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中文摘要：
以便在压力紧张和纹理粗糙的土壤的力量行为上调查中间的主要应力的影响，一系列真 triaxial 测试被执行。测试与经常的次要的主要应力在一台最近发达的真 triaxial 仪器被进行 3 并且中间的主要压力比率 b= 的经常的价值(2 3 )/(1 3 )(1 是垂直压力，并且 2 是水平压力) 。中间的主管拉紧，这被发现， 2，增加从对有到在一个经常的次要的主要压力下面的统一的从零的参数 b 的增加的积极价值否定。次要的主要紧张， 3，总是是否定的。这暗示标本展出明显的 anisotropy。在从测试获得的 b 和磨擦角度之间的关系与由 LADE-DUNCAN 和 MATSUOKA-NAKAI 标准预言了那不同。基于测试结果，是飞机上的失败表面的形状功能的 g (b) 的一个实验方程被介绍。建议方程被验证由用方程把预言的结果与土壤的真 triaxial 测试结果作比较合理，例如在在另外的研究的这研究，沙和石子的纹理粗糙的土壤。
英文摘要：
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 σ3 and constant value of intermediate principal stress ratio b=（σ2-σ3）/（σ1-σ3） （al is the vertical stress, and % is the horizontal stress）. It is found that the intermediate principal strain, ε2, 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, ε3, 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 re-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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Elasto-plastic Constitutive Model of Soil-Structure Interface in Consideration of Strain Softening a
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