偏压隧道下穿泥石流冲沟防护结构
By setting up sidewalls, retaining walls, anti-slide piles, and debris flow gullies at the point where the tunnel passes under a debris flow gully, a comprehensive protection system is formed, which solves the problems of bias load and debris flow erosion, and improves the stability and safety of the tunnel.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SICHUAN HIGHWAY PLANNING SURVEY DESIGN AND RESEARCH INSTITUTE LTD
- Filing Date
- 2025-09-19
- Publication Date
- 2026-07-17
AI Technical Summary
Existing technologies lack systematic and comprehensive solutions, and cannot effectively address the asymmetrical loads, debris flow erosion, and shallow lateral slippage issues when tunnels with biased pressure pass under debris flow gullies, resulting in insufficient stability and safety of the tunnel structure.
Side walls and retaining walls are installed on the shallow buried side of the open-cut section of the tunnel, and a backfill layer is installed at the bottom of the walls for anchoring; anti-slide piles are installed on the deep buried side; debris flow ditches are installed at the top of the tunnel, and grouting is carried out at the bottom and slope surface for anchoring; high-strength concrete and steel pipe piles are used to reinforce the structure, forming a comprehensive protection system.
It effectively balances asymmetrical loads, prevents tunnel slippage and debris flow erosion, enhances the overall structural stability and safety of the tunnel, and ensures operational safety.
Smart Images
Figure CN224515188U_ABST
Abstract
Claims
1. A bias tunnel underpass debris flow gully protection structure, characterized in that: A sidewall (2) is provided on the shallow buried side of the tunnel (1) and a retaining wall (3) is provided on the shallow buried side of the tunnel (1). The retaining wall (3) is located behind the sidewall (2). A wall bottom backfill layer (4) formed by concrete replacement is provided at the bottom of the sidewall (2) and the retaining wall (3). The wall bottom backfill layer (4) is anchored to the surrounding rock at the bottom of the tunnel by a wall bottom grouting pipe (5). A row of anti-slide piles (8) is provided on the deep buried side of the tunnel (1) along the longitudinal direction of the tunnel (1). A debris flow ditch (10) is provided at the top of the tunnel (1) at the debris flow gully. The debris flow ditch (10) gradually extends downward from the slope side to the sidewall (2). A ditch bottom backfill layer (11) formed by concrete is provided at the bottom of the debris flow ditch (10). The adjacent sides of the bias slope surface of the debris flow ditch (10) and the ditch bottom backfill layer (11) are anchored to the slope by a grouting steel pipe (12).
2. The biasing tunnel under debris flow gully protection structure according to claim 1, characterized in that: The cross-section of the debris flow ditch (10) is trapezoidal, wider at the top and narrower at the bottom.
3. The biasing tunnel under debris flow gully protection structure according to claim 2, characterized in that: The debris flow ditch (10) is a C30 concrete structure; the backfill layer (11) at the bottom of the ditch is a C20 concrete structure.
4. The biasing tunnel under debris flow gully protection structure according to any one of claims 1-3, characterized in that: The bottom of the tunnel (1) is provided with a tunnel bottom backfill layer (6) formed by concrete replacement, and the tunnel bottom backfill layer (6) is anchored to the surrounding rock of the tunnel bottom by a tunnel bottom grouting pipe (7).
5. The bias tunnel under debris flow gully protection structure according to claim 4, characterized in that: Both the wall bottom backfill layer (4) and the tunnel bottom backfill layer (6) are C20 concrete.
6. The bias tunnel under debris flow gully protection structure according to claim 4, characterized in that: The diameter of the wall bottom grouting pipe (5) is larger than the diameter of the tunnel bottom grouting pipe (7).
7. The biasing tunnel under debris flow gully protection structure according to any one of claims 1-3, characterized in that: Foam board (9) is filled between the anti-slide pile (8) and the tunnel (1).
8. The biased tunnel protection structure under debris flow gullies as described in any one of claims 1-3, characterized in that: A steel pipe pile reinforcement section (13) is provided on the back side of the retaining wall (3) on the shallow buried side of the tunnel (1). The steel pipe pile reinforcement section (13) includes a connecting beam (13-1) and several steel pipe piles (13-2). The several steel pipe piles (13-2) are arranged in a quincunx pattern, and the connecting beam (13-1) is fixed to the top of the several steel pipe piles (13-2).
9. The biasing tunnel under debris flow gully protection structure according to claim 8, characterized in that: Small grouting pipes (14) are installed on the slope surface.