【摘要】 为确定西安地铁车站深基坑的变形特性,收集了18个地铁车站深基坑变形的实测数据,根据实测数据,对深基坑开挖引起的支护结构侧向位移和地表沉降的变形规律进行了统计研究,并将研究结果与其他地区的基坑工程进行比较。结果表明:基坑支护结构侧移曲线形状为"鼓胀形",最大侧移点深度均位于开挖面以上;最大侧移值在0.03%H～0.12%H(H为开挖深度)之间,其值随插入比的增大而减小;地表沉降曲线呈"凹槽形",最大地表沉降位置出现在0.51H处;最大地表沉降约为0.06%H,增大插入比对其值的影响并不显著;最大地表沉降随着最大侧移的增大而增大,且其比值约等于1.10。该研究成果可为西安市类似深基坑工程的变形预测、设计和施工提供参考。更多还原

【Abstract】 In order to determine characteristics of deformation of the deep excavations in Xi’an subway station,the measured data of the deformation of the deep excavations of 18 subway stations were collected.According to the measured data,the characteristics of lateral displacement of the retaining structure and ground surface settlement caused by deep excavations are statistically studied,and the research results are compared with the deep excavations in other areas.The research shows that;The shape of the lateral displacement curve of the deep excavations’ retaining structure is"bulging shape",and the maximum lateral displacement point depth is above the excavation surface;the maximum lateral displacement value ranges from 0.03% H to 0.12%H(H is excavation depth),and decreases with the increase of insertion ratio;the ground surface settlement curve is "groove shape",and the maximum surface settlement position appears at 0.5 1 H;the maximum surface settlement is about 0.06%H,and increase of insertion ratio has no significant effect on the surface settlement;the maximum surface settlement increases with the increase of maximum lateral displacement,and its ratio is approximately equal to 1.10.The research results can provide reference for the deformation prediction,design and construction of similar deep excavations in Xi’an.更多还原