In order to solve the problem of supply of main materials after the barrier lake was formed, the project department built several temporary wharfs and purchased large barges to transport the construction materials.
Because of developmental joint fissure of rocks along the line and the broken rocks, coupled with the steep mountains, collapse may happen with the action of gravity. For general collapses, subgrade protection, slope cleanup and setting of blocking structures were adopted. For some very serious sections, tunnels or tunnel sheds were built.
In order to cope with the problem of short construction time, low temperature and everlasting snow in winter, the project department established Khunjerab Plateau Commando, Khunjerab Snow Slid Rescue Commando and so on, and held labor competition to enhance the working efficiency.
In order to solve the problem of high-altitude perennial frozen soil, the project constructors observed and tested the freezing and thawing characteristic of the frozen soil all year round. Through adding high-strength Geogrid to the top layer of the subgrade and adopting the construction technology ballast ventilation embankment, they basically solved the influence of frozen soil on the subgrade settlement.
Washout selection is mainly located at the Sust- K796 valley line deep-cutting gorge section. The project department adopted such design schemes as raising the subgrade, setting up bank protecting wall, wire gabion and spur dike.
Debris flow is one of the most serious geological disasters for this project with a high outbreak frequency and a high distribution density. Based on the size and cause of debris flow in different places, the project department set up such structures as aqueduct and open cut tunnel, accordingly, along the line.
In order to control the influence of landslide on the highway safety, the project department set up anti-slide retaining walls at the landslide sections.
As for the snow slide-prone areas in the Shaxikot-Khunjerab, the project department set up the line based on the principle of passing round as much as possible; if the section that really can’t be passed round, open cut tunnels or tunnels were adopted.
Salivary flow ice distributes at the Deho- Khunjerab Section 3200m above sea level. The project department effectively improved it through strengthening the drainage, improving the side ditches and setting up ice retaining walls.