摘要
为了解决井筒开挖过程中冻结壁稳定性难以预测的问题,现以丁集矿第二副井井筒为工程背景。基于数值模拟有限元软件,利用冻土本构关系及蠕变参数,对不同冻结壁温度、不同冻结壁厚度和不同掘进段高穿过深厚冲积层(400m以下)的冻结壁进行了有限元分析。结果表明进行掘进开挖时掘进工作面会产生严重的底鼓现象,且底鼓现象会随着冻结壁温度的降低而减小,随着掘进段高、冻结壁厚度的增大而增大;同时空帮段会产生径向位移,且井帮径向位移随冻结壁温度降低、冻结壁厚度增大而减小,随着掘进段高的增大而增大;并得出了冻结壁井帮的最大径向位移、掘进工作面底鼓位移与冻结壁厚度、冻结壁温度、掘进段高和开挖段井帮暴露时间关系表达式,并根据工程实测得到了验证。为今后相似的井筒开挖提供了一定的参考价值。
To address freeze wall stability uncertainties during wellbore excavation,this study focuses on the second shaft of the Dingji Mine.Utilizing finite element analysis with frozen soil constitutive relationships,varying freeze wall temperatures,thicknesses,and depths below 400m were examined.Results reveal severe bottom heave during excavation,diminishing with lower freeze wall temperatures but increasing with excavation section height and freeze wall thickness.Radial displacement in the open section occurs,decreasing with lower freeze wall temperatures and increasing freeze wall thickness,while increasing with excavation section height.Derived expressions link freeze wall wellbore displacement,excavation face heave,and freeze wall characteristics,validated by field measurements,offering valuable insights for future similar wellbore excavations.
作者
单邓涛
王晓健
江文辉
SHAN Dengtao;WANG Xiaojian;JIANG Wenhui(School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan Anhui 232001,China)
出处
《佳木斯大学学报（自然科学版）》
CAS
2024年第4期97-101,共5页
Journal of Jiamusi University：Natural Science Edition
基金
国家自然科学基金项目(51874005)。
关键词
数值模拟
冻结壁稳定性
井帮蠕变
掘进底鼓
numerical simulation
frozen wall stability
wellbore creep
excavation bottom heave
