Case Study I

Sharper Subsurface Insight with High-Resolution Resistivity Imaging

Why High-Resolution ERT? When engineering decisions depend on exact layer boundaries, conventional resistivity inversions can blur stratigraphy and drift away from borehole ground truth. In this riverbank protection dike project in Khon Kaen, High-Resolution processing produced a clearer model that aligned with borehole-defined interfaces and improved confidence in estimating the depth to very dense sand.

• • Side-by-side comparison: conventional vs. High-Resolution inversion
• • How a 23 ohm·m boundary tracks the clay–dense sand interface
• • What changes between chainage 0+150 and 0+200—and why it matters

Case Study II

Application of Electrical Resistivity Survey to Enhance the Resolution of Subsurface Interpretation

Enhance the resolution of subsurface interpretation by integrating borehole data with Electrical Resistivity Tomography (ERT), enabling clearer visualization of spatial variability in soil layers, reducing the risk of misinterpretation, and supporting foundation engineering design that better matches actual ground conditions. From case studies of riverbank protection dikes along the Chao Phraya River and the Ping River, the survey results helped identify anomalous zones that borehole data may not fully capture, allowing more accurate decisions on adjusting investigation plans and design.

• • Enhances the resolution of subsurface characterization by clearly capturing lateral variability of soil/stratigraphic layers, beyond what can be achieved using boreholes alone.
• • Reduces the risk of misinterpretation when boreholes coincide with or straddle anomalous zones, and helps delineate the confidence limits of investigation results.
• • Supports informed decisions on revising investigation plans and design, thereby reducing the likelihood of damage during construction and throughout the service life.