摘要
以新建银川—西安高速公路为例,通过现场浸水试验,研究了银西高速公路沿线渭北地区代表性黄土场地浸水后的湿陷变形特征,判定了浸水影响范围,探讨了水分扩散形态.结果表明:该地区为自重湿陷性黄土场地,湿陷等级Ⅳ级;黄土湿陷速率呈现出“慢—快—慢—稳定”的变化特点,整个沉降过程由五段组成,湿陷沉降量在浸水前半期已完成总沉降量的70%;湿陷影响范围垂直向大于水平向;水分扩散形态呈开口逐级扩大的“喇叭型”,扩散角为42°~49°;试坑周围产生近同心圆形连续裂缝,宽度、深度较小;场地黄土湿陷敏感性较强.该研究对渭北地区其它工程具有借鉴意义.
Taking the newly built Yinchuan-Xi’an Expressway Line as an example,through the field immersion test of big thickness collapse loess,the collapsible deformation characteristics of typical loess site along the Yinchuan-Xi’an Expressway Line in Weibei area after immersion were studied,the influence range of immersion was determined,and the water diffusion pattern was discussed.The results show that the loess in this area was self-weight collapsible loess and the grade of collapsibility was levelⅣ.The subsidence rate of loess varied as“slow-fast-slow-stable”.The whole subsidence process was composed of five sections.70%of the total subsidence amount was completed in the first half of the immersion period.The influence range of the subsidence was greater vertically than horizontally.The water diffusion pattern was“trumpet”-type with progressively enlarged opening,and the diffusion angle was 42°~49°.Near concentric circular continuous cracks with small width and depth were found around the test pit,and the site loess was more sensitive to collapsibility.This research has reference significance for other projects in Weibei area.
作者
罗晓锋
尚海丽
郑有伟
李伟华
王艳艳
张宏伟
LUO Xiaofeng;SHANG Haili;ZHENG Youwei;LI Weihua;WANG Yanyan;ZHANG Hongwei(Mining and Coal School, Inner Mongolia University of Science and Technology, Baotou 014010, China;Baotou No.4 Middle School, Baotou 014020, China;Engineering and Training Center, Inner Mongolia University of Science and Technology, Baotou 014010,China;China First Highway Survey and Design Institute, Xi’an 710072, China)
出处
《内蒙古科技大学学报》
CAS
2021年第1期6-12,共7页
Journal of Inner Mongolia University of Science and Technology
基金
内蒙古自然科学基金资助项目(2018MS045).
关键词
渭北地区
湿陷性黄土
现场浸水试验
湿陷特征
Weibei area
collapsible loess
field immersion test
collapsible characteristics
作者简介
通信作者:罗晓锋(1978-),男,内蒙古科技大学讲师,研究方向为湿陷性黄土,e-mail:luoxiaofeng23@qq.com.
