摘要
泥岩等半成岩地层在我国分布广泛,其遇水崩解,强度也随之急剧弱化,易导致基坑的大变形及坍塌。以南宁市半成岩地区城市轨道交通基坑建设为背景,对该市20个城市轨道交通车站深基坑的围护结构变形特性进行统计分析,探讨了深基坑围护结构变形随设计参数及地层分布的变化规律。进一步以南宁市轨道交通3号线青秀山站超深基坑(最大开挖深度为58.7 m)为案例,综合工程实测与三维数值模拟,分析了半成岩地区超深基坑围护结构的变形特性。
Semi-diagenetic rock layer with such as mudstone are widely distributed in China.When encountering water,semi-diagenetic rock deconstructs,and its strength drastically weakens,which will easily lead to large deformation and collapse accidents of foundation pit.Taking the construction of urban rail transit pit in semi-diagenetic rock area of Nanning as background,statistical analysis of enclosure structure deformation characteristics of 20 urban rail transit deep foundation pits is carried out.The variation law of deep foundation pit enclosure structure deformation according to design parameters and stratum distribution is discussed.In addition,taking Qingxius-han station foundation pit of Nanning Rail Transit Line 3(maximum excavation depth of 58.7 m)as study case,by comprehensively carrying out engineering measurement and three-dimensional numerical simulation,the deformation characteristics of ultra-deep foundation pit enclosure structure in semi-diagenetic rock area is analyzed.
作者
邹成路
林威
罗文静
周彪
谢雄耀
ZOU Chenglu;LIN Wei;LUO Wenjing;ZHOU Biao;XIE Xiongyao(Guangzhou Metro Design&Research Institute Co.,Ltd.,510010,Guangzhou,China)
出处
《城市轨道交通研究》
北大核心
2022年第3期150-155,共6页
Urban Mass Transit
基金
国家自然基金重点项目(52038008)
上海市科委重大专项(2017SHZDZX02)。
关键词
城市轨道交通车站
深基坑
超深基坑
半成岩
围护结构
变形特性
urban rail transit station
deep foundation pit
ultra-deep foundation pit
semi-diagenetic rock
enclosure structure
deformation characteristics
