摘 要
根据《XLL站岩土工程详细勘察报告》，确定XLL地铁换乘车站长299.09m ,基坑宽约12m,深约14.3m，同时参考当地的建筑经验和施工现场的具体情况，完成了XLL地铁换乘车站深基坑围护的方案论证和设计。
降水方案为深井降水，支护方案采用排桩、内支撑联合支护。基坑开挖方式为分步、分段、分层开挖。在开挖的同时对基坑进行监测，监测的内容包括桩体变形、桩身内力、支撑轴力，并得出以下结论：桩顶水平位移反映支护结构的顶部变形情况，是支护结构安全状况的重要指标，且在有支撑作用的情况下支护变形最大。最后,根据施工方案对工程进行了施工组织设计。
关键词: 深基坑 支护方案 排桩 钢支撑 施工组织
Abstract
In the thesis, based onThe Geotecnical Engineering Investigation Report Of XLL subway station》, the length of station of XLL subway stations station is 299.09m, the width of foundation pit is about 12m and the depth of foundation pit is approxomately 14.3m. Simultaneously, refer to the local construction experience and special details of constraction site, the plan testify and design of deep foundation pit retaining of XLL subway stations has been completed.
The plan of retaining adopts line-pile,steel props to retain together. The type of excavation adopts a way for the minute step,the partition,the lamination excavates. While excavating foundation pit, foundation pit monitoring is carrying on, including pile deformation, pile interal force, inner axial force. The study shows the deformation characteristics of supporting structure is related to the horizontal displacement of the retaining pile top, which is the important criterion of the safety of condition of supporting structure. With the effect of supporting structure, the deformation is the largest . Finally, according to construction scheme, the construction organization design has been finished.
Key Words: deep foundation pit; retaining plan; line-pile; steel props;
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