Stabilizing Slides Using a Spider Excavator Eric L

Stabilizing Slides Using a Spider Excavator Eric L Kay Rob Wilson

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

Kaiser X 5 M J. . Part 1 - Spider Excavator Description

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 Hydraulic winch 12, 000 lbs Rolls on two back wheels Optional Hydrostatic drive (6 kmph) Kaiser X 5 M

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

Kaiser X 5 M Safely work on a 1 to 1 slope

Previously deactivated road system site accessibility Schaeff 41 M

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

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

Schaeff HS 40 D Working in water 2 meters deep

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

Part 2 - Landslide Headscarps

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

Unstable headscarp

Kaiser X 5 M

Large woody debris Kaiser X 5 M

Caution Need good understanding of soils, water and slope processes

Part 3 - Multiflow Drainpipe

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

Part 4 - Contour Drainage

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.

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

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.

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.

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 DM 50 could be employed Excavator starts backfilling the trench. Woody debris is then scattered over top

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

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

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

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

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

Thank You Eric Kay - Rob Wilson

References Kaiser X 5 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