济南长清区湿陷性黄土物理力学性质及地基处理方法研究

Physical and Mechanical Properties and Ground Treatment of Collapsible Loess in Changqing District of Jinan

济南黄土系风成-冲积、洪积成因的黄土状土,上部为全新世(Q4)堆积,下部主要为马兰期(Q3)堆积,济南长清区湿陷性黄土厚度一般为3～6m,主要为非自重湿陷性黄土,湿陷性轻微～中等,湿陷系数通常随深度逐渐减小,其标准贯入锤击数N与土层压缩模量Es0.1～0.2的经验关系为Es0.1～0.2=0.9669N,相关系数r=0.7875,二者相关性较好。该地区的地基处理方法常采用灰土垫层法和强夯法。

The loess in Jinan is a product of aeolian alluvial and proluvial process, the upper part of loess was piled up during Holocene （ Q4）, the lower part was piled up during Malan period （ Q3 ）. The thick- ness of collapsible loess in Changqing district of Jinan is usually 3 - 6m, and it is mainly non-collapsible loess under overburden pressure, its collapsibillity is slightly to medium, its coefficient of collapsibility gradually decreases with depth increasing. The empirical relationship of the blow count of standard pene- tration test and the compression modulus is Es0.1-0.2 = 0.9669N, the correlation coefficient is r = 0. 7875. The treatment method of collapsible loess in the area is used by lime soil cushion and dynamic compaction method.