陕西泾阳南塬Q3黄土湿陷系数与物理指标相关性分析及其评价模型OA

To accurately and rapidly evaluate the collapsibility of Q3 loess on the South Jingyang Plateau,laboratory tests were carried out to measure its basic physical indexes and collapsibility coefficient.The relationships between collapsibility coefficient and depth,as well as different physical-mechanical indexes,were systematically analyzed.The correlation degrees of each physical index were determined by factor analysis,and evaluation models with different combinations of independent factors were established based on SPSS software.The results show that the collapsibility coefficient of Q3 loess on the South Jingyang Plateau is positively correlated with void ratio and compres-sion coefficient,and negatively correlated with depth,water content,dry density,liquid limit,plastic limit,plasticity index and liquidity index.The physical indexes can be divided into three relatively independent factors:water content,saturation and liquidity index;void ratio and dry density;liquid limit,plastic limit and plasticity index.The evaluation model of loess collapsibility coefficient established by using void ratio,water content and plasticity index is better,with small error between calculated and measured values,which can be used for the collapsibility evaluation of Q3 loess on the South Jingyang Plateau in the future.There is a correlation between loess collapsibility and its physical indexes,and establishing an evaluation model of loess collapsibility coefficient by mathematical statistics is an important way to simplify its engineering application.