溜砂坡抗剪强度参数估算模型实验研究

Experimental Research on Shearing Strength Parameters Estimation Model of Talus Slope

为揭示溜砂坡抗剪强度参数与其控制因素间的内在联系,配制五种不同级配样品,计算五组样品的浑圆度、细颗粒含量、不均匀系数和曲率系数。分析控制因素对溜砂坡抗剪强度参数的影响:黏聚力和内摩擦角分别与不均匀系数、曲率系数呈正比关系;黏聚力和内摩擦角均随颗粒的浑圆度的增大而增加;黏聚力和内摩擦角均随细颗粒含量的增大而减少。并绘制出关系曲线,刻画控制因素与抗剪参数间的内在规律性。最后通过多元线性回归理论,构建出简洁、快速的溜砂坡抗剪强度参数估算模型,并通过野外取样,验证了此估算模型的准确性。

In order to reveal the internal relationship between the shearing strength parameters and their control factors, this paper carried an experiment which focused on the flowing factors of shear strength: non-uniform degree, curvature coefficient, round degrees and fine particle content, experimental results indicate that those factors have great effects on shear strength. The cohesion and internal friction have positive relative with non-uniform degree and curvature coefficient. The cohesion and internal friction increase with round degrees. Along with the increase of fine particle content, the cohesion and internal friction are reducing. The relation curve was acquired based on the results, and the inherent law between the control factor and the shearing parameters was determined. Finally, linear fitting is conducted for the four factors. The obtained formula can be applied to the estimation of the cohesion and internal friction of sliding sand slope.