南山路五标民大隧道边坡基坑计算书_毕业论文.doc

毕业设计说明书（毕业论文） 兰州市南山路五标民大隧道（东段）结构设计 专 业：岩土与地下工程 学 生：xxx 指导教师：xxx  摘要 拟建兰州市南山路五标民大隧道（东段），位于兰州市城关区五泉山下，处于南山路东段。，民大隧道结构，采用现浇矩形闭合框架混凝土结构。隧道断面形式采用双洞，洞宽14m，高5m，上覆土层2m，重度为。隧道所处位置地形复杂、地面建筑物多。隧道基坑开挖深度17米，由于场地限制，需在基坑开挖前进行基坑支护。 通过对拟建场地的工程地质条件分析，基坑边坡为两级支护，分别为6.0m，11.0m.在本次基坑支护设计过程中，考虑到施工经济等原因，根据场地的土层条件及兰州市类似基坑工程的经验，为保证基坑的稳定性及尽量节省投资，先后分析了三种方案：1. 土钉墙支护；2.桩-锚支护；3悬臂梁支护.基坑支护结构设计的安全等级按一级考虑，重要性系数取γ0=1.1。 关键词：土钉墙 多支点排桩 基坑支护 矩形闭合框架 Abstract Proposed composite commercial residential buildings in Handan City, Rochester head Handan urban south, the west side of the street bright light drinks factory, 29 of the ground, underground floor, building height 87.0 m, the form of a shear wall of the structure, the foundation design class Category B are. Pit depth of 10 m.  Through the proposed venue of the engineering geological conditions, the shallow groundwater level by retaining measures. As little depth of excavation, it may try to consider adopting a simpler foundation pit support measures to ensure that the basis for normal construction and the safety of the main underground structures and surrounding buildings will not be harmed.  In the pit supporting the design process, taking into account the construction of economic and other reasons, according to the site and soil conditions similar excavation works in Handan City of experience, to ensure the stability of the pit and save as much as possible investment, the pit wall To a ranking of the different levels of pit wall to a different support programmes. Has analyzed two options: 1. Cantilever pile support, 2. Cantilever pile and bolting 3. Soil nail wall support. As deep pit, piles cantilever calculated deformation and displacement of very large economic and reinforced, so be excluded. Cantilever pile and the anchor of the programme, additional single-soil drainage from the retaining wall of the role. In addition to the north pit wall for the two grades, the rest were level, usin