干湿循环条件下镇江下蜀土的变形特性研究  

Study on Deformation Characteristics of Xiashu loess in Zhenjiang under Dry-wet Cycles

作　　者：王威[1] 刘顺青[2] 杨正玉[1] 吴礼浩 WANG Wei;LIU Shunqing;YANG Zhengyu;WU Lihao(The 3rd Geological Brigade of Jiangsu Geology&Mineral Resources Bureau,Zhenjiang 212001,China;School of Architecture and Civil Engineering,Jiangsu University of Science and Technology,Zhenjiang 212100,China)

机构地区：[1]江苏省地质矿产局第三地质大队,江苏镇江212001 [2]江苏科技大学土木工程与建筑学院,江苏镇江212100

出　　处：《华南地震》2021年第2期99-104,共6页South China Journal of Seismology

基　　金：国家自然科学基金项目(51579119);江苏省地质矿产勘查局科研项目(2019KY03)联合资助。

摘　　要：镇江地区的下蜀土常作为路基填料,然而在干湿循环作用下其变形特性如何还缺少系统研究。以镇江南徐大道附近的下蜀土为试样,开展不同干湿循环次数下的固结压缩试验,研究下蜀土的变形特性与干湿循环次数的变化规律,并以此为基础,分析干湿循环对下蜀土路基沉降的影响。研究结果表明:随着干湿循环次数的增加,镇江下蜀土的压缩系数逐渐增大,经历5次干湿循环后,下蜀土的压缩系数趋于稳定;干湿循环对下蜀土路基沉降的影响较大,随着干湿循环次数的增加,下蜀土路基变形的影响区域从较深层逐渐向干湿循环影响层过渡。Xiashu loess in Zhenjiang area is often used as subgrade filling material.However,there is no systematic study on its deformation characteristics under the action of wet-dry cycles.In this paper,Xiashu loess near Nanxu road in Zhenjiang is taken as the samples to carry out the consolidation compression test under different dry-wet cycles.The deformation characteristics of Xiashu loess are studied under different dry-wet cycles.And then the influence of dry-wet cycles on Xiashu loess subgrade settlement is analyzed.The results show that the compression coefficient of Xiashu loess increases with the increase of wet-dry cycles,and tends to be stable after five cycles.The dry-wet cycle has great influence on the settlement of Xiashu loess subgrade With the increase of the number of dry-wet cycles,the influence area of Xiashu loess subgrade deformation gradually transits from deeper layer to dry-wet cycle influence layer.

关 键 词：干湿循环 下蜀土 路基 沉降 压缩系数 

分 类 号：TU411.7[建筑科学—岩土工程]