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为探索黄土处理后取样测定湿陷性的合理时间节点,以重塑黄土的含水量、干密度和龄期为因素,设计混合均匀试验方案,研究多因素耦合条件下龄期对重塑黄土湿陷性的作用规律.应用最小二乘拟合,建立湿陷系数与含水量、干密度、龄期的非线性回归数学模型.结果表明,影响湿陷系数的主要因素是干密度,其次是含水量和龄期;含水量和干密度的作用为负效应,龄期的作用为正效应.龄期干密度的交互作用为正效应,龄期含水量、含水量干密度的交互作用为负效应;交互作用的因素主次顺序为龄期干密度、龄期含水量、含水量干密度.取样测定湿陷性的合理时间节点与扰动黄土土样的干密度和含水量有关.试验所选水平范围内,龄期大于21d后,湿陷系数均基本趋于稳定,可取21d作为扰动黄土测定湿陷性的合理时间节点.
In order to explore a reasonable time node for sampling and determining collapsibility after loess treatment, the experiment was designed to reshape the water content, dry density and age of loess, and to study the effect of different age conditions on the wettability of remodeled loess The nonlinear regression model of collapsibility coefficient, water content, dry density and age was established by least-square fitting method.The results showed that the main factor affecting the collapsibility coefficient was dry density, followed by that containing Water content and age, the effect of water content and dry density was negative effect, and the effect of age was positive effect.The interaction of age dry density was positive effect, the interaction of age water content and dry density of water content was negative effect ; The order of the interaction factors is the dry density of age, water content of age, dry density of water content.The reasonable time node for sampling and collapsing loess sample is related to the dry density and water content of soil samples.The level Within 21 days, the collapsibility coefficient basically stabilized after 21 days of age. It is advisable to use 21 days as a reasonable time node for determining the collapsibility of loess.