Changsha Nanhu Road Xiangjiang Tunnel
Release time:
2025-12-24
Abstract
Construction unit: China Railway Tunnel Bureau Group Co., Ltd.
Device Number: ("Orange Isle No. 2" Tunnel Boring Machine) China Railway Equipment
Cutting disc diameter: 11.65 meters
Tunneling length: 1343 meters
Project Features:
This project is the first tunnel construction in Hunan Province to employ the slurry balance shield method with a large diameter of 11.65 meters, breaking away from the traditional construction approach for cross-river tunnels in the region. Located in the heart of the city, between the Juzizhou Bridge and the Houzi Shi Bridge, the project site features dense traffic and a complex network of underground utilities. The extremely shallow burial depth poses significant risks during tunneling; the construction not only requires extensive relocation of utility lines and demolition of buildings but also demands careful coordination between construction activities and urban traffic as well as residents' daily lives. Moreover, the site has numerous overlapping work areas and limited space. During tunneling, the construction team encountered a zone with developed karst caves, which became the primary obstacle to progress. To overcome this challenge, the contractor conducted pre-treatment of the karst caves by injecting grout beneath the riverbed and pre-filling them with concrete slurry. At the same time, they adjusted tunneling parameters and slowed down the tunneling speed, successfully resolving this difficult issue.
Year of commencement: September 2010
Year of completion: December 2013
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