Abstract
Subsurface characterization is essential for a successful infrastructure design and construction. This paper demonstrates the use of an instrumented cone penetrometer (ICP) for a dense layer characterization at two sites. The ICP consists of a cone tip and rods equipped with an accelerometer and four strain gauges, which allow dynamic driving, in addition to quasi-static pushing of the cone. The force and velocity of the cone are measured using the ICP instrumentation and compared with the N value, dynamic cone penetration index, and static cone resistance. A strong correlation has been observed between the total cone resistance estimated from the ICP and the dynamic cone penetration index and static cone resistance. After the correction of the dynamic cone resistance effect, the static component of the total cone resistance can be used as an alternative to a static cone resistance. This novel approach of soil resistance estimation using the ICP may be useful for dense layer characterization.
Highlights
One of the most important stages needed to achieve successful infrastructure design and construction is subsurface characterization
The instrumented cone penetrometer (ICP), which can detect the dynamic responses at the cone tip, was employed for dense layer characterization and soil resistance estimation
Using the dynamic response of the cone tip of the ICP, the total cone resistance was proposed as a soil resistance index
Summary
One of the most important stages needed to achieve successful infrastructure design and construction is subsurface characterization. The standard penetration test (SPT) is conducted by dropping a hammer with a weight of 623 N from a height of 760 mm on top of an anvil connected to the rods. Modification of the cone penetrometers is required for the characterization of deep and dense layers of intermediate geomaterials. Instrumentation of a large-sized cone penetrometer can be a promising method for a prompt and quantitative dense layer characterization. This study presents the development of a new cone penetrometer incorporated with a drilling rig exhibiting high availability for dense layer characterization. It suggests the use of a new index of soil resistance obtained from the dynamic response of the cone tip. The test results obtained at two sites are presented, and several correlations of the soil resistance index newly suggested by using the ICP are discussed
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