Secret： After more than 10 years, how does the new chengdu-kunming railway break through the ＂impossible＂？

　　Travel faster

　　The travel time from Chengdu to Xichang, Panzhihua and Kunming will be greatly reduced.

　　Develop faster

　　The freight distribution in southwest China will also be further changed, and the economy of the region and the areas along the route will usher in brand-new development.

　　Chengdu Business Daily-Red Star Journalist Yan Yuheng Du Yuquan

　　Intern reporter Zhang Zhiyi Photojournalist Tao Wei

　　Recently, the reporter learned from China National Railway Group Co., Ltd. that with the completion and opening of the Emei-Mianning section of new chengdu-kunming railway on December 26, the 915-kilometer-long new chengdu-kunming railway will be fully operational, and the travel time from Chengdu to Xichang, Panzhihua and Kunming will be greatly reduced, with the fastest time being 3 hours, 5 hours and 7.5 hours respectively. The freight distribution in southwest China will also be further changed, and the economy in the region and along the route will usher in a brand-new development.

　　New chengdu-kunming railway starts from Chengdu South Railway Station, passes through Chengdu, Meishan, Leshan, Liangshan Yi Autonomous Prefecture and Panzhihua in Sichuan Province, weichu and Kunming in Yunnan Province, and ends at Kunming Station. It is a national I-class double-track electrified railway with a design speed of 160 kilometers per hour.

　　With the start of capacity expansion in chengdu railway station, the starting and ending station of old chengdu-kunming railway, new chengdu-kunming railway has ushered in a new starting point: Chengdu South Railway Station. It is understood that in order to facilitate passengers’ travel, Chengdu South Railway Station has newly invested 8 ticket gates and 2 self-service check gates to further improve passengers’ passing capacity. At the same time, platforms 1-4 connecting new chengdu-kunming railway will be fully put into use, which will effectively cope with the pressure of traffic organization after the opening of the new line.

　　At 14: 00 on December 24th, tickets for the 26th New chengdu-kunming railway were officially put on sale. The reporter inquired about Railway 12306 and found that the earliest D875 train had a fare of 424 yuan for first class and 264 yuan for second class. The new chengdu-kunming railway was opened on December 26th, and there were three trains to Kunming through the new chengdu-kunming railway that day. Apart from Chengdu to Kunming, Chengdu to Xichang is what many people are most concerned about. The reporter found that on the 26th, there were 12 trains from Chengdu to Xichang, 6 trains arrived at Xichang West Station and 6 trains arrived at Yuexi West Station. Among the trains arriving at Xichang West Station, the fastest ones are the first and the last one, which takes 2 hours and 55 minutes to arrive at Xichang West Station. In terms of fares, the price of the second-class seat from Chengdu to Xichang West is 149 yuan, and the first-class seat is 239 yuan.

　　Delicious and playful introduction

　　Take the bullet train to the "sunshine tour"

　　● Meishan Station: Sansu Temple and Dongpo Fish

　　The first stop of new chengdu-kunming railway: Meishan, the hometown of Dongpo. Dongpo District of Meishan City, formerly known as meishan county, is Su Dongpo’s hometown that he has never forgotten all his life. Due to the convenience of rivers, Meishan is rich in carp and crucian carp. Su Dongpo, out of nostalgia for his hometown fish, improved the method of cooking fish and created his own "Dongpo fish".

　　● Leshan North Station: watch the Buddha and taste the chicken.

　　Parallel to the Minjiang River, New chengdu-kunming railway came to Leshan. The Leshan Giant Buddha, carved on a cliff, has stood here for more than 1,200 years, sitting dangerously near the river and looking solemn. Leshan is famous for its small vegetarian diet, including almsgiving chicken, sweet-skinned duck, and stilted beef … …

　　● Emei Station: Go to Jinding and drink tofu brain.

　　Mount Emei, wrapped in white in winter, gives Chengdu people a sense of ceremony to see the snow. Climb the Jinding early in the morning and overlook it. The view is wide, the scenery is magnificent, and the heavy snow covers the vast forest. Here, the salty and silky Emei tofu brain has been legendary in the rivers and lakes for a long time, waiting for you to taste.

　　● Mianning Station: Visit the Bohai Sea and climb Lingshan Temple.

　　As the train goes deeper into Liangshan Prefecture, the scenery outside the window becomes more magnificent. In Mianning, the glittering and translucent Yi Sea resembles a glittering sapphire embedded in the mountains. Lingshan scenic spot is a national AAAA-level scenic spot. Lingshan Temple was built in the Qianlong period of Qing Dynasty, with a history of more than 200 years. It has the reputation of "the first mountain in southern Sichuan and the first temple in Panxi".

　　● Xichang West Station: Go to Qionghai and have a brazier barbecue.

　　In Xichang, the capital of Liangshan Prefecture, New chengdu-kunming railway came to a long and narrow plain — — Anning valley. On the east side of the city, it is the second largest freshwater lake in Sichuan Province — — Qionghai. When you go to Xichang, you have to have a brazier barbecue. The brazier barbecue is large in meat, full of fire and flavor, and it was selected as the second batch of intangible representative projects in Xichang City.

　　● Miyi East Station: fruit in "inland Sanya"

　　Four hours later, the train came to Miyi, the southern tip of Sichuan. Here, the sunshine is abundant and warm, the air is fresh and dry, and the annual average temperature is 20.5℃, which is called "inland Sanya". When you enter Miyi, you must taste the most sunny fruits.

