深厚覆土地区多层含水层水位升降对井筒稳定性影响研究  

Influence of water level fluctuation of multi-layer aquifer on wellbore stability in deep overburden area

作　　者：齐文涛 刘中原 刘洪建 常素玲[1] 张黎明[2] 丛宇[2] 王在泉[1] QI Wentao;LIU Zhongyuan;LIU Hongjian;CHANG Suling;ZHANG Liming;CONG Yu;WANG Zaiquan(School of Science,Qingdao University of Technology,Qingdao 266525,China;School of Civil Engineering,Qingdao University of Technology,Qingdao 266525,China)

机构地区：[1]青岛理工大学理学院,青岛266525 [2]青岛理工大学土木工程学院,青岛266525

出　　处：《青岛理工大学学报》2023年第4期10-18,共9页Journal of Qingdao University of Technology

基　　金：山东省自然科学基金资助项目(ZR2020ME099)。

摘　　要：针对多层含水层水位升降影响井筒稳定性研究的不足,采用数值模拟方法分析不同埋深含水层降水顺序对井筒稳定性的影响。结果发现:多层含水层按不同顺序降水时,埋深大的含水层先降水、埋深小的含水层后降水工况对井筒稳定性最不利;不同埋深的含水层同时降水对井筒不利影响次之;埋深小的含水层先降水、埋深大的含水层后降水工况对井筒稳定性的不利影响最小。发生降水的含水层沉降值远大于相邻土层沉降值,土层与井筒之间的沉降差转化为土体作用给井筒向下的竖向附加应力,当附加应力达到井筒极限强度时造成井筒破坏。研究结果对煤矿井筒疏水方案设计有重要的参考价值。Due to the deficiency of the research on the influence of water level fluctuation of multi-layer aquifer on wellbore stability,numerical simulation method is used to analyze the effect of precipitation sequence on the wellbore stability in different buried aquifers.The results show that precipitation of multi-layer aquifers in different order leads to different effect.When the deep aquifer is dewatering first and the shallow aquifer is dewatering after the deep aquifer,it is most unfavorable to the stability of wellbore.When aquifers with different burial depths precipitate simultaneously,it is less unfavorable to the stability of the wellbore.And when shallow aquifer is dewatering first and deep aquifer is dewatering afterwards,it has the least adverse effect on wellbore stability.Precipitation of the aquifer is much larger than the surrounding soil layer.At the same time,the different settlement between the soil layer and the shaft wall causes the soil action to exert additional vertical stress on the wellbore,and when the additional stress reaches the ultimate intensity,the wellbore will be destroyed.The research results have important reference value for coal mine wellbore drainage scheme design.

关 键 词：井筒 含水层 降水 数值模拟 

分 类 号：TD321[矿业工程—矿井建设]