The Di Luong Tunnel reopened to traffic on December 10th. (Photo: People's Daily)

According to Chinese media, after more than 1,560 days of construction, the Yiliang Tunnel – a key component of the Chongqing-Kunming high-speed railway project – has officially been completed, marking a breakthrough in high-speed railway construction under China's complex geological conditions.

Located in Zhaotong City, Yunnan Province, the Yiliang Tunnel is 24.8 km long, with its deepest point reaching 920 m. Designed for trains traveling at 350 km/h, it is the longest and fastest high-speed rail tunnel in China.

Running through the O Mong mountain range, which is considered a "geological museum," the Di Luong tunnel's construction is considered extremely difficult and carries the highest level of risk due to its rugged terrain, high mountains, deep valleys, and complex geological structure, including rock blasts, high temperatures, groundwater eruptions, mud, high stress, and gas.

To ensure construction progress and safety, the construction unit has innovated and created many technical measures. For rock blasting due to stress, engineers had to apply measures to release the stress beforehand, inject fiber-reinforced concrete, and reinforce anchor pillars; for high-temperature environments, they used intelligent temperature control systems such as ventilation and misting to maintain the temperature within the range of 30 degrees Celsius...

Furthermore, the engineering team also applies digital technology algorithms to study complex geological models such as terrain deformation and stalactite formation, in order to develop a construction engineering system. To date, the construction unit has been granted three provincial-level intellectual property rights, seven national-level intellectual property rights, and is currently applying for one international intellectual property right related to construction methods.

The Chongqing-Kunming high-speed railway is approximately 700km long, with 388.6km of it passing through Yunnan Province. This is Yunnan Province's first 350km/h high-speed railway. Upon completion and opening, travel time from Chongqing to Kunming will be reduced to approximately 2.5 hours, contributing to economic connectivity between Chongqing and Yunnan Province in general, and between cities within Yunnan Province in particular.

The Chongqing-Kunming high-speed railway is a key project in China's medium- and long-term railway network plan. This high-speed railway, with a train speed of 350 km/h, is approximately 700 km long, comprising 21 stations. It starts from Chongqing West Station, passes through Sichuan and Guizhou provinces, and ends at Kunming South Station in Yunnan Province.

According to nhandan.vn

Source: https://huengaynay.vn/kinh-te/trung-quoc-thong-tuyen-ham-duong-sat-cao-toc-350km-gio-dai-nhat-ca-nuoc-160822.html