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a99 基坑 支护 毕业设计 课程设计

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A99+基坑支护毕业设计课程设计,a99,基坑,支护,毕业设计,课程设计

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基坑工程设计摘 要拟建工程，地面以上6层，地下2层。总建筑面积69533m2，其中地上建筑面积为54330 m2，地下建筑面积为15203m2，建筑0.00相当于绝对标高17.25m，基坑开挖深度8.50m。结合本工程地质、环境、挖深等诸多因素确定安全可靠的支护方案；为基坑土方开挖和地下室施工创造一个安全干燥的施工环境；考虑到邻近坑边有建筑和道路（下设有水、电、气等管线），为确保安全，以“变形”控制设计。本着“安全可靠、经济合理、技术可行、施工方便”原则，整个基坑采用一排钻孔灌注桩作挡土结构, 一道钢筋混凝土支撑作为支撑结构体系。基坑西侧和北侧坳沟、暗塘处采用深层搅拌桩作止水帷幕。基坑内采用集水坑排水。关键词：深基坑 支护结构 挡土结构 钢筋混凝土支撑 钻孔灌注桩 The design for foundation pit of national microstructure laboratory in Nanjing UniversityAbstract The building of national microstructure laboratory in Nanjing University to be proposally constructed is 6-layer tall, including 2 basements. Its general construction area is 69533 square meters, containing 54330 square meters above the ground surface and 15203 square meters below the ground surface. The average level of the construction for 0.00, absolute level is 17.25 meters. The depth of excavation is 8.5 meters.Considering of the geologic environment, excavation depth of the foundation pit, to create an safe and dry surroundings for the earth work and basement, we carry out the design in control of displacement deformation, in order to keep the main traffic roads and buildings safe and to arrange pipelines of water, electricity and coal gas below the surface. According with fundamental technical standard, approaching safe reliability, the economical-reasonable and convenient construction and guaranteeing project time limit，we use nondisplacement piles as retaining structure, reinforced concrete bracing as bracing structure.In the western and northern parts of the foundation pit, we use deep churning piles as detaining water pile construct enclosed cut off trench. With the purpose of dewatering, we use sump.Key words: Foundation pit; Bracing structure; Retaining structure; Reinforced concrete bracing; Nondisplacement pile目 录第一章 设计方案综合说明1.1 概述11.1.1工程概况11.1.2基坑周边环境条件11.1.3工程水文地质条件11.1.4基坑侧壁安全等级及重要性系数21.2 设计总说明21.2.1设计依据21.2.2支护结构方案21.3 基坑监测3第二章 基坑支护结构设计计算书2.1 设计计算42.1.1地质计算参数42.1.2计算区段划分42.1.3计算方法42.1.4土压力系数计算42.2 ABC段支护结构设计计算52.2.1土层分布52.2.2土层侧向土压力计算52.2.3土压力合力及作用点的计算72.2.4支撑轴力计算72.2.5桩长计算72.2.6最大弯矩计算82.2.7拆撑计算82.2.8配筋计算82.3 CDEF段支护结构设计计算92.3.1土层分布92.3.2土层侧向土压力计算92.3.3土压力合力及作用点的计算102.3.4支撑轴力计算112.3.5桩长计算112.3.6最大弯矩计算112.3.7拆撑计算122.3.8配筋计算122.4 FGHA段支护结构设计计算122.4.1土层分布122.4.2土层侧向土压力计算122.4.3土压力合力及作用点的计算142.4.4支撑轴力计算142.4.5桩长计算152.4.6最大弯矩计算152.4.7拆撑计算152.4.8配筋计算162.5 支撑结构设计计算162.5.1支撑轴力162.5.2支撑弯矩计算162.5.3初始偏心距172.5.4是否考虑偏心矩增大系数172.5.5配筋计算172.5.6整体稳定性验算172.5.7联系梁172.6 圈梁设计计算182.6.1 ABC段圈梁设计计算182.6.2 CDEF段圈梁设计计算182.6.3 FGHA段圈梁设计计算182.6.4是否考虑偏心矩增大系数192.7 立柱强度计算19 2.7.1上段钢立柱32510钢管19 2.7.2下段钢筋砼立柱强度验算202.8 基坑止降水设计20 2.8.1止水桩长确定20 2.8.2基坑止水帷