甘塔斯隧道衬砌开裂原因探究

An Empirical Study on the Cause of Gantas Tunnel Lining Cracking

隧道二衬开裂常见的现象多为受到偏压、围岩沉降收敛、水压力大、养生不及时等作用而出现。本文通过一系列的调查统计数据,揭示一种罕见的二衬开裂现象,指出了在缺少土工布和防水板的情况下,由于二次衬砌混凝土收缩徐变,隧道二次衬砌与初期支护之间的摩擦力是导致二次衬砌开裂的主要原因。

The common phenomenon of tunnel’s secondary lining cracking is caused by unsymmetrical loading,rocks’ settling convergence,huge water pressure,not in time curing and etc. In this article,according to a series of investigation and statistics’ data,it reveals a rare phenomenon of tunnel’s secondary lining cracking. It is pointed out that the friction between the secondary lining and the initial support is the main reason for the secondary lining cracking due to the shrinkage and creep of the secondary lining concrete in the absence of geotextile and waterproof board.