地下水作用下人工地层冻结过程中“群管效应”的影响规律研究  

Study on the triggering mechanism of the“group pipe effect”in the freezing process of artificial strata under the action of groundwater

作　　者：苗思伟 王彬[1,2,3] 赵宗 张子浩 梁秀玲 MIAO Siwei;WANG Bin;ZHAO Zong;ZHANG Zihao;LIANG Xiuling(School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan 232001,China;Postdoctoral Research Station of China Coal Mine Construction Group,Hefei 230091,China;Ministry of Education Engineering Research Centre for Mining Underground Engineering,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 [2]中煤矿山建设集团有限责任公司博士后科研工作站,安徽合肥230091 [3]安徽理工大学矿山地下工程教育部工程研究中心,安徽淮南232001

出　　处：《建井技术》2025年第1期59-71,共13页Mine Construction Technology

基　　金：国家自然科学基金项目(52378384);安徽省自然科学基金项目(2308085ME188);安徽省博士后科学基金(2022B635);河南省地下工程与灾害防控重点实验室开放基金(KFKT 2023-06)。

摘　　要：为探究地下水渗流作用下不同布管方式的冻结温度场时空演化规律,基于多孔介质传热和渗流理论,构建不同布管方式下的渗流数值计算模型,对不同流速条件下的人工地层冻结过程中“群管效应”触发机制进行数值模拟研究。结果表明:当地下水流速为0 m/d和5 m/d时,双管冻结壁交圈时间分别为93、273 h,而流速继续增大则导致冻结壁无法交圈。在不同地下水流速条件下,各工况冻结帷幕向下游扩展面积随着流速的增大逐渐减小,表明水流对流传热作用增强导致冻结锋面扩展速率减慢。当冻结时间达到400 h时,在渗流速度为0、5、7、9 m/d作用下四管冻结帷幕向下游的扩展距离分别为783、765、745、730 mm。相比三管工况一和工况二分别增大8.90%、17.32%、19.83%、20.01%和20.17%、26.14%、27.11%、29.86%。对冻结过程分析发现,增大地下水流速,会推迟交圈时间,但通过合理配置冻结管数量和布局,可以触发多管协同作用而产生的“群管效应”,该效应会加快冻结锋面的扩展速度,缩短冻结壁交圈时间,更加高效地实现冻结目标,提高工程的安全性和稳定性。In order to investigate the spatial and temporal evolution of the freezing temperature field in different piping methods under the action of groundwater seepage,based on the theory of heat transfer and seepage in porous media,we constructed numerical computational models of seepage in different piping methods,and carried out numerical simulation research on the triggering mechanism of the“group piping effect”during the freezing process of an artificial stratum under the conditions of different flow velocities.The results show that when the groundwater flow rate is 0 and 5m/d,the freezing time of the double-pipe freezing wall is 93 and 273 h,respectively,and the freezing wall cannot be interlocked when the flow rate continues to increase.Under different groundwater flow rate conditions,the downstream expansion area of the freezing curtain for each condition decreases gradually with the increase of flow rate,indicating that the enhancement of convective heat transfer by water flow leads to the slowing down of the expansion rate of the freezing front.When the freezing time reaches 400 h,the expansion distance of the freezing curtain to the downstream of the four pipes under the seepage velocity of 0,5,7,9 m/d is 783 mm,765 mm,745 mm,730 mm,respectively,which is increased by 8.90%,17.32%,19.83%,20.01%,20.17%,26.14%compared with the three-pipe working conditions I and II,respectively,27.11%,29.86%,the analysis of the freezing process found that increasing the groundwater flow rate will delay the intersection time,but through the reasonable configuration of the number of freezing tubes and the layout,it can trigger the“group tube effect”generated by the synergistic action of multiple tubes,which will accelerate the expansion of the freezing front,shorten the intersection time of the freezing wall,and achieve the freezing target more efficiently.This effect will speed up the expansion of the freezing front,shorten the intersection time of the freezing wall,achieve the freezing target more efficiently and improve

关 键 词：人工地层冻结 群管效应 地下水流速 冻结温度场 触发机制 

分 类 号：TD265.33[矿业工程—矿井建设]