Geotechnical investigation and testing reports Drilling and sampling reports

Sampling methods and groundwater measurements are covered by EN ISO 22475, details of which are given in Chapter 4.

EN ISO 22475-1 sets out the requirements for reporting the results of drilling, sampling, and groundwater measurements. Figure 16.2 summarizes the common features of these reports.

Figure 16.2. Contents of a drilling and sampling report

These reports are similar to those defined in Section 7 of BS 59302 and represent typical good practice for reporting borehole data.

16.2.2 Field investigation reports

By the beginning of 2008, international (ISO) standards for geotechnical field testing have been published for the standard penetration test and the dynamic probe only (EN ISOs 22476-2 and -3). Further standards are in development for electrical cone and piezocone penetration tests; Ménard, self-boring, and full displacement pressuremeter tests; flexible and flat dilatometer tests; borehole jack test; field vane test; weight sounding test; Lefranc permeability test; water pressure test in rock; and pumping tests.

Details of these standards are given in Chapter 4. The publication of EN ISOs 22476-2 and -3 has led to the corresponding sections of BS 1377,3 covering standard penetration and dynamic probe tests, being withdrawn in 2007.

The various parts of EN ISO 22476 set out the requirements for the reports that must be produced during and after the field test. Figure 16.3 summarizes the common features of these reports. The field report, which is prepared at the test site, must give a summary log of the ground conditions encountered and record the measured values and test results obtained, in such a way that third parties can understand and check the results.

Figure 16.3. Contents of a field investigation report

General information includes the names of the client and contractor; the project name, location, and number; and the name and signature of the test operative. Information on test location includes borehole number, a sketch of the site, and test coordinates relative to a known position. The method of drilling and the make, model, and physical characteristics of the equipment must be included in the field report, together with details of the procedure followed (date of test, reasons for an early end of the test, backfilling of the borehole, etc.). Finally, the actual measurements obtained must be recorded in a format suitable for checking.

The test report includes the field report, either in its original or electronic format, together with graphs showing (uncorrected) test results and, if necessary, corrected results. Information about the corrections applied and limitations of the data (irrelevant, insufficient, inaccurate, or adverse results) must also be recorded. The report must be signed by the field test manager.

16.2.3 Laboratory test reports

International technical specifications for laboratory testing of soil (ISO TS 17892) were published in 2003 and renewed recently for a further three years. They cover the determination of water content, density of fine-grained soils, particle density using the pyncometer, particle size distribution, permeability, and Atterberg limits. Plus the fall cone test, unconfined compression tests on fine-grained soils, unconsolidated undrained and consolidated (drained) triaxial compression tests, and direct shear tests. Further details are given in Chapter 4.

Figure 16.4. Contents of a laboratory test report

The various parts of ISO 17892 set out the requirements for the reports that must be produced during and after the laboratory test. Figure 16.4 summarizes the common features of these reports.

The laboratory test specifications have not been welcomed in the UK, which currently has a technically superior standard in BS 1377.4 While the ISO documents retain their Technical Specification (TS) designation, they do not have to be adopted in Member Countries of the Committé Européen de Normalisation (CEN) and the British Standards Institution has decided not to publish them yet, pending a final decision on their status.

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