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为了了解裂隙性黄土的应力-应变特性及变形破坏机制,通过三轴压缩试验,总结了不同含水量、不同裂隙角度的裂隙性黄土样在不同围压下的应力-应变曲线类型,分析了其变形破坏机制;采用元件组合模型,模拟了裂隙性黄土的应力-应变关系。结果表明:裂隙性黄土的应力-应变曲线有理想弹脆性极强软化型、弹塑脆性强软化型、折线软化型、曲线软化型、复合软化型、弹理想塑性型、理想弹塑性型和弹塑性硬化型共8种类型,其变形破坏机制表现为挤压-滑动、挤压-滑移(蠕滑)、挤压-横向拉裂、弯曲-滑移(或塑流)、弯曲-纵向拉裂和弯曲-旋转或扭转6种;裂隙性黄土的变形破坏方式受土样的含水量、母土性质、裂隙角度和试验围压的控制和影响,采用胶结杆与弹簧、滑片等元件组成的模型可用来模拟土样发生轴向变形时的突发性和渐进式破坏。
In order to understand the stress-strain characteristics and deformation and failure mechanism of fissured loess, the stress-strain curve types of fissured loess samples with different water content and different fissure angles under different confining pressures were summarized through triaxial compression tests. Deformation and failure mechanism; element combination model is used to simulate the stress-strain relationship of fissured loess. The results show that the stress-strain curve of fractured loess has the ideal ideal brittle brittleness type, elastoplastic brittleness softening type, softening curve line, curve softening type, composite softening type, elastic ideal plastic type, ideal elastic-plastic type and elastic There are 8 types of plasticity hardening. The mechanism of deformation and failure is manifested as extrusion-sliding, squeeze-slip (creep), extrusion-transverse rupture, bending-slippage Cracking and bending - 6 kinds of rotation or torsion; the way of deformation and failure of fissured loess is controlled and influenced by the moisture content of soil sample, the nature of mother soil, the crack angle and the test confining pressure. Of the model can be used to simulate the sudden and progressive failure of soil samples when axial deformation occurs.