合肥地铁4号线某车站填土厚度分布特征  

Exploration and Distribution Characteristics of Anomaly Area of Artificial Fill in Shitai Road Station of Hefei Metro Line 4

作　　者：李飞飞[1] 牛真茹 Li Feifei;Niu Zhenru(Beijing Urban Construction Exploration&Surveying Design Research Institute Co.,Ltd,Beijing 100101;Tianjin North China Geological Exploration General Institute,Tianjin 300181)

机构地区：[1]北京城建勘测设计研究院有限责任公司,北京100101 [2]天津华北地质勘查总院,天津300181

出　　处：《城市地质》2020年第1期51-55,共5页Urban Geology

摘　　要：填土作为一种人为条件下形成的特殊性土,通常具有不均匀性、欠固结性、高压缩性、工程性质差等特性,不利于工程的安全建设。本文依托合肥地铁4号线某车站岩土工程勘察及车站西端头填土异常区探查成果,对该车站填土物质成分及工程性质进行了研究,沿钻孔剖面线方向对填土厚度空间分布特征进行统计分析。结果表明:场地内填土层连续广泛分布,主要为杂填土,回填材料不均匀、成分复杂、工程性质差异性较大。车站西端头井附近和A号出入口位置填土厚度较大,车站中部填土厚度分布较为均匀,沿钻孔剖面线由西至东填土厚度呈减小的趋势,由南至北填土厚度呈增大的趋势。最后根据场地内填土的工程性质提出相关地基处理建议,研究成果对车站基坑的设计和施工具有一定的指导意义。Artificial filled soil,as a special kind of soil formed under artificial conditions,usually has such the characteristics as non-uniformity,under-consolidation,high compressibility and poor engineering properties,which is not conducive to the safe construction of the project.Based on the geotechnical engineering investigation of the Station of Hefei Metro Line 4 and the exploration results of the anomaly area on the west end of the station,this paper studies the material composition and engineering properties of the station,calculates and analyzes the fill thickness distribution along the direction of Station Section Lines.The results show that:the soil filling in the site is widely distributed continuously,mainly as miscellaneous fill,the backfill materials are uneven,the composition is complex,and the engineering properties are quite different.The thickness of the fill soil near the west end of the station and the entrance and exit A is relatively large.The thickness of the fill in the middle of the station is relatively uniform.The thickness of the fill is decreasing from the west to the east along the cross section of the borehole.From south to north,the thickness of the fill is increasing.Finally,according to the engineering properties of the filling in the site,some suggestions for the treatment of embankment foundation are put forward,the results have certain guiding significance for the design and construction of the pit foundation of the station.

关 键 词：地铁车站 填土 分布特征 厚度异常 探查 

分 类 号：U231.3[交通运输工程—道路与铁道工程]