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|Title:||Improving site characterization for rock dredging using a drilling parameter recorder and the point load test|
|Authors:||Dredging Research Program (U.S.)|
Smith, Hardy J.
Point load testing
Unconfined compressive strength
|Publisher:||Geotechnical Laboratory (U.S.)|
Engineer Research and Development Center (U.S.)
Abstract: Two technologies are further developed to improve site characterization for rock dredging. A system for recording and analyzing the operational parameters of an exploration drill rig is described. Observed drilling parameters can be correlated with site conditions. The basic system, involving proven concepts and applications for land surface use, has been demonstrated in subaqueous applications at several dredge sites. The interpretive techniques that have been developed involve site-specific correlations and calculated combined-parameter estimates of in situ conditions, such as estimates of unconfined compressive strength. The point load test was originally intended for testing of hard rock materials to obtain a field strength index. To support the dredging use of the point load test, a comparative testing program was conducted, involving point load and unconfined compressive strength tests. Applicability of the point load test is shown for weak rock materials typical of many coastal deposits, and a correlation with unconfined compressive strength is demonstrated for several dredge sites, but indicating correlation factors much lower than those used for hard rock tunneling and mining applications.
|Appears in Collections:||Technical Report|