　　● Panzhihua South Station: Touching the Time Stamp of Third Line Construction

　　Come all the way south to Panzhihua and feel an epic city in the history of third-line construction. More than 60 years ago, the third-line builders came with a mission. It seems that we can still feel the intense and warm pulse of that era in the construction of the museum in China, Panzhihua.

　　● Yuanmou West Station: Feel the strange Danxia landform.

　　After leaving Panzhihua City, New chengdu-kunming railway began to climb up from Jinsha River Valley and passed through Yuanmou County, weichu City, Yunnan Province. Yuanmou soil forest is a peculiar Danxia landform. After millions of years of crustal movement, it presents a fantastic world with different charms.

　　● Kunming Station: Feel the immersive "seagull blockbuster"

　　Keep going south. Finally, chengdu-kunming railway came to Kunming at an altitude of 1,890 meters. When the motor train roared, it was also the time for migratory birds to return to the south. Warm sunshine and excellent ecological environment attracted a large number of red-billed gulls to fly from Siberia and set up camp in Dianchi Lake.

　　reveal a secret

　　After more than 10 years

　　How does the new chengdu-kunming railway break through the "impossible"?

　　On December 26th, the new chengdu-kunming railway will be fully operational. After more than 10 years of construction, this bullet train line connecting Chengdu, Leshan, Liangshan and Kunming will greatly facilitate people to travel along the line.

　　After the new chengdu-kunming railway was introduced from Chengdu, it crossed Minjiang River and Qingyi River. Through Emei, along the Dadu River, across the Liangshan Mountains; It runs vertically through southwest Sichuan and northern Yunnan, which are separated by mountains and valleys and rivers. The new line runs in the same direction as the old line, and many areas are parallel. Therefore, the dangerous rocks, cliffs, high mountains and canyons seen when riding the old route are no less for new chengdu-kunming railway.

　　Looking back, the old chengdu-kunming railway was completed in the sound of "impossible", and the area where the line passed was called "geological museum", which was considered as a "forbidden area" for railway construction by foreign experts, but it was under such circumstances that our ancestors completed the construction of the old chengdu-kunming railway.

　　Today, more than 50 years later, the mountain is still that mountain, and the water is still that water. New chengdu-kunming railway is also built and opened to traffic in such a "forbidden zone". Where is it difficult?

　　"geological museum" visited a point more than 10 times.

　　It is no exaggeration to call the area where the line passes "geological museum". During the route selection of the new line, in order to avoid a risk point, the designer has not yet started construction, and has visited the vicinity of this point in Ganluo for more than 10 times. The route plan has been revised repeatedly, and it took more than a year to finalize it.

　　"In the route selection stage, what bothers us most is the Edeniri River Double-line Bridge." According to Miao Qinghua, design director of Cheng Kun double-track bridge of China Railway Second Hospital. The geological conditions here are complex, including landslides, dangerous rocks, falling rocks, collapses, rock piles, mudslides, scattered mountains and karst. "Generally, in the face of such situations, with the current technology, we can still choose the nearest route and use tunnels to cross these areas. However, when the reconnaissance was further carried out, it was found that the local area was mined in the mountains in the early years because of the discovery of minerals, and its internal tunnels were vertical and horizontal. After checking a lot of information, it is impossible to determine the direction of the tunnel. For safety reasons, we have to choose other ways to cross. " Miao Qinghua told reporters that in order to further determine the route direction and form, before the final construction, he and his colleagues went to the site more than 10 times in a row to determine the route direction. Finally, the route is determined to cross the area in the form of a bridge.

　　"tunneling in quicksand" to overcome world-class problems

　　If we say that bridge construction is to avoid risks, tunnel construction is to face the adverse geological impact, of which the most representative is undoubtedly the most difficult tunnel to build along the whole line — — Jixin tunnel

　　According to Liu Zhigang, the design director of Cheng Kun Double-track Tunnel of China Railway Second Hospital, the geological conditions of Jixin Tunnel are complicated, and the section passing through dolomite is nearly 11 kilometers long. Dolomite is a kind of sedimentary carbonate rock layer, which will form a very special dissolution phenomenon — — The "sandification" of dolomite is easy to cause geological disasters such as water gushing, sand gushing and large-scale collapse during tunnel excavation.

　　"To put it simply, construction in such geology is like ‘ Tunneling in quicksand ’ You can imagine the difficulty of construction. " Liu Zhigang told reporters that the problem of dolomite sandification is a world-class problem that has never been encountered in the world, and there is no technical reference for tunneling. For the construction at that time, it was "crossing the river by feeling the stones" while studying and constructing. Then, after a period of argumentation, it was finally decided to adopt the three steps of pipe shed support, drilling and blasting, and milling and digging, combined with the excavation method. To put it simply, it is to arrange the dense pipe shed in advance in the upper strata of the excavation section, strengthen the support around it, and jointly form an "iron shell", and then excavate and excavate in a small section, which is equivalent to moving forward in small steps under the protection of the "iron shell". In this way, Jixin Tunnel has overcome the world-class construction problems.

　　The water inflow of the longest tunnel is like 15 West Lakes.

　　Walking the whole new chengdu-kunming railway, the most representative section is undoubtedly Emei to Mianning, and the most representative project in this section belongs to Xiaoxiangling Tunnel. The Xiaoxiangling Tunnel, with a total length of 21.775km, not only effectively shortens the line length, but also represents a dream for the unfinished draft of Old chengdu-kunming railway. What are the unknown difficulties in the construction of the longest tunnel in the whole line? Downturn to version 02