Projects

Supplied Product: Alkali-Free Liquid Accelerator

The Chengdu–Chongqing Expressway Zhongliang Mountain Tunnel Expansion and Renovation Project begins on the east side of Hangu Interchange and extends west to east, crossing Zhongliang Mountain and overpassing the Inner Ring Expressway, ending on the west side of the Er’lang Interchange, with a total length of approximately 8.9 kilometers. The project is built to urban expressway standards, with a design speed of 80 km/h.

The Zhongliang Mountain Tunnel section spans approximately 4.45 kilometers. The recommended plan involves constructing new single-bore two-lane tunnels on both sides of the existing tunnel, forming a cluster of three tunnels. On the north side, two new tunnels are constructed (120 m and 3,233 m) along with one widened section of the original tunnel (157 m), totaling 3,510 meters. On the south side, three new tunnels are built (252 m, 491.5 m, and 3,065 m), totaling 3,808.5 meters. The combined total length of new single-bore tunnels on both sides is 7,318.5 meters. Additionally, two new bridges are constructed in this section, with lengths of 114 meters and 174 meters, respectively.

The approach roads on both sides are symmetrically widened, expanding the standard roadway width from 24.5 meters to 35.5 meters, forming a bidirectional 8-lane expressway. The western approach section is approximately 1.57 kilometers long (from the east of Hangu Interchange to the west tunnel entrance), and includes key structures such as a widened highway overpass and a railway overpass.

The eastern approach section is approximately 2.86 kilometers long, divided into:

• 0.63 km from the east tunnel entrance to West Ring Interchange

• 0.39 km through West Ring Interchange

• 1.84 km from West Ring Interchange to Er’lang Interchange

This segment involves the reconstruction of the West Ring Interchange, widening two railway overpasses, demolishing and rebuilding one vehicular bridge, and replacing one pedestrian bridge.

Project Highlights:

Scientific and rational route and tunnel scheme selection: The overall layout of adding two new tunnels on either side of the existing one avoids areas of complex or poor geological conditions. Based on traffic demand, surrounding development, geological conditions, and traffic management needs, three alignment schemes were proposed and compared in terms of engineering feasibility, road geometry, impact on existing tunnels, construction period, and investment. The final recommended scheme adopts a “2+2+2+2” bidirectional 8-lane tunnel cross-section, ensuring optimal technical, economic, and operational performance.