摘要
以洛阳市地铁1号线卵石深基坑为工程原型,采用颗粒离散元软件PFC^(2D),建立级配不良卵石层深基坑支护结构数值分析模型,分析地表沉降和支护结构变形规律。研究结果表明:围护结构插入比对地表沉降的影响存在3个发展阶段,适用于级配不良中密卵石基坑的插入比范围为0.38～0.58。根据对变形规律的分析,得到内撑在控制围护结构侧向位移和地表变形中作用效果不同的结论。通过理论与实测数据对比,论证级配不良中密卵石地层基坑内支撑设计和插入比选择的可靠性。研究成果可为类似卵石地层中地铁深基坑施工提供参考。
The particle discrete element software PFC^2D is used to establish the numerical analysis model of the deep foundation pit supporting structure in bad gradation pebble stratum to study the surface subsidence and the deformation rules of support structure based on the deep foundation pit construction in Luoyang Metro Line 1.The results show that,there are three developing stages in the influence of the insertion ratio of the retaining structure on the surface subsidence.And the insertion ratio for middle-dense pebble foundation pit with poor gradation is 0.38~0.58.By analysis of the law of deformation,the conclusion of the different effects of internal braces on lateral displacement and surface deformation of retaining structures is obtained.Finally,by comparison of the theoretical and measured data,the reliability of internal support design and insertion ratio selection in mediate-dense pebble foundation pit with bad gradation is demonstrated.The research results provide a certain reference value for the construction of deep foundation pit in the similar pebble stratum.
作者
王明年
曾正强
赵银亭
刘大刚
吴圣智
WANG Mingnian;ZENG Zhengqiang;ZHAO Yinting;LIU Dagang;WU Shengzhi(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;Key Laboratory of Transportation Tunnel Engineering,Ministry of Education,Southwest Jiaotong University,Chengdu 610031,China)
出处
《铁道科学与工程学报》
CAS
CSCD
北大核心
2019年第3期646-653,共8页
Journal of Railway Science and Engineering
基金
国家自然科学基金资助项目(51578458)
关键词
卵石基坑
变形规律
插入比
支护时机
级配不良
pebble foundation pit
deformation rules
insertion ratio
supporting time
bad gradation
