周中;胡江锋;刘撞撞;鲁四平;

• 1:中南大学土木工程学院

摘要(Abstract)：

为探究盾构隧道壁后注浆浆液在围岩内的渗透扩散行为，基于达西定律和流体力学，建立考虑与不考虑黏度时变性的浆液渗透扩散方程，并根据弹性力学原理，推导渗透压力作用下围岩的径向有效应力、切向有效应力和径向位移的计算方程；基于长沙地铁4号线盾构施工实测数据，借助Matlab软件对方程进行计算分析，提出壁后注浆对围岩的影响机理。结果表明：壁后注浆浆液在围岩中的扩散半径随注浆压力和注浆时间的增加而增大；当考虑浆液的黏度时变性时，浆液扩散半径会缩小，特别是在长注浆时间（40 min）情况下，浆液的扩散半径相对于不考虑黏度时变性时缩小34.9%；随着注浆压力的增大，渗透区土体的径向有效应力增大，切向有效应力减小，且随着围岩距隧道中心距离的增加，最终均趋于原位围岩有效应力；壁后注浆渗透压力使围岩产生的径向压缩变形量随注浆压力的增大而增大，当注浆压力为0.42 MPa时，围岩内部最大位移达7.81 mm。

关键词(KeyWords)： 盾构隧道;壁后注浆;渗透压力;扩散半径;黏度时变性

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金资助项目（50908234）;; 湖南省自然科学基金资助项目（2020JJ4743）

作者(Authors): 周中;胡江锋;刘撞撞;鲁四平;

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