Evaluation of collapsible loess subgrade treated
Different methods were employed to separate the total measured resistance into components generated by the conical tip (the "tip friction and friction generated by the rod string. During testing, if the hammer is not lifted to the standard given height, the impulse force exerted by the cone will be reduced and the values of penetration, in turn, decrease. The magnetometer in the cone detects ferrous materials of 50 kg or larger within a radius of up to about 2 m distance from the probe depending on the material, orientation and soil conditions. National Report on CPT" (PDF).
Apex Angle of the Cone. MGM-134 Midgetman ) soil/structure design program in 1984 at the Earth Technology Corporation of Long Beach, California. One common tool advanced during CPT testing is a geophone set to gather seismic shear wave and compression wave velocities. When the bottom rod of the DCP used is longer than the standard penetrating rod, correction to the dcpi value should be applied because vertical confinement and skin friction around the rod increases resistance to the penetrating rod.
A very early ultra-miniature 1 cm subtraction penetrometer was developed and used on a US mobile ballistic missile launch system (. S, 1965, "The Friction Jacket Cone as an Aid in Determining the Soil Profile Proceedings, 6th icsmfe, Montreal, Quebec, Canada, Vol I,.17-20. Due to this reason, DCP tests are conducted during the post-monsoon seasons when the granular and sub-grade layers become soft and their minimum strength are recorded. Lifting Height of Hammer, during DCP testing, for each blow, the hammer weight should be lifted to the top restraint plate and freely dropped.