结构性参数在黄土地基沉降计算中的应用研究

Application of Structural Parameters in Calculation of Loess Foundation Settlement

摘要:

弦线模量法建立了考虑黄土基本物性指标及附加应力综合影响的弦线模量函数，应用分层总和法计算黄土地基的变形量，并在陕西关中黄土地区工程实践中获得良好的预测结果，而在分析兰州等其他黄土地区地基沉降时，结果出现偏差，究其原因，与计算中忽视了天然状态下黄土的结构性特征有关。以弦线模量法为基础，通过西安近郊4处土样试验和大量载荷试验资料，分析黄土的构度指标与压缩模量、孔隙比、含水量的关系，并将构度指标引入弦线模量表，深化结构性参数在地基沉降变形计算中的理论。

Abstract:

Chord modulus method is used to establish chord modulus function considering the basic physical properties of loess and the combined effects of additional stress. Layer-wise summation method is applied to calculate the deformation of the loess foundation. Good prediction results are obtained in the engineering practice of the Guanzhong loess area in Shaanxi Province. However, a different result is obtained when analyzing the settlement of foundations in other loess areas, such as Lanzhou. The contradicting results could be due to the neglect of the structural characteristics of loess under natural conditions. Using chord modulus method, this study evaluates the relationship between the structural index of loess and the compressive modulus, void ratio, and water content. Four soil samples were collected in the urban area of Xi'an, and a large amount of load test data was employed in the analysis. The results validate the theory of structural parameters in the settlement calculation of foundation settlement.