Abstract: In order to solve the problem of water-rich loess tunnel in construction process, based on the idea of underground water environmental balance, the Kuniaki Sato empirical formula and underground runoff modulus was used to build correlation function and get the permeability coefficient. Combining the engineering practice condition of the Qiaoyuan tunnel, the duplex pipe grouting was used to reinforce the water-rich loess tunnel, and its grouting effect was also evaluated in detail. Results show that there are a lot of obvious grouting veins on tunnel face, and the bedding is clear. There is not bleeding phenomenon on tunnel face. The surrounding rock is stable, no such phenomena occur as collapse, instability, gushing water or mud, etc. The soil strength increases dramatically, and the permeability reduces significantly. The permeability coefficient of grouting soil meets the requirements of underground water environmental balance.

Key words: tunnel engineering, idea of underground water environmental balance, water-rich loess tunnel, grouting pre-reinforcement mechanism, effect evaluation

摘要： 为解决富水黄土隧道在施工过程中出现的各种病害，基于地下水平衡理念，利用佐藤邦明法及地下径流模数法建立关联函数，得出地下水平衡时所需的注浆体渗透系数，并结合乔原隧道的工程实际情况，利用二重管无收缩双液注浆加固技术对富水黄土地层进行注浆加固，并对注浆效果进行了详细评价。结果表明：掌子面土体含有大量浆脉，其分布层理清晰，掌子面土体未出现泌水现象，土体稳定性较好，未发生掉块、塌方、涌水、突泥等病害，且土体强度有大幅提升，渗透性有大幅降低，注浆体渗透系数满足地下水平衡的要求。

关键词: 隧道工程, 地下水平衡理念, 富水黄土隧道, 注浆加固机制, 效果评价