胶凝砂砾石材料抗压强度与剪切强度关系研究

发布时间：2018-08-17 08:56

【摘要】：通过胶凝砂砾石材料单轴抗压试验和三轴剪切试验,分析材料的应力应变曲线特征。胶凝砂砾石材料在低应力水平下表现出线弹性性质,随着应力逐步增大进入塑性阶段,直至达到峰值强度,随后随着应变的增大,应力降低,体现出明显的软化特征,最终趋于残余强度。定量分析曲线各阶段特征强度得出,随着围压的增大,胶凝砂砾石材料峰值强度及屈服强度均增大,呈现出较为明显的线性相关性。基于试验数据,建立了三轴试验曲线各特征强度与围压之间的关系,结合三轴试验的应力应变曲线,得到了材料抗剪强度指标值,并拟合材料抗压强度与凝聚力及内摩擦角的曲线函数,建立起三轴试验与单轴试验力学指标之间的对应关系。
[Abstract]:Through uniaxial compression test and triaxial shear test, the characteristics of stress-strain curve of cemented sand and gravel are analyzed. The grit material shows linear elastic property at low stress level. With the increase of stress, it enters the plastic stage until the peak strength is reached, and then the stress decreases with the increase of strain, which shows the obvious softening characteristic. Finally, it tends to residual strength. With the increase of confining pressure, the peak strength and yield strength of cementing sand and gravel material increase, showing a more obvious linear correlation. Based on the test data, the relationship between the characteristic strength and confining pressure of the triaxial test curve is established, and the shear strength index value of the material is obtained by combining the stress-strain curve of the triaxial test. The curve function of compressive strength, cohesion and angle of internal friction is fitted, and the corresponding relationship between the mechanical indexes of triaxial test and uniaxial test is established.
【作者单位】：华北水利水电大学;水资源高效利用与保障工程河南省协同创新中心;
【基金】：水利部公益性行业科研专项(201301025)
【分类号】：TV41

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