Engineering Drawing - Rock Wall Mesh West Perimeter / Soil Retaining Wall West Perimeter

ROCK WALL/SOIL STABILIZATION

Proposed Residential Development - 1938 West Park Lane, View Royal, B.C.

Project Information

• Client: Seymour Pacific Developments Ltd.
• Engineering Firm: RYZUK GEOTECHNICAL Engineering & Materials Testing
• Drawing No: 7877-7-1
• Date: March, 2020
• Status: ISSUED FOR DISCUSSION: 2020-03-26
• Drawn By: CPAS
• Scale: NTS

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SECTION - Rock Wall Mesh West Perimeter

Engineering diagram illustrating rock mesh stabilization on a fractured bedrock slope.

• Property Line (P/L)
• Anchorage System:
  • Auxiliary cable and Auxiliary anchor (see detail F).
  • Galvanized main anchor with eye nut for connection of mesh and top suspension cable. Minimum rock embedment of 2.0 m and 1.0 m stickup. Angle: 10° max.
  • Galvanized anchor plate and nut.
  • Local rock support anchors (galvanized) to stabilize unstable blocks, 3 m embedment.
• Slope Characteristics:
  • Fractured in-place bedrock.
  • Existing, unstable rock slope (approximate).
  • Approximate height: 12 m.
• Containment and Catchment:
  • Rock mesh covering the slope face.
  • Catchment area height: 1.2 m.
  • Catchment to be inspected seasonally and cleaned when more than 20% full by height.
  • Lock-block concrete or alternate wall to provide adequate catchment width behind. Wall height: 1.2 m.
  • Fence by others.
  • Finished parking grade.

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SECTION - Soil Retaining Wall West Perimeter

Engineering diagram illustrating a lock-block retaining wall with geogrid soil reinforcement.

• Property Line (P/L)
• Excavation and Backfill:
  • Backfill comprising blast rock to be sloped at 1.5H: 1V. If soils, 2H: 1V.
  • Temporary excavation cutslope.
  • Backfill to consist of approved granular material compacted to 95% Standard Proctor Maximum Dry Density (SPMDD).
• Reinforcement:
  • Geogrid length = 0.75H (where H is the wall height).
  • MiraGrid 10XT or equivalent geogrid layers.
• Construction Details:
  • Concrete wedge to connect the bottom up to 3 block courses. Dowels should have a depth into the blocks and bedrock a minimum 0.2 m with 15 M bar with hook.
  • Concrete pour to be staged such that height of concrete does not exceed 2 blocks at a time.
  • Base preparation: Place block on existing well-compacted blast rock fill, native hard glacial till, or concrete leveling pad upon such. If fill, the subgrade is to be recompacted after bulk excavation is completed.

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DETAIL - Block and Rock Anchors

Lock-Block Rebar Anchor Detail

• 15M rebar anchors to be installed in back side of lock-block.
• Two per lock-block spaced evenly at half lock-block height.
• Non-shrink microsil grout or approved equivalent.
• Hole/anchor to be inclined or measures to be taken to avoid grout loss.
• Indicated dimensions: 0.1 m, 0.2 m, 0.3 m.

Rock Anchor Detail

• 15M rebar rock anchors. Size and spacing to be determined based on observed rock quality.
• Depth to be determined based on rock quality.
• Non-shrink microsil grout or approved equivalent.
• Hole/anchor to be inclined or measures to be taken to avoid grout loss.
• Indicated dimensions: 0.1 m, 0.3 m.

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Notes:

1. Mesh and rock anchor locations to be confirmed with Ryzuk Geotechnical on site following hydro-scaling.
2. Actual lock-block retaining wall height will be determined at the time of construction based on the encountered conditions.