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主应力加载方向对土体强度产生影响的根本原因是土体存在各向异性。对于横观各向同性砂土而言,沿不同平面的抗剪强度随该平面与沉积面夹角增大而增大。认为砂土固有各向异性强度与该平面的各向异性参数密切相关,给出了各向异性砂的峰值强度表达式。在SMP准则中,各个潜在滑动面上的剪正应力比相同,各向异性砂土的抗剪强度和滑动面位置由强度最低的潜在滑动面所决定。综合考虑主应力轴、滑动面以及沉积面之间的位置关系,得到了砂土的各向异性强度准则。采用福建标准砂进行了一系列定轴剪切试验,系统地观测了定轴剪切试验中试样滑动面的特征。已有试验数据和理论结果的对比表明,各向异性强度准则可以较好地预测各向异性砂土的强度与滑动面位置。
The root cause of the main stress loading direction on soil strength is the existence of anisotropy of soil. For transversely isotropic sandy soil, the shear strength along different planes increases with the angle between the plane and the sedimentary surface. It is considered that the inherent anisotropy of sand is closely related to the anisotropy parameter of the plane, and the expression of the peak intensity of anisotropic sand is given. In SMP, the shear stress and slip surface of anisotropic sand are determined by the potential shear surface of the lowest strength. Considering the relationship between the principal stress axis, the sliding surface and the sedimentary surface, the anisotropic strength criterion of sand is obtained. A series of fixed-axis shear tests were carried out using Fujian standard sand, and the characteristics of the sliding surface of the sample in the test of fixed-axis shear were systematically observed. The comparison between experimental data and theoretical results shows that the anisotropy strength criterion can better predict the strength and sliding surface of anisotropic sand.