冻结管布置形式对冻结壁温度场发展规律影响研究  

Study on influence of freezing tubes layout on development law of temperature field of freezing wall

作　　者：王鹏 林斌[1] 侯海杰 龙依 WANG Peng;LIN Bin;HOU Haijie;LONG Yi(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

出　　处：《煤炭科学技术》2019年第12期38-44,共7页Coal Science and Technology

基　　金：高校博士点专项基金资助项目(200803610004)

摘　　要：淮南矿区煤矿立井凿井工程一般采用人工冻结法施工,根据对许多煤矿立井冻结设计方案分析,人工冻结法施工冻结管圈数越少圈径越小,冻结锋面半径和冻结壁有效厚度也越小,对于井筒净直径较小的风井,单圈管冻结设计方案即可满足设计要求,对于地质条件较为复杂,井筒净直径较大、深度较深的主井和副井,单圈管设计方案已不能满足设计要求,必须采用两圈管甚至三圈管冻结设计方案,而冻结设计方案中冻结管的布置位置又是关系工程成本和成败的因素之一。为了研究深厚黏土层冻结管不同布置形式对冻结壁温度场发展规律的影响,采用了FLAC3D软件数值模拟两圈冻结管和三圈冻结管对冻结壁温度场发展规律的影响,并将三圈管冻结壁数值模拟结果与现场实测数据对比验证。结果表明:与两圈管冻结壁相比,三圈管冻结壁冷量叠加效果更好,交圈时间更早,内圈管交圈时间提前14~21 d,冻结锋面扩展速度较快,缩短了冻结时间,形成了更厚的冻结壁和更低的冻结壁平均温度,冻结壁平均温度随冻结时间的延长近似呈对数关系降低,冻结壁有效厚度随冻结时间的延长近似呈对数关系增长,主界面温度场曲线在冻结管处近似呈V形发展,逐渐由马鞍形转变为梯形分布,主界面温度随冻结时间的延长逐渐降低,三圈管数值模拟值与实测值基本一致,对比分析验证了数值模拟的可行性。The coal mine vertical shaft sinking project in Huainan mining area is generally constructed by artificial freezing method.According to the analysis of many mine shaft freezing design schemes,the fewer number of frozen piping rings in the artificial freezing method,the smaller circle diameter,the smaller radius of the frozen front surface.For vertical wells such as wind shafts with a small net diameter of the wellbore,single-tube freezing design can meet design requirements.For the main and auxiliary wells with complex geological conditions and large net diameter and deep depth,single-tube design can no longer meet design requirements,the design scheme of the two-ring tube or even the three-ring tube must be used.The layout position of the freezing tube in the freezing design scheme is one of the factors related to the engineering cost and success or failure.In order to study the influence of different layouts of deep clay layer on the development of freezing wall temperature field,FLAC3D software was used to numerically simulate the influence of two-ring freezing tube and three-ring freezing tube on the development law of freezing wall temperature field,and simulation results of the three-loop tubes are compared with measured data.The research results show that compared with the frozen wall of two-ting tubes,the cooling effect of the frozen wall of the three-ring tube is better,the time of the circle is earlier,and the time of inner tube is 14~21 days earlier.The expansion speed of the frozen front is faster and shorter,the larger freezing wall thickness and lower freezing wall average temperature are formed.The average temperature of the frozen wall decreases approximately logarithmically with the extension of the freezing time.The effective thickness of the frozen wall is approximately logarithmic with the extension of the freezing time.As the relationship grows,the temperature field curve of the main interface develops in a V-shape in the freezing tube and gradually changes from saddle shape to trapezoidal di

关 键 词：冻结法凿井 冻结管 冻结壁温度场 两圈管 三圈管 

分 类 号：TD262[矿业工程—矿井建设]