After 553 days of fighting day and night，November fifteenth，Leshan-Xichang expressway.（Hereinafter referred to as Lexi Expressway）Smooth completion of the right side of Jiantang Tunnel，It marks a breakthrough in the construction of Lexi expressway Project.，It has laid a solid foundation for the opening of the whole line.。

Jiantang Tunnel passes through the western foothill of Huangdan Town, Muchuan County, Leshan City，It is a separated gas tunnel，The total length is 1993 meters，The maximum buried depth is 125 meters.。The geology is mainly sandstone.、Mudstone、Shale，It belongs to soft rock.，The grade of surrounding rock isⅣ、ⅤLevel，Local carbonaceous enrichment，Occasionally sandwiched with coal thread，Poor interlayer bonding，The self-stability of surrounding rock is poor.，There is low gas、Water gushing，And the tunnel entrance is located in the shallow-buried section，The exit is connected with the bridge and tunnel.，The space is small，It is difficult to build，High security risk。

Since entering the hole on May 11, 2021，The construction unit adopts the New Austrian Method for construction，According to“Tube advance、Short footage、Weak blasting、Strong support、Close it、Measure frequently”The principle of，Deal with water seepage in time、Rock fracture and other problems，By planning ahead、Program guarantee、Timely support and other measures，The fault is effectively overcome.、Accumulation body、Water gushing、Gas and other construction problems。

Lexi expressway is located in Leshan City.、Within Liangshan Prefecture，It is the expressway network planning of Sichuan Province.（2014—2030）The seventh of the eight vertical lines，It is another link between Chengdu Plain Economic Zone and Panxi Economic Zone.，The route runs through the Wumeng Mountain area and the Liangshan Mountains.，It is an important channel to get rich.。The construction of this expressway.，To improve the expressway network in Sichuan，Form multi-channel connection to Xichang、Panzhihua and Yunnan，Strengthen the radiation drive of Chengdu Plain Economic Zone to Panxi Economic Zone，It is of great significance to promote the development of Liangshan area.。