GEOTEXTILE

Pre-Construction Preparation

1. Material Selection

• Impermeable geotextile (≤10⁻⁶ cm/s permeability)

• Minimum tensile strength: 15kN/m (ASTM D4595)

2. Equipment Setup

• Automatic laying machine (capacity: 200-300m²/hr)

• Dual-track welder (temperature range: 250-350°C)

3. Subgrade Preparation

• Surface tolerance: ≤3mm/m² irregularity

• Oil contamination: <1% surface coverage

Installation Procedures

1. Deployment Methodology

• Orientation:

• Cross-machine direction perpendicular to drainage flow

• 1-2% prestress tension during unrolling

• Seaming Standards:

  Method	Specification
  Overlap	150mm minimum
  Welding	40mm dual-track seam

2. Critical Detail Engineering

• Wall Junctions:

• 300mm vertical upturns with butyl tape sealing

• Pipe Penetrations:

• Pre-formed boots with stainless steel clamps

Quality Assurance Protocol

1. Inspection Regimen

• Visual Examination:

• 100% coverage for wrinkles/tears

• Pressure Testing:

• 24hr water test @ 50mm depth

• Vacuum box testing (@ 25kPa) for seams

2. Material Verification

• Sampling Frequency:

• 1 test/500m² for tensile properties

• 5% seam peel tests (≥6N/mm)

Protection Measures

1. Construction Phase

• Traffic Control:

• Plywood roadways over installed geotextile

• Maximum ground pressure: 15kPa

2. Post-Installation

• Curing Period:

• 72hr protection before backfilling

• UV Shielding:

• Temporary cover with reflective tarps

Title: "Geotextile Waterproofing Systems for Underground Garages: Design and Installation Best Practices"

Key Performance Indicators:
▸ Leakage Rate: <0.1L/m²/day
▸ Installation Efficiency: 400-600m²/day
▸ Service Life: 25+ years (buried conditions)

Technical Standards:

• EN 13254: Geotextile characteristics

• ASTM D7176: Seam strength evaluation

• BS 8006: Structural use of geotextiles

Cost Analysis:

• Material: $3-8/m²

• Installation: $5-12/m²

• Lifecycle Savings: 40% vs. traditional membranes

Innovative Features:
✔ Self-healing seams: Microcapsule adhesive technology
✔ Smart monitoring: Embedded moisture sensors
✔ Modular design: Pre-fabricated corner units.