期刊名称：IOP Conference Series: Earth and Environmental Science
印刷版ISSN：1755-1307
电子版ISSN：1755-1315
出版年度：2020
卷号：570
期号：2
DOI：10.1088/1755-1315/570/2/022003
语种：English
出版社：IOP Publishing
摘要：The length of NL Tunnel in North China is 23.4 km. The ballast bed of the tunnel is a heavy-haul and double-block, ballast-less track. After being completed and opened to traffic, serious diseases such as concrete corrosion, cracking of the lining, deformation of the side wall, and uplift of the track bed were observed. The cumulative length of the disease-carrying tunnel, ~1.4 km, negatively affects the safety of motorists. On-site investigation, theoretical analysis, experimental testing, and numerical calculations, revealed that tunnel diseases result from various factors. That is, owing to the complex geological structure, changes in the volume and quality of groundwater in the gypsum-bearing rock layer were accompanied by special low-temperature sulfate corrosion, rare differential expansion, and significant water-sensitive softening with rheological characteristics. These phenomena eventually resulted in tunnel diseases. Through stability analysis and field practice, an effective set of measures was adopted. These measures included a support structure system combined with near-circular cross sections and buffer layers, a new type of drainage system with special rock layers from inside to outside, and lining structural materials with low-temperature sulfate resistance.
