing of frozen tube and the frozen wall closure time can be fitted with an exponential function.The larger the freezing tube spacing,the longer the frozen wall closure time,the larger the increase and the longer the freezing time required to form same interface frozen wall thickness;there is a critical value for the spacing of the frozen tubes,after this value is exceeded,the freezing time required for forming the same interface frozen wall thickness increases sharply with an increase of the spacing of freezing tube,and the longer the spacing of freezing tube,the longer the freezing time required to drop the average temperature of frozen wall to the designed temperature.
作者
陈鑫
张泽
李东庆
周攀峰
张虎
CHEN Xin;ZHANG Ze;LI Dongqing;ZHOU Panfeng;ZHANG Hu(State Key Laboratory of Frozen Soil Engineering,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000;University of Chinese Academy of Sciences,Beijing 100049;School of Civil and Architectural Engineering,East China University of Technology,Nanchang 330013;Guangzhou Academy of Nuclear Engineering Investigation,Guangzhou 510800)
出处
《现代隧道技术》
EI
CSCD
北大核心
2019年第4期135-142,共8页
Modern Tunnelling Technology
基金
国家自然科学基金(41771078,41271080)
青海省交通科学研究院开放基金(2016-01-04)
关键词
裂隙岩体
渗流场
温度场
冻结管间距
冻结壁
Fractured rock mass
Seepage field
Temperature field
Freezing tube spacing
Frozen wall
