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.
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Foundation item: Project(50639050) supported by the National Natural Science Foundation of China and Er-Tan Hydraulicpower Limited Company; Project (50579014) supported by the National Natural Science Foundation of China; Project(09KJD560003) supported by the Natural Science Foundation of Jiangsu Higher Education Institutions of China; Project(BK2007582) supported by Jiangsu Provincial Natural Science Foundation of China; Project(20070294002) supported by the Specialized Research Fund for the Doctoral Program of Higher Education of China; Project(GH200904) supported by Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, China
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Shi, Wc., Zhu, Jg., Chiu, Cf. et al. Strength and deformation behaviour of coarse-grained soil by true triaxial tests. J. Cent. South Univ. Technol. 17, 1095–1102 (2010). https://doi.org/10.1007/s11771-010-0602-5
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DOI: https://doi.org/10.1007/s11771-010-0602-5