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随着国民经济的发展,土工合成材料被广泛应用于边坡和挡墙等实际工程中。筋土界面的界面摩阻力是设计中的关键考虑因素。文中主要分析加筋土界面拉拔状态下的渐进破坏行为,将拉拔过程分成三个阶段:纯弹性阶段,界面的剪切应力与剪切位移呈弹性关系;弹—塑性阶段,通过一个临界点划分弹性区和塑性区;完全塑性阶段。并且给出了各个阶段的拉力、位移和剪应力的解析解。最后通过两组拉拔试验结果与解析计算的比较分析验证了该模型的准确性。对筋土界面摩阻力分布规律进行了详细研究,深入地分析了加筋长度、筋材的弹性模量、剪切刚度和塑性区间长度等因素对加筋土界面的渐进拉拔行为的影响。
With the development of national economy, geosynthetics are widely used in practical projects such as slope and retaining wall. Interface friction resistance at the interface is a key consideration in design. In this paper, the progressive failure behavior of reinforced soil interface under the condition of drawing is analyzed. The drawing process is divided into three stages: in the pure elastic stage, the shear stress in the interface is in elastic relation with the shear displacement; in elastic-plastic stage, Points are divided into elastic and plastic zones; complete plastic phase. In addition, the analytical solutions of tension, displacement and shear stress are given. Finally, the accuracy of the model is verified by the comparative analysis of two drawing test results and analytical calculation. The law of friction and drag distribution at the interface of reinforcement and soil is studied in detail. The influences of the length of reinforcement, the modulus of reinforcement, the shear stiffness and the length of plastic zone on the progressive drawing behavior of the interface are discussed.