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

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