英文摘要 |
Apparent cohesion is the most widely used strength parameter of unsaturatedsoils that reflect the influence of matric suction, but it is not easyto obtain. A rather complicated strength test is needed. Hence, this studyinvestigates the feasibility of adopting test results of the unconfined com- pression strength to assess the apparent cohesion of unsaturated lateriticsoil. A series of laboratory tests were conducted, including unconfinedcompression strength and a triaxial test of unsaturated compacted lateriticsoil. In specific, the unconfined compression test was combined with filterpaper test to obtain the unconfined compression strength and matric suctionof the samples. Soil samples were first compacted at a designated water contentand then subjected to drying and wetting using an apparatus developedby the authors. As a result, the correlations among the matric suction, theunconfined compression strength and the apparent cohesion can be studied.Based on the extended Mohr-Coulomb criterion, a simple analysis method isestablished, which uses the apparent cohesion of unconfined compressionCuc to evaluate the unsaturated triaxial apparent cohesion C value. Test resultsshow that the relationship between C and Cuc value is an approximatelinearly increase, the proportion function value is about 0.65 to 1.04.Therefore, the apparent cohesion can be reasonably assessed using the apparentcohesion derived from the unconfined compressive test with propermodification. The method presented in this paper exhibits high practicalpotential. |