Estimating Soils Mohr-Coulomb Strength Parameters from Soil In-Situ Density Data

[gianniorlati]

BEARING CAPACITY OF PILE FOUNDATIONS BASED ON CPT RESULTS IN ACCORDANCE TO POLISH STANDARDS AND EUROCODE 7

• Author(s): Bartlomiej Czado, Bogumil Wrana
  
• Published By: AGH Journal of Mining and Civil Engineering
  
• Published Year: 2012
  
• Size: 46.10 MB
  
• Quality: Original Preprint
  
• Abstract: The results of the cone penetration test (CPT) are widely applicable in calculations of bearing capacity of foundation piles [1]. During the test two basic parameters were measured:
  cone tip resistance qc and shaft friction fs.
  The results may be used indirectly — in the first stage for the soil properties recognition (determination of the soil names), then for the determination of soil density or consistency parameters ID and IL and in particular soil strata. This approach may be applied to the pile design in accordance with Polish Standard PN-83/B-02482 [4] as soil type and the density/consistency parameter value are in this case the basis for the determination of soil unit resistances.
  On the other hand, the possibility of the direct use of the CPT results for thedetermination
  of compressive resistance of an axially loaded single pile is described in Part 2 of the
  Eurocode 7 [7], concerning ground investigation and testing procedures.
  Examples of calculating methods are presented in Annexes D.6 and D.7 of this standard.
  For those methods a precise recognition of soil type is not necessary.
  The results of the cone penetration test in the procedure of Polish Standards can be used for the isolation of soil zones in which measured parameters have similar values.
  This leads to relatively precise soil classification (determination of soil name) and separation of the geotechnical strata.
  For this purpose a modified Robertson’s chart [2] is used, which has been adapted for Polish soil names in the PN-B-04452:2002 standard [5] (Fig. 1).
  Polish Standard presents correlation formulas to assess the CPT tip penetration resistance qc based on the values of ID or IL.
  
  ----------------------
  
  Attached is also the reference standard; the method is very used in central-eastern Europe for the design of deep foundations and sheet-pile walls.
  Report from Mayne and Kulhawy (1990) may be used to estimate the values of the effective internal friction angle and of the effective cohesion in the framework of the Mohr-Coulomb failure criterion.
  

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[Grunf]

The file contains two following documents in PDF:

PN-B-04452 - 2002 - In-Situ Soil Testing (in Polish)

and

Czado - Wrana - Piles Bearing Capacity based on CPT Results

[BennyP]

Hard to believe. More than five years in forum, 9 warnings until now (without the last one for posting against our rule no.13). And it was a comment about the same in his profile years ago but somehow some users never learn. Only 20% even if must be 30% for repeating the same fault. Almost all warnings are for repeating the same other faults as wrong section, quoting etc...Dear gianni you are near the limit.