论文部分内容阅读
黄土自重湿陷量计算值与实测值往往存在较大差异,黄土自重湿陷系数室内测定方法存在理论上的不足是产生这种差异的主要原因之一,改进和完善黄土自重湿陷系数测定理论和方法已成为正确评价黄土地基的迫切要求。在前期研究的基础上,以土的干密度、含水量、粒间作用和天然自重压力等为因素,对影响黄土自重湿陷系数的因素进行试验研究。将改进法与现行室内方法测定的自重湿陷系数的比值Rc与因地区土质而异的修正系数β0进行比较,分析改进法的合理性,探索各因素对二者测定结果差异的作用规律。研究表明:上覆土压力、土的干密度、含水量和粒间作用对Rc均有不同程度的影响,干密度是最重要的影响因素,含水量和上覆土压力次之,粒间作用最小。改进法可减小土样扰动对自重湿陷系数测定值的影响。
The calculated value of self-contained loess weight tends to be quite different from the measured value. The theoretical deficiencies of loess weight self-weighting collapse coefficient are one of the main reasons for this difference, and the theory of loess self-weight collapse coefficient is improved and perfected And methods have become urgent requirements for the correct assessment of loess foundations. Based on the previous studies, the factors influencing the collapsibility coefficient of the weight of loess were studied by factors of dry density, water content, intergranular action and natural self-weight of soil. The ratio of self-weight collapsing coefficient (Rc) measured by the improved method and the existing indoor method is compared with the correction coefficient (β0) which is different from the soil quality of the area. The rationality of the improved method is analyzed and the effect of each factor on the difference between the measured results is explored. The results showed that overlying soil pressure, soil dry density, water content and intergranular effect had different effects on Rc. Dry density was the most important factor, followed by water content and overlying soil pressure, with the lowest interparticle effect. The improved method can reduce the influence of disturbance of soil sample on the determination of collapse coefficient of self weight.