What is the road condition from Mianning to Ya 'an in Liangshan Prefecture of Beijing-Kunming Expressway? How far is this trip?

The whole journey from Mianning to Ya 'an in Liangshan Prefecture is about 298.8 kilometers, 5 hours and 50 minutes. Mianning county 1. Driving scheme in Mianning county

Details: 1) Start from the starting point in the east direction, drive 80 meters, turn right and enter S2 152. Follow S2 15 for 2.2km, turn left and enter G 1083. Follow G 108 102.8km and go straight into the second section of Binhe Road. Turn left into Shimian Bridge. 5. Drive along Shimian Bridge for 370 meters and turn right into G 1086. Follow G 108 189. 1 km and turn right into Shengli Road. 7. Drive along Shengli Road 170 meters and go straight into West Street. 8. Ya 'an City Driving Plan.

Details 1) Drive 490 meters along West Street and go straight into Middle Street 2) Drive 4 10 meters along Middle Street and go straight into East Street 3) Drive 420 meters along East Street, cross Linjiang Building on the left and go straight into Xinmin Street 4) Drive along Xinmin Street 140 meters, pass through Changhong Color TV Store on the right and go straight into Jiang Qiang South Road. After passing the electrical appliance on the right roof for about 50 meters, turn right and enter Shangba Road. 6) Drive along Shangba Road 170 meters and reach the destination (on the right side of the road). The expressway you mentioned is also "Yaxi Expressway". Ya 'an to Xichang is 240 kilometers long. From Yucheng to Yingjing section of Ya 'an, from 20 1 1 0, the Yucheng-Yingjing section of Yaxi Expressway was completed and put into trial operation. Auxiliary facilities are still under construction. Yihai to Lugu, 201010 On the afternoon of February 29th, the Yihai-Lugu section of Yaxi Expressway was officially completed and opened to traffic. The opening ceremony was held at Mianning Toll Station. Yaxi Expressway is designed as a two-way four-lane highway, located in Zishi, Yingjing, Shizi, Jiuxiang, Hanyuan, Shimian, Liziping, Yihai and Mianning. There are 270 bridges and 25 tunnels in the whole line of Yaxi Expressway, and the proportion of bridges and tunnels accounts for 54.25% of the total length of the line, among which there are many extra-long tunnels and extra-large bridges. Editor's Note: The construction of Yaxi Expressway in this section is famous for its four characteristics of "high, large, difficult and new". Many technologies of design and construction have reached the international and domestic leading level, and many data have reached the highest level in the history of China's traffic construction. 1. The tunnel is designed as the first small-radius double helix tunnel in the history of the first world expressway, and it is the key control project of Yaxi Expressway. The plane alignment of the two tunnels is a single domestic first expressway spiral tunnel effect map [1], and the curve radius is about 600 meters. The whole tunnel is uphill from north to south, with a total length of about 4.74 kilometers. The geological conditions in this section are very complicated, especially in the area where the two tunnels are located, where the eastern branch of the Anning River fault and the Tiezhaizi-Gu Cao fault pass through. The seasonal freezing and snow problems further aggravate the complexity of this section, and the design must take into account the safe and smooth climbing of the car. The route designed by the Institute starts from Yuangen Village, passes through Liziping Township and Tiezhaizi, and finally reaches Dayingpan. The straight-line distance between the starting point and the ending point is only12.352km, but the altitude climbs from1.649m to 2362m, with a height difference of 71.3m.. If the driver is careless according to the traditional buffer gradient method, rollover may occur; Secondly, if the road is built directly, it will be too steep and the Panshan Highway will be too long. Therefore, the designer thought of using the double helix tunnel. When the car passes through the tunnel, it can easily climb more than 300 meters almost in situ. The design of small radius double helix curve tunnel overcomes the height difference of 12.35km and 729m, avoids the fault zone and seasonal frozen soil zone, reduces the entrance slope of longitudinal tunnel, and avoids the bad geological zone of active faults and Liziping Nature Reserve in Shimian County. According to the data, designing expressways is just a waste of time in the world. The single tunnel length of Daxiangling Tunnel is10007m, which is the longest tunnel in southwest China, with the maximum buried depth of1650m, ranking first in the world. In the field of domestic highway construction, there are only a handful of highway inclined shafts with a length exceeding 1000m and an inclination of 28 degrees. 2. The largest single pier bridge in Asia is Labajingou Bridge in Yingjing County, which is left 8 (right 7)×40m+ 105m+2×200m+ left 5 (right 4)×40m prestressed concrete continuous rigid frame main bridge+simply supported T-beam approach bridge, of which 65438+ Tiezhaizi Bridge/KLOC is located in Menghuo Village, Shimian County. 3. Yaxi Expressway with the most complicated geological structure is located in the transition zone between Sichuan Basin and Plateau, with the lowest elevation of 620m and the highest elevation of 2450m. Along the expressway, the mountains are undulating, the ravines are vertical and horizontal, the mountains are steep, and the dense forests overlap. The route successively passes through the high intensity areas of earthquakes of magnitude 7, 7 and 7, and passes through active faults such as Anning River, Xianshui River and Daliangshan. The route passes through rainy and foggy areas, seasonal frozen areas of Mud Mountain and Tuowu Mountain, coal mined-out areas, granite mining areas, asbestos tailings mining areas, mudslides and other geological disease-prone areas, provincial nature reserves and reservoir areas for about 60 kilometers. Geological structure is the most complicated in the history of expressway construction in China.