Site Investigation | Balancing Safety and Cost in the Sale of Newly Built Homes on Embankments
Ground investigation
Thorough analysis of differential settlement risks in subdivided built-for-sale houses on filled land using surrounding environmental and geological data. We achieve optimal foundation design that eliminates waste.
When constructing prefabricated houses on embankment sites such as those created by terracing, there is a hidden risk of significant differential settlement accidents due to the uneven ground bearing capacity within the site and the influence of ancillary structures such as retaining walls and soil supports. Geotech's ground surveys provide a comprehensive risk assessment that goes beyond mere measurements of ground strength. They integrate terrain classification, preliminary investigations of past land history, and on-site inspections to confirm anomalies such as cracks in neighboring houses and deformations of retaining walls. Particularly, vulnerabilities that are often overlooked, such as the boundary between cut and fill (cut-and-fill crossing) and insufficient compaction of backfill soil behind retaining walls, are revealed three-dimensionally through data balance from SWS tests and elevation surveys. The resulting complex data is analyzed from multiple angles by experienced specialized staff, allowing for the calculation of true ground bearing capacity that excludes irregular factors. By preventing the overestimation of ground risks, unnecessary ground reinforcement can be eliminated, strongly supporting "optimal foundation design" that ensures both profit for the prefabricated housing business and reliable safety.
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basic information
The measurement of static penetration resistance using the SWS testing machine serves as the basis for obtaining N-value conversion data at multiple points within the site. In addition, a historical survey using past aerial photographs and topographic maps, as well as on-site leveling surveys (to confirm elevation differences) and visual inspections of the surrounding conditions (to check for abnormalities such as foundation cracks and wall inclinations) will be conducted in parallel. The collected data will be analyzed using specialized programs for settlement calculations based on guidelines for the foundation design of small-scale buildings and for examining bearing capacity by soil type. Ultimately, a qualified analyst will make a comprehensive judgment considering the specific characteristics of each property.
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Applications/Examples of results
It is ideal for ground surveys of newly developed residential areas that have been extensively constructed in mountainous regions and on sloped terrains, as well as for built-for-sale homes in subdivided lands with elevation differences. It demonstrates its effectiveness in sites where there is a strong concern about the risk of differential settlement due to uneven ground, such as those with a mix of cut and fill earthworks or plans to place buildings close to high retaining walls. By meticulously uncovering hidden ground risks, it helps prevent claims and repair costs after handover due to ground accidents, while also reducing unnecessary excessive ground improvement work, thus facilitating decision-making to complete subdivision projects safely and at appropriate costs.
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