Pebble Strata Construction Solution
High-carry mix designs and hole-control measures for the large cuttings and unstable walls of pebble strata.
Solution overview
- Application methods
- 旋挖灌注桩施工 / 深基础施工
- Problem type
- Strata
Scenario and construction challenges
Drilling in pebble and boulder strata: large cuttings and loose walls demand higher carry and wall protection while controlling diameter and sediment.
Challenge 1Heavy sediment
Large pebble cuttings settle fast, adding clean-out work and risking pile quality.
Challenge 2Collapse risk
Loose pebble walls cannot stand unsupported — any delay in protection brings collapse.
Challenge 3Overbreak
A weak protective layer leads to oversize holes and concrete overpour.
Complete solution
Each scheme pairs materials with dosing; the table below lists material, role and ratio per step.
| Stage | Material | Function | Ratio / dosage | Working condition | Scope |
|---|---|---|---|---|---|
| Make-up | PAM-P for pebble | High-carry main material | 1:250 | Pebble / boulder beds, max size ≤800 mm | Φ800–1500 pile bores |
| Base slurry | BENT-N sodium bentonite | Base make-up | 6%–8% | Fresh-water make-up | Base slurry for high-carry systems |
| Thickening | CMC-N | Raises yield point | 0.3% | Thick bottom sediment, low yield point | Pebble-stratum circulation slurry |
| Maintain | PAM-P top-up | Re-viscosify by returns | As required | Rising cuttings load, falling viscosity | Dosed from return-slurry tests |
Delivered results
Construction schematic & site photos
Use the schematic and site photos to follow the process and slurry flow; final parameters follow on-site trial results.
Construction schematic
Site photos
Related cases
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