摘要
依托成都轨道交通17号线威灵车站深基坑工程,针对成都地区膨胀土地层地铁深基坑施工过程中常出现围护桩间土坍塌破坏问题,采用室内试验的方法,对基坑内膨胀土进行物理力学特性研究。结果表明:该地区膨胀土微观结构呈鳞片状排列,矿物成分主要含有蒙脱石和伊利石;宏观上无荷载膨胀率、膨胀力及抗剪强度均随土体含水率增加而降低,随着干湿循环次数增多,土体结构完整性逐渐被破坏,裂隙最终呈网格状分布。
Based on the deep foundation pit project of Weiling Station of Chengdu Rail Transit Line 17,aimming at Collapse of soil between maintenance piles often occurs during the construction of subway deep foundation pit in expansive soil layer in Chengdu area,the physical and mechanical characteristics of expansive soil in the foundation pit are studied by means of indoor test.The results show that the microstructure of expansive soil in this area is arranged in a scale shape,and the mineral composition mainly contains montmorillonite and illite.Macroscopically,the non-load expansion rate,expansion force and shear strength all decrease with the increase of soil moisture content.With the increase of drying and wetting cycles,the structural integrity of soil is gradually destroyed,and the fissures eventually distribute in a grid shape.
作者
李江峰
陈龙
李红学
程敏杰
LI Jiangfeng;CHEN Long;LI Hongxue;CHENG Minjie(The 4th Engineering Co.,Ltd.of China Railway 12th Bureau Group,Xi'an 710024,China;State Key Laboratory of Geohazard Prevention and Geoenvironment Protection(Chengdu University of Technology),Chengdu 610059,China)
出处
《路基工程》
2023年第4期44-49,共6页
Subgrade Engineering
基金
中铁十二局集团有限公司科技计划项目(公司2020研-10)。
关键词
成都地区
膨胀土
微宏观特性
膨胀特性
裂隙规律
Chengdu area
expansive soil
micro and macro characteristics
expansion characteristics
fissures law
作者简介
李江峰(1983-),男,四川成都人。高级工程师,主要从事隧道施工技术与管理工作。E-mail:495297947@qq.com。