煤矿立井井筒双圈管冻结不同地层冻结效果研究  

Research on freezing effect of different formations with double-coiled pipe freezing in coal mine shaft

作　　者：刘稳 倪贤 Liu Wen;Ni Xian(School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan 232001,China)

机构地区：[1]安徽理工大学土木建筑学院,安徽淮南232001

出　　处：《山西建筑》2021年第1期82-85,共4页Shanxi Architecture

摘　　要：以淮北某矿副井立井井筒双圈管冻结为工程实例,基于现场冻结孔实际成孔位置,选取现场细砂、粘土和钙质粘土三种不同土性的地层为研究对象,利用有限元数值计算软件COMSOL MULTIPHYSICS研究三种不同土性地层的冻结效果。研究结果表明:细砂层位冻结壁先交圈,粘土层位次之,钙质粘土层位最后交圈;冻结壁交圈以后,细砂层位冻结壁平均扩展速率最快,约为3.30 cm/d,粘土层位次之,约为2.73 cm/d,钙质粘土最慢,约为2.67 cm/d;冻结相同时间时,钙质粘土层位冻结壁平均温度最低,粘土层位次之,细砂层位最高。研究结果可为类似冻结工程分析冻结壁温度场发展情况以及确定加强冻结方面提供参考。Taking the double-coiled pipe freezing of the auxiliary shaft of a mine in Huaibei as an engineering example,based on the actual hole formation position of the on-site freezing hole,three different soil layers of fine sand,clay and calcareous clay are selected as the research objects,and finite element values are used the calculation software COMSOL MULTIPHYSICS studies the freezing effect of three different soil formations.The research results show that the frozen wall in the fine sand layer intersects first,the clay layer is second,and the calcareous clay layer intersects last,after the frozen wall intersects,the average expansion rate of the frozen wall in the fine sand layer is the fastest,about 3.30 cm/d,the clay layer is second,about 2.73 cm/d,and the calcareous clay is the slowest,about 2.67 cm/d,when frozen for the same time,the average temperature of the frozen wall of the calcareous clay layer is the lowest,and the clay layer is the second.However,the level of fine sand is the highest.The research results can provide a reference for similar freezing projects to analyze the development of the freezing wall temperature field and determine the enhancement of freezing.

关 键 词：立井井筒 多圈管冻结 冻结壁 数值计算 

分 类 号：TD265.3[矿业工程—矿井建设]