摘要
以苏州沧浪新城地铁站深基坑为研究对象,对该站复杂的周边环境进行了详细介绍,重点分析南北两侧土体非对称扰动产生的原因及对围护结构的影响。结果表明:不同直径的咬合桩、不同厚度的地连墙与围护结构侧向位移之间均呈现近似线性关系。弱扰动区土体的沉降总体呈现较为有规律的沉降槽,而强扰动区土体沉降无明显规律。建筑物沉降随着与基坑距离的增大而逐步减小:弱扰动区建筑物沉降总体较为均匀,而强扰动区建筑物差异沉降明显。土体扰动程度对围护结构深层水平位移的影响有限,最大不超过8.0%。立柱隆起均存在峰值,最终隆起量与峰值隆起量之比为0.62~0.94。下部支撑拆除过快会导致上部支撑内力的迅速增大。
Based on Suzhou Canglang Subway Station excavation,the complex peripheral circumstance was described in detail.The reason of soil asymmetrical disturbance between two sides and the influence on retaining structures were emphatically analysis.Approximate linear relationship was observed between horizontal displacements of retaining structures and bored interlocking piles with different diameters or diaphragm retaining walls with different thickness.The soil settlement in weak disturbance area presented settling tank with laws,while strong disturbance area showed no evident regularity.The settlement gradually decrease with increasing distance between buildings and retaining structures:it showed uniform settlement to buildings in weak disturbance area,while differential settlement observed obviously in strong disturbance area.limited effects to deep horizontal displacement of retaining structures with the disturbance degree of soil,no more than 8%.A peak value observed in the uplift of columns,the ratio value between terminal and peak is 0.62~0.94.The internal force of upper support increased rapidly if lower support demolished too fast.
作者
袁运涛
李苏春
韩霜
鲁瑞武
YUAN Yuntao;LI Suchun;HAN Shuang;LU Ruiwu(Jiangsu Huayan Construction Co.,Ltd.,Suzhou,Jiangsu 215001,China;Jiangsu Huadu Construction Co.,Ltd.,Nanjing,Jiangsu 210008,China)
出处
《施工技术》
CAS
2019年第S01期663-667,共5页
Construction Technology
关键词
地铁车站
深基坑
土体扰动
优化设计
监测
subway stations
deep foundation excavation
soil disturbance
optimal design
monitoring
