元坝净化厂1号烟囱深基坑支护设计要点详解.doc

元坝净化厂1号烟囱 深基坑支护设计 作者姓名： # 专业名称：土木工程 指导教师： 摘要 元坝净化厂钢筋混凝土烟囱是土建工程中最高的构筑物，高120米，直径为，整个现场共有4座，每座烟囱的主要工程量有钢筋工程150吨、商品混凝土810立方米，基坑开挖深度都在10m左右，属于深基坑。1号烟囱基坑处地层主要有杂填土粘土淤泥质粉质粘土,粉土夹粉砂粉砂粉细砂，基坑支护采用钻孔灌注工艺的支护桩进行支护，同时在基坑上部减载放坡，坑壁设置粉喷桩止水帷幕。 在进行支护桩设计计算时，土压力计算采用郎肯土压力理论，支护桩桩长为13.5m，求取支护桩的最大弯矩后求支护桩的配筋。在通过配筋验算后还要对此段基坑的稳定性进行验算，采用里正软件分析基坑的整体稳定性,基坑底的隆起和基坑的管涌，通过验算可知1号烟囱基坑支护设计满足基坑的稳定性要求。 关键词： 深基坑 支护设计 稳定性 Abstract Reinforced concrete chimney purification plant yuan dam is the highest of civil engineering structures, the height of 120 meters, meters in diameter, a total of four throughout the site, each chimney major quantities are 150 tons, 810 cubic meters of commercial concrete reinforcement engineering, foundation pit excavation depth around 10 m, belong to the deep foundation pit.1 the chimney foundation pit formation mainly include miscellaneous fill, clay, silt silty clay, silt powder sand, silt, silty sand, foundation pit supporting of holing technology on bolting supporting pile, at the same time reducing load on the upper foundation pit slope, pit water stop curtain wall set powder spray pile . When supporting pile design calculation, earth pressure calculated with Rankines earth pressure theory, the supporting pile length is 13.5 m, after calculating the maximum bending moment of supporting pile for reinforcement of retaining piles.After through reinforcement calculation but also for checking of this section of the stability of foundation pit, is the software used to analyze the global stability of the foundation pit, uplift to the bottom of foundation pit and foundation pit piping, by calculating the no. 1 whether chimney foundation pit supporting design meet the requirements of the stability of foundation pit. Keywords: deep foundation pit, supporting design, stability 目录 摘要 I Abstract III 目录 V 前言 1 1 绪论 2 1.1 深基坑工程的主要内容 2 1.2 深基坑支护的类型 3 1.3 存在的常见问题 3 1.4 深基坑技术的发展趋势 6 2 工程概况及工程地质条件 8 2.1 工程概况 8 2.2 工程地质与水文地质条件 8 2.2.1 场区地层概况及工程性质 8 2.2.2 场区区域地质构造 10 2.2.3 场区地形地貌 11 2.2.