摘要
以袁店二矿西风井井筒冻结法施工为工程背景,运用有限元软件Comsol Multiphysics,对土体导热系数进行反演;并以反演得到的导热系数,对选定层位的冻结壁温度场进行数值计算,同时分析了温度场对土体的导热系数、比热容、相变潜热与初始地温的敏感性。结果表明:现场井筒掘进至该层位时,冻结壁平均温度与厚度满足设计要求,井帮温度满足规范要求。导热系数对温度场影响明显:导热系数越大,降温速率越快,降温幅度越大。比热容对温度场影响较大:比热容越小,温降速率越快,降温幅度越大。初始地温对温度场影响较大:初始地温越低,降至相同温度所需要的冻结时间越短。相变潜热对温度场影响较小。所得结果可为类似工程提供参考。
Based on a ground freezing method construction of a west ventilation shaft in Yuandian No.2 Mine as the engineering background,finite element software Comsol Multiphysics was applied to conduct the inversion on the soil thermal conductivity coefficient.With the thermal conductivity coefficient from the inversion,a numerical calculation was conducted on the temperature field of the freezing wall in the selected layer and meanwhile an analysis was conducted on the sensitivity of the temperature field to the soil thermal conductivity,specific heat capacity,latent heat of the phase transformation and initial ground temperature.The results showed that when the site shaft sunk at the layer,the average temperature and thickness of the freezing wall could meet the design requirement and the temperature of the shaft wall could meet the specification requirement.The thermal conductivity coefficient would have obvious influences to the temperature field.The greater of the thermal conductivity coefficient was,the faster temperature decreasing rate would be and the higher temperature decreasing range would be.The specific heat capacity would have a great influence to the temperature field.The smaller of the specific heat capacity was,the faster temperature decreasing rate would be and the higher temperature decreasing range would be.The initial ground temperature would have high influences to the temperature field.The lower initial temperature was and the short freezing time required to the similar temperature would be shorter.The latent heat of the phase transition would have less influence to the temperature field.The results obtained could be the references to the similar engineering.
作者
朱世奎
龙伟
荣传新
ZHU Shikui;LONG Wei;RONG Chuanxin(Huaibei Mining Corporation Limited,Huaibei 235000,China;School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan 232001,China)
出处
《建井技术》
2020年第4期35-41,共7页
Mine Construction Technology
关键词
煤矿立井
冻结温度场
导热系数
反演
数值计算
mine shaft
freezing temperature field
thermal conductivity coefficient
inversion
numerical calculation
