不同地貌黄土的物理力学特性和湿陷性评价

Study on Physical and Mechanical Properties and Evaluation of Collapsible Loess of Different Landforms

地形地貌对黄土的堆积产生了重要的作用,使得不同地貌条件下黄土的物理力学特性显现出不同的特性。通过对甘肃陇东、陇西一定区域内不同地貌黄土的室内工程试验与分析发现,同一取样区不同地貌黄土的物理力学性质在古土壤层以上范围内具有一定的规律性。运用黄土物理力学指标与湿陷系数的线性相关性分析和主成分分析,结合非线性拟合方法可得到不同地貌黄土的湿陷性评价方程。通过将不同地貌黄土湿陷系数的预测值与实测值进行对比分析,验证了该评价方程的准确性和合理性。最后,依据黄土干密度与孔隙比之间拟合幂函数的关系式,解决了评价方程量纲不统一的问题。

Landform has an important effect on loess accumulation, so physical and mechanical properties of loess under different terrain conditions exhibit different characteristics. This paper conducts indoor experi ment and statistical distribution and analysis of loess of different landforms in the east and west regions of Gansu Province,revealing that the physical and mechanical properties of loess of different landforms in the same sampling area have a certain regularity above the ancient soil layer. Then, based on linear correlation analysis and principal component analysis of physical mechanics index and collapsibility coefficient of the loess,the paper obtains the collapsibility evaluation equation of the loess of different landforms by combi ning the nonlinear fitting method. Next,the paper verifies the accuracy and rationality of the evaluation e quation by comparing the calculated with the measured values of the loess collapsed coefficient. Finally,ac cording to the fitting power function between the dry density and the void ratio of the loess, the paper solves the problem that the dimension of evaluation equation is not uniform.