0 votes 0 votes The initial concavity in the load-penetration curve of a CBR test is NOT due to uneven top surface high impact at start of loading inclined penetration plunger soft top layer of soaked soil Foundation Engineering gate2018-ce-2 foundation-engineering geotechnical-engineering load-penetration-curve standard-penetration-test + – gatecse asked Feb 17, 2018 • edited May 23, 2021 by Chandanachandu gatecse 4.0k points answer See all 0 reply