晋中平原区粉质黏土标贯击数与压缩模量的关系研究

Study on the Relationship Between Standard Penetration Number and Oedometric Modulus on Silty Clay at Jinzhong Plain

铁路客运专线对工后沉降要求严格,而实际沉降计算过程中,常忽略天然土层的上覆压力对土体压缩模量的影响。依托拟建太原至焦作城际铁路项目,将晋中平原区粉质黏土层现场标贯试验数据进行修正并与室内压缩试验结果进行对比分析。结果表明粉质黏土的压缩模量与标贯击数(修正值)在同一压力范围内呈线性正相关关系,且线性拟合关系式的拟合优度达到0.924以上。通过对上述线性拟合关系式进一步分析,建立该地区粉质黏土压缩模量与标贯击数及压力值三者之间的关系模型,并通过实例验证了关系模型对该地区粉质黏土层的适用性,可为该地区工程建设过程中相应土层的变形计算提供方便且可靠的参数基础。

Railway passenger dedicated line is strict on post-construction settlement,while we usually ignore the influence of overburden pressure to the oedometric modulus of soil during settlement calculation. This paper was based on a proposed inter-city railway project between Taiyuan and Jiaozuo. The analysis and comparisons between modification values of standard penetration test data and indoor compression test results on silty clay layer at the Jinzhong plain were completed. The results showed that,oedometric modulus of silty clay and standard penetration number（ revised） was linear positive correlation in the same pressure range,and the fitting goodness of the linear fitting relationship reached more than 0. 924. Through the further analysis of the linear fitting relationship,a relational model among the oedometric modulus,standard penetration number and pressure values on silty clay in this region was established. The applicability of this relational model for the silty clay in this region was verified by an example. Research results could provide a convenient and reliable parameter basis for this region while during settlement calculation about silty clay in this region.