XSP(Experimental Static Penetrometer) Cone Penetrometer: A Performance Evaluation

摘要

A lightweight seafloor soil test device has been developed that is capable of performing in-situ cone penetration tests (CPT) to 40-foot sediment depth in up to 200-foot water depths. This device, called the XSP (experimental static penetrometer), weights 10,000 pounds and stands 50 feet tall. The water-jetting system, a unique feature, assists penetration to greater depths than is possible with the 10,000-pound reaction force available. The performance of the XSP has been evaluated in approximately 60 at-sea tests, and the penetrometer has proven reliable and produces repeatable data, which compare favorably with cores taken at the test sites. The water-jetting system aids penetration but does not effect the data. These XSP-supplied CPT data can be used to determine soil classification, relative density and friction angle in sand, and undrained shear strength in clay. They can also be used in the design of foundations (especially pile desi gn) and in bearing capacity and settlement calculations.