Site Investigation | Research to Balance Safety and Cost in Subdivided Built Homes on Embankment Areas
Ideal for subdivided built-for-sale houses on filled land! By using SDS testing and our unique analysis criteria, we reduce excessive ground reinforcement while preventing settlement risks.
When constructing subdivided built-for-sale houses on embankment land, the balance between the risk of differential settlement due to uneven compaction of the fill and the high costs of ground reinforcement driven by fear of that risk becomes a significant challenge. The ground investigation solution proposed by Geotech utilizes unique high-precision technology and a vast database to maximize both safety and cost-effectiveness. The investigation employs the SDS (Screw Driver Sounding) test, which can automatically identify soil types and accurately capture the characteristics of cohesive and granular soils through torque measurement. In terms of analysis, in addition to regulatory standards, a unique criterion evaluating "strength, shrinkage, and deformation" based on three items and eight elements is applied. By combining settlement simulations that cover stress propagation at depths of 2m and 5m with evaluations of the years since the embankment was created, we derive an "optimal foundation design" that eliminates excessive columnar improvements and pile work. By issuing ground assessment reports based on objective and reliable evidence, we strongly support the cost optimization and long-term safety assurance of the subdivided built-for-sale housing business.
basic information
The SDS (Screw Driver Sounding) test is the main focus, using a fully automated survey machine to digitally record load, rotation speed, and maximum and minimum torque every 25 cm. This allows for automatic classification of soil types underground, in addition to measuring penetration resistance. The analysis considers stress distribution at 2 meters (direct influence range) and 5 meters (reduced influence range) below the foundation, calculating long-term allowable stress and differential settlement. Design judgments are made based on a unique evaluation of three items and eight elements related to "soil strength, contraction, and deformation," along with a comparison to an in-house database of 100,000 cases annually.
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Applications/Examples of results
It is ideal for foundation ground surveys of newly built subdivided houses and wooden single-family homes in areas with filled soil and hilly development. It demonstrates its effectiveness in preventing increased construction costs due to excessive ground improvement work in sites with uneven fill or subsidence layers, and in selecting appropriate foundation specifications (such as slab foundations, strip foundations, surface improvement, etc.). Additionally, precise settlement simulations based on soil classification data are widely used for smooth passage of ground guarantees and insurance reviews, as well as explanatory materials for home buyers.
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