Stabilizing Slides Using a Spider Excavator

1. Stabilizing Slides Using a Spider Excavator Eric L Kay Rob Wilson

2. Stabilizing Slides Part 1 - Spider Excavator, (the tool) Part 2 - Landslide Headscarps Part 3 - Multiflow Drainpipe Part 4 - Contour Drainage Eric Eric Rob Rob

3. Kaiser X5 M . Part 1 - Spider Excavator Description J .. .

4. Pushes and pulls itself around Hydraulic thumb Work on steep slopes 100% (One to One slope) Extending stick Twist wrist bucket Walks on 4 legs Hydraulicwinch 12,000lbs Rolls on two back wheels Kaiser X5 M Optional Hydrostatic drive (6kmph)

5. Agility Step over; - Logs - Shrubs - Small trees Schaeff HS 40 D - Boulders

6. Safely work on a 1 to 1 slope Kaiser X5 M

7. Previously deactivated road system site accessibility Schaeff 41 M

8. Perched material in the gully Schaeff 41 M Beyond the reach of a normal excavator

9. The power of an excavator 1 1/2 times the size Schaeff HS 40 D

10. Schaeff HS 40 D Working in water 2 meters deep

11. Transportable by Helicopter For remote site work Fueled and ready to work

12. Part 2 - Landslide Headscarps

13. Retrogressive Failures • Maintenance problems • Destruction of remedial works • Loss of productive land inventory

14. Unstable headscarp

15. Kaiser X5 M

16. Large woody debris Kaiser X5 M

17. Caution      Need good understanding of soils, water and slope processes

18. Part 3 - Multiflow Drainpipe

19. Multiflow pipe Available in 15,30 & 46 cm widths Made up of multiple miniature “Big O” pipes laid flat, joined together and covered in a filter fabric A viable alternative for Drain rock

20. Part 4 - Contour Drainage

21. This site is located in the Cariboo Mountains where a “hanging glacial” valley slopes into a typical “U shaped glacial valley”. Glacial fluvial out-wash deposits are buried below glacial till, resulting in seepage related slope instability problems.

22. A road cut slide, with retrogression of the headscarp and an ongoing maintenance problem.

23. The Spider Excavator digs a trench above the crest of the headscarp The base of the trench should slope at least 2% towards an outlet end of the drainage.

24. The multiflow drainage composite was put into the bottom of the trench, against the uphill slope, and a 6 mil polyethylene sheet against the down slope side.

25. The multiflow drainage composite was put into the bottom of the trench, against the uphill slope, and a 6 mil polyethylene sheet against the down slope side. Alternatively a composite “Blanket Drain” material such as Nudrain DM50 could be employed Excavator starts backfilling the trench. Woody debris is then scattered over top

26. Excavator starts backfilling the trench. Woody debris is then scattered over top

27. 5 liters/min X 60 min/hr X 24 hrs day = 7200 liters/day That’s over 7000 kg less weight on a day to day basis! What difference does a month or two make? Steady seepage from subsurface drainage collector (Multiflow)

28. Finished swale above head scarp with debris scattered over top. (Picture has been stretched to emphasize the swale)

29. Finished drainage swale directing surface run-off along flank of slide area

30. Stable cut slope with reduced seepage after finishing the contour drainage work.

31. Thank You Eric Kay - Rob Wilson

32. References Kaiser X5 M - JOHOE Inc Joe Gisler 250 398-3507 Schaeff HS 40 D - Nu Creek Developments Len Masson 250 833-0173 Schaeff HS 41 M - J W Berry Trucking Brad Berry 250 724-4912 Rob Wilson - Weldwood - 250 392-7731 Eric L Kay - Kay & Associates - 250 337-5096