Frequently Asked Questions
Straightforward answers about deep soil densification, micro-pile installations, and chemical grout injection for heavy plant construction.
What is deep soil densification and when is it needed?
Deep soil densification increases the density of loose granular soils using vibro-compaction or dynamic compaction. It is typically required before placing heavy plant foundations on hydraulic fills, loose sands, or reclaimed land where bearing capacity is below 150 kPa. The process reduces settlement risk and liquefaction potential without deep piles.
How do high-pressure micro-piles work in fractured rock?
High-pressure micro-piles are small-diameter drilled and grouted piles installed through unstable overburden into competent bedrock. Grout is injected under pressures up to 5 MPa to bond the pile to the surrounding ground. They are used where access is limited or where conventional piling would disturb sensitive slopes or existing structures.
What types of chemical grout do you use for injection?
We use sodium silicate and acrylate-based formulations for permeation grouting in silty sands and fine-grained soils. The choice depends on soil permeability, groundwater conditions, and required strength gain. Acrylate grouts offer faster gel times and lower viscosity, while sodium silicate is more economical for larger treatment volumes.
How long does a typical grout injection program take?
Duration depends on treatment volume and site access. A 800-square-meter zone at 6-meter depth can be completed in 3 to 5 days with a two-crew operation. Rail possession windows or night work may extend the schedule. We provide a detailed program timeline after the site investigation phase.
Do you provide post-treatment testing and verification?
Yes. We perform cone penetration tests (CPT), pressuremeter tests, and load tests on micro-piles to verify achieved bearing capacity. For grouting, we use inclinometers and settlement monitoring during and after treatment. All results are documented in a geotechnical verification report.
What site information do you need to prepare a proposal?
We need existing borehole logs, soil classification data, groundwater levels, and the proposed foundation loads. If preliminary data is unavailable, we can arrange a site investigation including trial pits and SPT borings. Contact us to discuss your project stage and we will advise on the minimum required information.