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FGG GREGG IN SITU � Environmental and Geotechnical Site Investigation Contractors GREGG IN SITU CPT Interpretations as of July 31, 2002(Release 1 20c) GREGG IN SITU's interpretation routine provides a tabular output of geotechnical parameters current published CPT correlations and is subject to change to reflect the current state of Practice interpreted values are not considered valid for all sod p meters based on guide for geotechnical use and should be carefully scrutinized for consideration in e p tree The design Reference to current literature is strop recommended types The interpretations are presented only as a DRILLING & TESTING Inc do not warranty the correctness or the applicability of any geotechnical geotechnical 9IY ommended GREGG IN SITU, Inc and GREGG parameters interpreted by the program and can not assume liability for any use of the results r or review Representative hand calculations should be made for an y f the geO#echnical purposes The end user of the interpreted output should also be fully aware of the techniques n any design limitations of any method used in this program The purpose of this document parameter that is critical for design m the user as to which methods were used and what thea q and the appropriate papers and/or Publicationsiare for further reference and The CPT interpretations are based on values of tip, sleeve friction g user specified interval (e g 0 20m) Note that q, is the recorded ti value re pressure averaged over a have equal end area friction sleeves Fs, are not required p � q�, to sleeve friction, corrected for pare pressure effects Since all GREGG IN SITU cones h , pore pressure corrections The tip correction is qi;qc 4(y-a) .U2 where qi Is the corrected tip resistance qc is the recorded tip resistance uz is the recorded dynamic pore pressure behind the#r a is the Net Area Ratio for the cone (typically 0 85 for GREGG IN SITU cones) The total stress calculations are based on soil unit weights that have been assigned to the Sod Behavior9 Type zones, from a user defined unit weight profile or by using a single value throughout the profile Effective vertical overburden stresses are calculated based on a hydrostatic distribution Pore pressures below the water table or from a user defined equilibrium pore pressure profile (this obtained from CPT dissipation tests) For over water projects the effects of the column of equilibrium r a e been taken in to account as has the appropriate unit uveight of water How this is done de can be the instruments were zeroed (i a on deck or at mud line) water have ' pends on where Details regarding the interpretation methods for all of the interpreted parameters arero The appropriate references cited in Table 1 are listed in Table 2 Where methods are based on charts or ' techniques that are references too complex to describe in this summa p vided in Table 1 Summary the user should reference to the cited The estimated Soil Behavior Types (normalized and non-normalized) are based on the charts developed by Robertson and Campanella shown in Figures 1 and 2 Where the results of a calculation/interpretation are declared `rnvalyd'the value wilt be re C text strings "-9999" or"-9999 0" Invalid results will occur because of(and not limited to combination of presented by the one or a I Invalid or undefined CRT data (e g drilled out section or date gap) 2 Where the interpretation method is inappropriate, for example, drained parameters i undrained material (and vice versa) n an 3 Where interpretation input values are beyond the range of the referenced charts or specified limitations of the interpretation method 4 Where pre-requisite or intermediate interpretation calculations are invalid