INTERNATIONAL SOCIETY FOR SOIL MECHANICS AND GEOTECHNICAL ENGINEERING This paper was downloaded from the Online Library of the International Society for Soil Mechanics and Geotechnical Engineering (ISSMGE). The library is available here: https://www.issmge.org/publications/online-library This is an open-access database that archives thousands of papers published under the Auspices of the ISSMGE and maintained by the Innovation and Development Committee of ISSMGE. The paper was published in the proceedings of the 12th Australia New Zealand Conference on Geomechanics and was edited by Graham Ramsey. The conference was held in Wellington, New Zealand, 22-25 February 2015. Estimation of vertical subgrade reaction modulus from CPT and comparison with SPT for a liquefiable site in Christchurch N. Barounis1, CEng MICE MIPENZ and Brett Menefy2, CertETn, AIPENZ 1Opus International Consultants, 20 Moorhouse Avenue, Christchurch, New Zealand, email:
[email protected] 2Opus International Consultants, 20 Moorhouse Avenue, Christchurch, New Zealand, email:
[email protected] ABSTRACT A methodology introduced in 2013 (Barounis et al.) for estimating the coefficient of subgrade reaction for sands from Cone Penetration Test (CPT) data was applied for a liquefiable residential site in Christchurch. The data gathered from a site investigation comprising of four CPT’s and one borehole with Standard Penetration Test’s (SPT’s). The site consists of relatively uniform soil formations. The results from the CPT’s are compared with the SPT borehole results. The SPT results are analysed by using the methods proposed by Scott (1981) and Moayed and Janbaz (2011). The three methods are applied on different sizes of foundations: square footing, rectangular footing and strip footing.