干湿循环下红砂岩路基填料压缩特性试验研究  

Study on the compression property of red sandstone roadbed under the action of dry-wet cycles

作　　者：胡甜[1,2] 赵健[2] 洪雄杰[2] 郭巍[2] 

机构地区：[1]中交第二公路勘察设计研究院有限公司,武汉430056 [2]长沙理工大学交通运输工程学院,长沙410076

出　　处：《工程勘察》2013年第8期15-19,共5页Geotechnical Investigation & Surveying

基　　金：湖南省自然科学基金资助项目(10JJ6070);交通运输部重大科技专项(2011318824350)

摘　　要：为深入研究干湿循环影响下红砂岩路基的沉降变形规律,利用自行研制的大型室内土体侧限压缩试验装置对红砂岩土石混合填料进行了反复浸水干、烘干的湿循环条件下的大型一维侧限压缩试验。试验结果表明:干湿循环环境对红砂岩土石混合料的压缩变形有明显影响,反复浸水干湿循环后,红砂岩土石混合料的单位沉降量和压缩系数均呈逐渐增大趋势,且第二次干湿循环之前增长幅度较大,之后逐渐变缓;孔隙比也逐渐增大;前两次浸水干湿循环后压缩模量下降幅度较大,之后逐渐趋于稳定。红砂岩土石混合料反复浸水干湿循环后压缩性能有大幅度衰减,浸水红砂岩土石混填高路堤沉降计算时考虑干湿循环条件的影响更符合实际工况。In order to research the settlement deformation rules of the red sandstone roadbed in the dry-wet cycles environment, one-dimensional large scale confined compression tests were performed on the mixture of sandstone soil and rock using the self-developed test device under the condition of the dry-wet cycles by repeated immersion. The results show that dry-wet cycle effects the compression deformation of the red sandstone mixture obviously. Both of the unit settlement and compression coefficient of red sandstone tend to increase after several dry-wet cycles, and they increase greatly after first dry-wet cycle and then become gentle; the void ratio increase gradually; the compression modulus decrease rapidly in the first two cycles and then were steady gradually. The compressive property of sandstone soil and rock mixture decrease greatly after several dry-wet cycles. It is much more conform to the actual working conditions in the settlement calculation of red sandstone roadbed considering of seasonal alternate dry-wet effect.

关 键 词：干湿循环 红砂岩 压缩变形 路基 

分 类 号：TU458[建筑科学—岩土工程]