Beijing-Tianjin Intercity Extension Project Section 3
Release time:
2025-12-24
Abstract
Construction unit: China Railway 16th Bureau Group Co., Ltd.
Device Number: ("Jianwanghao" Tunnel Boring Machine) China Railway Equipment
Cutting disc diameter: 11.97 meters
Tunneling length: 2250 meters
Project Features:
The section of the project is located in a coastal alluvial plain, where the geological strata are predominantly composed of clay, silty clay, and silty loam. These soil types are characterized by high sensitivity, low strength, relatively high compression coefficients, and a strong tendency to creep and undergo disturbance. During tunnel boring machine (TBM) excavation, they can easily induce ground deformation, posing significant challenges to tunneling operations and the stability of the surrounding rock mass. In this section, the upper layer contains Quaternary unconfined groundwater, while the underlying fine sand and silt layers harbor micro-artesian groundwater. The tunnel runs directly beneath Jiefang Road’s commercial district, requiring continuous side or undercrossing of 32 commercial buildings. Along the route, eight locations have been identified as being of extremely high risk, and five others as being of high risk. Moreover, the underground area is crisscrossed by 45 utility pipelines—including power, water supply, and gas lines—of which 18 require special reinforcement measures. The minimum curve radius for the TBM tunnel is only 450 meters, accounting for nearly 25% of the total tunnel length. Furthermore, the project employs a large-diameter TBM with a diameter of 11.97 meters—a configuration that has no precedent yet in domestic tunnel construction projects involving tunnels of similar diameter.
Year of commencement: February 2009
Year of completion: December 2014
Previous:
More news
