french drains and application in slope.PPTX

in geotechnical process and application

1. Geotechnical Process and Its Application French Drains and Applications in Slope Stability PRESENTED BY: KARTHIKK RAJA M (2201106026)

2. INTRODUCTION NEED OF FRENCH DRAINS CONSTRUCTION OF FRENCH DRAINS WORKING PRINCIPLE APPLICATION IN SLOPE STABILITY ADVANTAGES LIMITATIONS CASE STUDIES/EXAMPLES CONCLUSION ABSTRACT:

3. French drain: gravel-filled trench with a perforated pipe to control subsurface water. Purpose : Collects and redirects groundwater. Importance : Reduces pore water pressure and prevents soil instability in slopes INTRODUCTION

4. Groundwater increases pore water pressure and reduces soil strength. Poor drainage leads to slope failures and landslides . Helps in erosion control and stability of retaining structures. NEED FOR FRENCH DRAINS

5. Excavate trench along slope. Place perforated pipe at base. Surround with gravel or coarse aggregate . Wrap with geotextile filter. Cover with soil and vegetation CONSTRUCTION OF A FRENCH DRAINS

6. Intercepts groundwater seeping through slope . Redirects flow away from slope or structure. Lowers water table and pore water pressure . Increases soil shear strength → stabilizes slope WORKING PRINCIPLE

7. Stabilizing natural slopes prone to landslides . Highway and railway embankments . Behind retaining walls to reduce hydrostatic pressure. Cut slopes in hilly terrains. Drainage in earth dams and embankments APPLICATION IN SLOPE STABILITY

8. Simple and cost-effective solution. Long-term effective groundwater control. Reduces need for heavy retaining structures . Environmentally friendly and reliable ADVANTAGES

9. May clog if not designed with proper filters. Requires maintenance in fine-grained soils . Less effective in impermeable soils like clay. LIMITATIONS

10. French drains in Himalayan road slopes. Landslide-prone regions of Kerala and Uttarakhand. Stabilization of railway embankments Case Studies / Examples

11. CONCLUSION French drains are reliable and low-cost solutions for slope stabilization Improve safety of infrastructure by controlling groundwater. With proper design and maintenance, they effectively prevent slope failures

12. THANK YOU…….