摘 要
根据《北京地铁奥运支线大屯路公交与地铁换乘站岩土工程勘查报告》，大屯路公交与地铁换乘车站长101.1m ,基坑宽约26m,深约17m，同时参考当地的建筑经验和施工现场的具体情况，完成了大屯路公交与地铁换乘车站深基坑维护的方案论证和设计。降水方案为深井降水，支护方案采用土钉墙、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。得出结论：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,土钉墙,排桩,钢支撑,开挖方式,变形监测,施工组织
类 型: 研究型
ABSTRACT
In the thesis, based on 《The Geotecnical Engineering Investigation Report Of Beijing subway stations and bus transfer station》, the length of station of Beijing subway stations and bus transfer station is 101.1m, the width of foundation pit is about 26m and the depth of foundation pit is approxomately 17m. Simultaneously, refer to the local construction experience and special details of constraction site, that plan testify and design of deep foundation pit retaining of Beijing subway stations and bus transfer station has completed. The plan of retaining adopts soil-nail wall,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; soil-nail; line-pile; steel props; excavation type; deformation; monitoring; construction organization
Type : Research
北京某道路公交与地铁换乘车站深基坑维护设计.pdf
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