Settlement Analyses with Incremental, Controlled Gradient and Constant Rate of Strain Load Tests

摘要

A comparative analysis of one dimensional consolidation tests including incremental, controlled gradient and constant rate of strain loading is made. The material tested consisted of an overconsolidated recent alluvial soil. Test results of the controlled-gradient and constant rate of strain tests were compatible with the curve fitting methods, log time and square root of time, of the incremental test. Short comings in the testing techniques and equipment are discussed. The constant rate of strain test is recommended for further consideration. Settlement analyses using the Terzaghi, Janbu and elastic theories are presented. Settlement computations for a bridge embankment using the test results are included for comparison.