基坑维护工程设计与施工.docVIP

本科毕业设计说明书 合肥枫林大厦基坑维护工程设计与施工 THE DESIGN AND CONSTRUCTION OF HEFEI FENGLIN BUILDING PIT MAINTENANCE ENGINEERING 学院（部）：土木建筑学院 专业班级： 土木08-4班 学生姓名： 指导教师： 2012年6月 摘要 基坑工程是指在地表以下开挖的一个地下空间及其配套的支护体系。而基坑支护就是为保证基坑开挖，基础施工的顺利进行及基坑周边环境的安全，对基坑侧壁以及周边环境采用的支挡，加固与保护措施。 本设计主要是对合肥枫林大厦基坑维护工程进行设计，本设计是根据国家现行建筑基坑支护技术规程,在给定地质勘察报告的条件下，进行基坑支护设计，主要目的是掌握基坑支护的设计方法。该基坑开挖深度9.8米，基坑长为80米，宽70米，根据地质条件及周边环境，综合各种条件，决定采用钻孔灌注桩支护，采取水泥搅拌桩施工措施以解决挡水问题。在进行支护桩设计计算时，土压力计算采用朗肯土压力理论进行水土合算，钻孔灌注桩按纯弯构件设计，桩外深层搅拌桩按抗管涌要求计算桩长，并对基坑进行稳定性验算，基坑降水采用井点降水方法。 本设计还详细介绍了钻孔灌注桩、深层搅拌桩以及内支撑等方面的施工工艺，同时也详细介绍了工程监测方面的内容。 关键词：基坑支护，灌注桩，土压力，工程监测 ABSTRACT Foundation pit engineering is defined below the surface excavation of an underground space and its supporting system. The foundation pit is to ensure the excavation, foundation construction is carried out smoothly and pit safety of the surrounding environment, on the pit side wall and the surrounding environment of retaining, strengthening and protection measures. Based on the current national building foundation pit shoring technology regulations and the given geological conditions, this design is mainly to Hefei Fenglin building foundation pit maintenance project. The main purpose of the design is to master the method of foundation pit support design. The excavation of foundation pit depth is 9.8meters, 80 meters long, 70 meters wide. According to the geological conditions and the surrounding environment, integrated all sorts of conditions, this design adopts the bored pile, cement mixing pile construction measures taken to solve the water problem. The retaining pile design and calculate as following, the calculation of earth pressure using Rankines earth pressure theory, bored pile by pure bending component design, cement mixing pile length resisting piping, and the checking computations of the stability of foundation pit, foundation pit dewatering by well point precipitati