摘要
为解决施工过程中冻结温度场难以预测的问题,基于冻结孔实际成孔位置以及土体的热物理参数,并结合测温孔数据,利用COMSOL Multiphysics软件,对临涣煤矿中央风井各层位冻结壁交圈时间及不同月进尺条件下冻结温度场的发展情况进行预测分析。结果表明:该风井不同层位冻结壁的交圈时间介于31~48 d之间,其中-65 m细砂层位冻结壁的交圈时间最短,仅为31 d;-215 m黏土层冻结壁的交圈时间最长,达到48 d。分别以85 m/月和100 m/月的速度掘进,开挖至各个层位时,冻结壁均能交圈,且平均温度均低于-17℃,均能够满足设计要求。
In order to solve the engineering problem that the freezing temperature field was difficult to predict,based on the actual position of freezing holes and the thermal physical parameters of soil,combined with the data of temperature measuring holes,the closure time of frozen wall and development law of freezing temperature field under different monthly drawing scale at different layers of central ventilation shaft of Linhuan coal mine was predicted and analyzed by COMSOL Multiphysics software.The prediction results showed that the closure time of the frozen wall in different layers of the central ventilation shaft of Linhuan coal mine was between 31 and 48 days.Among them,the closure time of frozen wall in-65 m fine sand layer was the shortest,only 31 days;the closure time of frozen wall in-215 m clay layer was the longest,reaching 48 days.At the speed of monthly 85 m and 100 m respectively,when the excavation reached each layer,the frozen wall could intersect with the circle,and the average temperature of both was lower than-17℃,which showed that both conditions could meet the design requirements.
作者
周为军
吴洋
荣传新
王彬
ZHOU Weijun;WU Yang;RONG Chuanxin;WANG Bin(Linhuan coal mine,Huaibei Mining Group,Huaibei 235136,China;School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan 232001,China)
出处
《建井技术》
2022年第4期43-48,共6页
Mine Construction Technology
基金
国家自然科学基金资助项目(51878005)。
关键词
人工地层冻结法
冻结壁
冻结交圈时间
数值计算
预测分析
artificial ground freezing
frozen wall
freezing closure time
numerical calculation
forecast analysis
