Strength and deformation behaviour of coarse-grained soil by true triaxial tests |
| |
Authors: | Wei-cheng Shi Jun-gao Zhu Chung-fai Chiu Han-long Liu |
| |
Affiliation: | [1]Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China [2]School of Civil Engineering and Architecture, Changzhou Institute of Technology, Changzhou 213002, China |
| |
Abstract: | In order to investigate the influence of intermediate principal stress on the stress-strain and strength behaviour of a coarse-grained soil, a series of true triaxial tests were performed. The tests were conducted in a recently developed true triaxial apparatus with constant minor principal stress σ 3 and constant value of intermediate principal stress ratio b=(σ 2−σ 3)/(σ 1−σ 3) (σ 1 is the vertical stress, and σ 2 is the horizontal stress). It is found that the intermediate principal strain, ɛ 2, increases from negative to positive value with the increase of parameter b from zero to unity under a constant minor principal stress. The minor principal strain, ɛ 3, is always negative. This implies that the specimen exhibits an evident anisotropy. The relationship between b and friction angle obtained from the tests is different from that predicted by LADE-DUNCAN and MATSUOKA-NAKAI criteria. Based on the test results, an empirical equation of g(b) that is the shape function of the failure surface on π-plane was presented. The proposed equation is verified to be reasonable by comparing the predicted results using the equation with true triaxial test results of soils, such as coarse-grained soils in this study, sands and gravels in other studies. |
| |
Keywords: | cohesionless soil coarse-grained soil true triaxial test strength deformation failure criterion |
本文献已被 维普 万方数据 SpringerLink 等数据库收录! |
|