Pénétromètre à cône dynamique (DCP)

Thanks to its dual-mass impact mechanism, it enables stable and precise measurements in both soft and relatively stiff soil layers. The DCP consists of a steel body, a conical tip, a measuring scale, and a hammer of standard weight that is dropped from a fixed height. With each drop, the hammer transfers its energy through the rod to the soil, allowing the conical tip to penetrate the ground. The recorded penetration per blow (mm/blow) is directly correlated with the soil’s relative density. From these measurements, California Bearing Ratio (CBR) values or equivalent bearing capacity parameters can be calculated. The device features a 60° hardened steel cone, hardened connecting rods, an ergonomic handle, and a clearly readable millimetric scale, making it well-suited for field use. Its modular structure allows easy transport and assembly, and the entire unit can be set up within minutes. During testing, sudden changes in penetration rate at different depths allow easy identification of different soil types (e.g., stiff clay, loose sand, or gravel transitions). Additionally, optional mechanical or electronic counters can be used to record blow count and penetration values. This device is widely used in engineering projects to evaluate in-situ soil properties, determine layer boundaries, and control backfill quality. It provides accurate, rapid, and repeatable results, making it a reliable solution for field investigations.