Home page

Dalian Bay Subsea Tunnel | Hard Rock & Shallow Cover

Dalian Bay Subsea Tunnel

UCS ≈ 100 MPa hard rock + 7 m shallow overburden

Construction period shortened by 35 days, tool wear significantly reduced

Category:

Tunneling Cutting Picks – Application Cases

Client Background

As a national-level major infrastructure project, the Dalian Bay Subsea Tunnel faced extreme dual challenges during construction.

From a geological perspective, the tunnel encountered complex formations composed of hard rock interbedded with quartz sandstone, with partial rock masses exhibiting uniaxial compressive strength (UCS) up to 100 MPa.

From an environmental perspective, the tunnel passes beneath a large petrochemical facility, with an overburden thickness of only 7 meters. Any excessive excavation disturbance could lead to severe safety consequences, placing unprecedented demands on excavation stability and cutter reliability.

Rock layer state

Customized Solution

To balance excavation efficiency and construction safety, the project owner conducted extensive comparative evaluations and ultimately selected Xinda as the full-process cutter supplier for the project.

Xinda provided a hard-rock cutter series, supported by comprehensive on-site technical services:

High-Performance Carbide Grade Ensures sustained cutting capability and high wear resistance in hard rock with UCS up to 100 MPa.
Optimized Cutting Geometry Enables stable, continuous excavation while minimizing vibration and ground disturbance.
Consistent Quality Control Guarantees predictable and uniform wear behavior for each cutter pick, reducing the risk of unexpected failures and unplanned downtime.
On-Site Technical Support Dedicated service teams conduct regular inspections, monitor cutter wear conditions, and provide real-time technical assistance to ensure smooth project execution.

Project Outcomes

Thanks to the exceptional performance and stability of Xinda cutter picks, the project achieved results beyond expectations and received high praise from the project management team.

Significant Schedule Advancement