摘要
采用掺拌1∶1砂砾对西宁南绕城高速公路中硫酸盐渍土进行改良,分析了砂砾改良前后盐渍土的微观结构,并分别采用振动压实和重型击实对改良弱盐渍土的压实效果进行分析。结果表明:砂砾能有效改善盐渍土的级配,增加颗粒间的摩阻力,使土的抗剪强度得到较大提高,同时增强土体的结构性;弱盐渍土采用振动法压实获得的干密度大于用重型击实获得的干密度,压实效果更好,工程中宜用振动压实法确定盐渍土的室内最大干密度。
The paper, analyzing and arranging the data of the field test of Herringbone flexible pile structure by slice method of pile section, is to study on the change of bending moment and axial force of the structure under horizontal load, stress distribution in pile section and load sharing characteristics of pile body material. The results show that there is obvious regularity of whole structure loading on the bending moment distribution of the flexible pile structure. The distribution change of pile shaft axial force, which is influenced by surrounding rock and soil medium, is rather complicated. Axial force of pile shaft is generally higher than the pile bending moment value of an order of magnitude, which shows that the Herringbone flexible pile structure can give full play to the performance of pile body material. The internal force of the flexible pile section is mainly provided by steel bar, which means that improving the ratio of reinforcement can obviously increase the internal force of the flexible pile section.
出处
《路基工程》
2017年第4期97-100,共4页
Subgrade Engineering
关键词
盐渍土
砂砾改良
压实特性
振动压实
重型击实
微观结构
herringbone flexible pile
field test
slice method of pile section
internal force distribution characteristics
