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Home Technical Articles Anti-Floating Performance Optimization of HDPE Double-Wall Corrugated Pipes in Soft Soil Foundations ——Collaborative Design for Structural and Construction Stability

Technical Articles

Anti-Floating Performance Optimization of HDPE Double-Wall Corrugated Pipes in Soft Soil Foundations ——Collaborative Design for Structural and Construction Stability

/ Post by by 孙飞虎

1. Research Background


HDPE double-wall corrugated pipes face buoyancy risks in soft soil (bearing capacity <80kPa) and high groundwater (depth <2m):


  • Coastal city statistics show 12% flotation rate during rainstorms, causing joint separation and deformation
  • Traditional anti-floating measures (e.g., concrete blocks) increase costs by 25% and reduce pipe flexibility

2. Core Issue: Buoyancy Mechanism

2.1 Buoyancy Model


Critical buoyancy condition based on Archimedes' principle:\(G + F_f \geq \rho_w \cdot V \cdot g\) Where:


  • G = pipe weight, \(F_f\) = soil friction
  • \(\rho_w\) = groundwater density, V = displaced volume

2.2 Key Parameters


Parameter Traditional Design Optimization Goal
Unit weight (kg/m) 8-12 Increase to 15-18kg/m
Friction coefficient 0.2-0.3 Increase to 0.4-0.5
Backfill density (kg/m³) 1800 Increase to 2000kg/m³

3. Anti-Floating Structure Optimization

3.1 Counterweight Design


Innovative "internal weight ring + external pressure groove" (Figure 1):


  • Unit weight +50% (dn300 from 10kg/m to 15kg/m)
  • Safety factor increased from 1.05 to 1.52
  • 85% flexibility retained

3.2 Structure Comparison


Structure Type Weight (kg/m) Safety Factor Ring Stiffness (kN/m²)
Plain pipe 10 1.08 8
Counterweight pipe 15 1.55 10
Concrete pipe 80 3.20 120

4. Construction Optimization

4.1 Anti-Floating Backfill


"Three-Layer Backfill" (CJJ/T 30-2021):


Layer Material Thickness (mm) Compaction Friction Coefficient
Bottom Medium-coarse sand 200 ≥90% 0.35
Middle Graded gravel + geogrid 300 ≥95% 0.50
Top Clay 500 ≥92% 0.25

4.2 Anchor Design


Developed "U-shaped anchor + steel belt" system (Figure 2) with 8kN/m pullout force:


  • Anchor spacing 2m
  • Steel belt strength 200MPa
  • Applicable to dn200-dn800mm

5. Engineering Solutions

5.1 Anti-Floating Standard


Based on GB/T 50470-2019:


Parameter GB Requirement Optimized Standard Test Method
Anti-floating safety factor ≥1.1 ≥1.5 Buoyancy calculation and test
Pullout force (kN/m) - ≥6 Pullout test machine
Backfill friction coefficient - ≥0.45 Direct shear test

5.2 Stability Calculation


Finite element-based safety factor formula:\(K_f = \frac{G + \mu \cdot (P + W)}{F_b}\) Where:


  • P = surcharge, W = backfill weight
  • \(\mu\) = friction coefficient, \(F_b\) = buoyancy

6. Field Test Case: Coastal Development Zone


Index Traditional Pipe Anti-Floating Pipe Standard Requirement
Flotation rate (%) 12 1 ≤3
Construction cost (¥/m) 280 320 -
5-year deformation (%) 5.2 2.1 ≤3

7. Advanced Technology Prospects

7.1 Smart Buoyancy Monitoring


Integrated water pressure sensors + inclinometers for real-time buoyancy-weight balance monitoring (±5% accuracy).

7.2 Bionic Root Anchoring


3D mesh anchors inspired by mangrove roots increase pullout force by 40%.


Conclusion This paper develops an anti-floating system through counterweight structures + backfill optimization + anchoring reinforcement. As a professional supplier, we provide: ✅ Custom anti-floating pipes (dn200-dn1200mm) ✅ Soft soil anti-floating design calculations ✅ Third-party anti-floating test reports


Keywords: HDPE double-wall corrugated pipe, anti-floating performance, soft soil foundation, pullout force, CJJ/T 30

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