中砂类B组路基土静力特性试验分析

Experimental analysis on static characteristics of medium sand class B group subgrade soil

为了研究中砂类B组路基土的静力特性,在了解其物理特性的基础上,采用中砂及粉质黏土配置了4种不同细粒含量的中砂类B组土,根据常规三轴压缩试验研究了围压和细粒含量对试验土体应力-应变关系及静强度的影响.结果表明,在相同细粒含量条件下,随着围压的增大,试样的应力-应变曲线上升显著,在同一应变值时,应力相差较大,且150 k Pa的曲线应力差值最为明显;在相同围压条件下,细粒含量对应力-应变曲线的影响不明显,细粒含量低于30%时,应力-应变曲线走势几乎一致,应变增大的同时应力提高.

In order to explore the static characteristics of medium sand class B group subgrade soil,four kinds of medium sand class B group soil with different fine particle contents were prepared with the medium sand and silty clay based on understanding the physical properties of subgrade soil. The influence of confining pressure and fine particle content on the stress-strain relationship and static strength of the testing soil was studied with the conventional triaxial compression test. The results show that at the same fine particle content,the stress-strain curve of the sample significantly increases with increasing the confining pressure. At the same strain value,the stress difference is large,and the stress difference on the 150 k Pa curve is the most obvious. At the same confining pressure,the fine particle content has no obvious influence on the stress-strain curve. When the fine particle content is less than 30%,the trend of stress-strain curve is almost unanimously,and the stress increases with increasing the strain.