重庆地区无衬砌隧道病害整治措施研究

Research on remedial measures for unlined tunnels in Chongqing

无衬砌隧道在长期的使用过程中,隧道围岩遭受风化、地下水及区域地应力等不利因素的作用,导致岩体性质恶化,影响了隧道的正常使用。通过对大溪河隧道进行现场踏勘及抗剪试验,结果表明,该隧道围岩质量整体较好,不会出现大规模塌方的现象。但由于局部地段出现了较多渗水、裂损及掉块等病害现象,需要对其进行整治。本文分析总结了无衬砌隧道的病害特征,并针对大溪河隧道里出现的病害现象,提出了相应的整治措施,为同类地区无衬砌隧道病害治理措施的选用提供了一定的参考。

During the long-term operation of unlined tunnels the surrounding rock of tunnel would be influenced by some harmful factors such as weathering, groundwater and regional ground stress. Through the field exploration and shearing strength tests for Daxihe tunnel in Chongqing, it is shown that the large scale collapse would not appear as the better quality of the surrounding rocks, but some remedial measures are needed for partial sections owing to the water penetration, the rock cracks and the drop-blocks. The features of the disease of the unlined tunnel are summarized, and the relevant remedial measures for the disease existed in Daxihe tunnel are presented which could provide the reference for the choice of remedial measures on unlined tunnels in the similar areas.