The first class I high risk tunnel of Lijiang Xiangtan railway has been successfully completed

At 10:16 on October 24, 2019, Wenbishan No.2 tunnel of Yunnan Lijiang Shangri La railway constructed by China Railway 21 bureau group was successfully connected, which is the first class I high-risk tunnel connected by Lijiang Shangri La railway. The construction personnel of

are measuring the penetration accuracy of Wenbishan tunnel 2. Located in Lijiang City, Yunnan Province, the

Wenbishan tunnel 2, with a total length of 3253 meters, crosses Lijiang Jianchuan fault and wenbifeng No. 2 fault. The geological lithology is mainly expansive soil, mudstone and lime mudstone. Karst development, large deformation of soft surrounding rock, many faults, large water inflow, the maximum daily water inflow of more than 6000 cubic meters, is a class I high-risk tunnel, which is a key and difficult project of the whole line of Lijiang Xiangtan railway. The construction personnel of

are carrying out the support and welding operation of the tunnel. In the most difficult time, the soft rock deforms greatly, and water and mud burst out in a concentrated way. At that time, the workers went through waist deep water to work in the tunnel every day. The construction was very difficult. It can be said that at that time, they picked it up one centimeter by one centimeter. " Wang Jianheng, manager of the first division of Lixiang Railway Project Department of China Railway 21 Bureau, said.

the constructors of China Railway 21 Bureau celebrate the opening of tunnel

since the commencement of construction in April 2015, the constructors of China Railway 21 Bureau adjust the construction scheme in time according to the change of surrounding rock, adopt the three step method for construction, reserve the core soil, pre reinforce in advance, excavate and support one by one, spray and reinforce, overcome the tunnel slide and mud burst for many times. On the basis of ensuring the construction progress of the tunnel, the goal of "zero accident" safety and "zero defect" quality breakthrough can be realized successfully. A 6031 a 6031 technician studies the tunnel construction scheme on site a 6031 a 6031 technician studies the tunnel seepage solution during the construction a 6031 a 6031 constructor is carrying out the arch support operation a 6031 a 6031 Wenbishan No.2 tunnel passes through the wetland Provincial Nature Reserve of wenbihai plateau in Lijiang, and ensures the same construction safety At that time, the participants of China Railway 21 bureau also strictly implemented the concept of "green construction", adopted mechanical and manual excavation into the tunnel, strictly controlled the construction drainage, and other measures to fully protect the plants, trees, mountains and water along the line, and strive to build a "high-quality, safe, green and harmonious" Lijiang railway. The main line from the exit of No.2 tunnel of Wenbishan of

Lijiang to Shangri La railway is about 139 kilometers long, with a design speed of 120 kilometers per hour. It is an important part of the "Western Railway Network" in China's medium and long-term railway network planning. After completion and opening to traffic, it will end the history of no railway in Diqing Tibetan Autonomous Prefecture of Yunnan Province. (text Zhao Shujun, Hao Yafan, photography Chen Chang)