Abstract: In order to study the variation law of lining stress caused by crystallization clogging of tunnel drains at different water levels, the variation law of lining stress under 5 kinds of blocking conditions and 4 kinds of groundwater level conditions was studied by simulating the blockage of drainage pipes with the method of “replacing holes with plates”. The results show that: the variation law of tunnel lining stress under different blocking conditions and different water level conditions is consistent. Under the same degree of blockage, with the increase of the original groundwater level, the tunnel lining stress increases, the maximum principal stress difference between the left and right arch foot of the tunnel increases, and the minimum principal stress difference decreases. Under the same water level condition, 75% of the blockage degree is the turning point of the stress change of tunnel lining. It is concluded that due to the blockage of the drainage pipe, the lining stress increases obviously. When the groundwater level is increased due to the blockage of the drainage system, the lining stress is more unfavorable. Therefore, in the process of tunnel construction, attention should be paid to the effective drainage of drainage system to ensure the safety of lining structure.

Key words: tunnel engineering, groundwater level, tunnel drainage pipe, crystallization clogging, lining stress

摘要： 为研究不同水位下隧道排水管结晶堵塞引起的衬砌应力变化规律，通过“以板代孔”法对排水管堵塞进行模拟，研究了5种堵塞工况与4种地下水位工况下隧道衬砌应力变化规律。结果表明：不同堵塞工况与不同水位工况下隧道衬砌应力变化规律是一致的；在同一堵塞程度下，随着原始地下水位的升高，隧道衬砌应力随之增加，隧道左右拱脚处衬砌最大主应力差值随之增加，最小主应力差值随之减小；在同一水位工况下，堵塞程度75%是隧道衬砌受力变化的转折点。由此可见，由于排水管的堵塞，衬砌应力明显增加，当地下水位由于排水系统堵塞升高时，衬砌受力更为不利。因而在隧道建设过程中应重视排水系统有效排水，保障衬砌结构安全。

关键词: 隧道工程, 地下水位, 隧道排水管, 结晶堵塞, 衬砌应力