秦鹏飞,王珍,邵振猛,高瑞源

• 1:黄河科技学院工学部
• 2:郑州大学土木工程学院

摘要(Abstract)：

多孔介质渗流理论广泛应用于地下水污染修复、农田水利、砂土注浆加固及石油开采等领域。基于工程渗流力学和黏性流体力学，考虑颗粒型浆液的运移滤出机制，结合浆液分区特性和线性滤过定律，建立水泥浆液在砂砾地层中的扩散模型，探索砂砾地层浆液界面速度、压力的变化机理，并结合杭州地铁工程进行分析验证。研究表明，若忽略渗滤效应，恒流速条件下浆液沿程扩散速度保持不变，恒压力条件下浆液扩散速度沿程衰减，但均大于考虑渗滤效应的砂土渗透注浆实际扩散速度。不考虑渗滤效应时，浆液在砂土中的理论扩散距离可达100 cm,实际上由于渗滤和砂层阻力作用，浆液扩散中浓度降低、速度变小，扩散至66 cm处浆液已停止流动。距离注浆孔口越近，浆液的锋面速度受渗滤效应影响越明显，浆液速度变化越剧烈。本文建立的砂砾地层扩散理论模型具有较高的适用性，可为隧道、矿业、交通等工程建设提供科学指导，有利于推动注浆技术在岩土工程不良地质加固中的应用，进而促进渗透注浆技术的高质量发展。

关键词(KeyWords)： 砂砾地层;渗透扩散;渗滤作用;压力降;防渗加固

Abstract:

Keywords:

基金项目(Foundation): 河南省自然科学基金(252300420053)

作者(Author): 秦鹏飞,王珍,邵振猛,高瑞源

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