Yuanbaoshan tunnel of Lijiang Xiangtan railway runs through China Railway Construction Corporation

Recently, Yuanbaoshan tunnel of Lijiang Shangri La railway constructed by China Railway Construction 16th Bureau has been successfully completed, marking a breakthrough in the construction of Lijiang Xiangli railway. The 10.6km-long Yuanbaoshan tunnel of

is the first through ten thousand meter long tunnel of Lijiang Xiangtan railway, which is also a key and difficult project of the whole line. The tunnel is located in the middle section of Hengduan Mountain range and passes through two faults. The fracture structure is obviously developed. The surrounding rock is broken and the water inflow is large. It is a class I high-risk tunnel. In view of the construction problems such as large deformation of soft rock and water inrush from mud, the project department adheres to the principle of short footage and fast closure, and takes measures such as optimizing the section form, increasing the grouting and support strength, and appropriately increasing the reserved deformation to effectively reduce and control the deformation of surrounding rock. During the construction of

, the project department adopts the method of "breaking up into parts", dividing the Yuanbaoshan tunnel into 6 holes and 10 working faces to carry out the construction simultaneously, and putting in several double arm anchor drills to carry out the advanced horizontal exploration, adjusting the parameters of blasting and support in time according to the surrounding rock conditions, so as to ensure the construction safety and progress.

it is reported that the Lijiang Xiangtan railway is a key project of the national 13th five year plan and the medium and long term railway network planning and construction. The total length of the main railway line is 139.6km, which connects Lijiang ancient city, Yulong Snow Mountain, Tiger Leaping Gorge, Shangri La and other scenic spots. It is known as the most beautiful "Heaven Road" to Tibet. After the completion and opening of the railway, the railway network and transportation service in Northwest Yunnan will be supplemented, which is of great significance for promoting the economic development of Naxi, Yi and other minority areas in Northwest Yunnan.