风积沙静动力特性实验研究
Experimental Study on Static and Dynamic Characteristics of Eolian Sand
刘琰君 1尹文华2
作者信息
- 1. 宁夏交投高速公路管理有限公司,银川 750001
- 2. 北方民族大学,银川 750001
- 折叠
摘要
针对我国沙漠公路中风积沙填料经水泥改良后在荷载作用下静动力特性不明确问题,以沙漠公路为依托,进行无侧限抗压试验、三轴剪切试验及动模量与动强度特性试验.研究结果表明,随着水泥掺量的提高,风积沙填料的无侧限抗压强度逐渐增强,而压实度对于抗压强度的影响并不明显.在水泥掺比低于6％时,改良后的风积沙表现出黏聚力和内摩擦角的快速增加,且一旦水泥掺量超过6％,这种增长趋势就开始减缓,随着围压和水泥掺量的增大,风积沙累积塑性应变逐渐减小,临界动应力增加,动模量显著提高.
Abstract
There are problems in the unclear static and dynamic characteristics of the sand deposit filler on the desert highway in China after being improved by cement under load.The study conducts unconfined compressive test,triaxial shear test,dynamic modulus and dynamic strength characteristic test based on desert highway.The results show that,with the increase of cement content,the unconfined compressive strength of eolian sand packing increases gradually,but the effect of compaction degree on compressive strength is not obvious.When the cement ratio is lower than 6％,the cohesive force and internal friction angle of the improved aeolian sand increase rapidly.Once the cement content exceeds 6％,this growth trend begins to slow down.With the increase of confining pressure and cement content,the cumulative plastic strain of aeolian sand gradually decreases,the critical dynamic stress increases,and the dynamic modulus increases significantly.
关键词
风积沙/无侧限抗压实验,三轴剪切实验,动模量与动强度实验Key words
Eolian sand/Unconfined compressive test/Triaxial shear test/Dynamic modulus and dynamic strength test引用本文复制引用
出版年
2024
NETL
NSTL
万方数据