【正文】 cture and convenient content of this paper is the design of structure and construction of confferdam. The structural dimension of confferdam is decided according to the cap size (10m 10m? )and the depth of water(8m ).The stress of ponent of cofferdam including edge foot , wainscot, vertical stiffening rib,partment ,horizontal truss are analyzed and checked up under the action of different construction behaviour loads. The dimension must be study out again if the stress is cheked up to be finite element analysis software MIDAS is used to model the confferdam for holistic putation,then the result is pared with the result of manual calculations for contrastive the construction scheme of stepped subsiding is determined in reason. Key words: deep water foundations doublewall steel confferdam finite element analysis construction scheme 目 錄 第 1 章 緒論 ....................................................................................................................... 1 國內(nèi)外現(xiàn)狀 ............................................................................................................... 1 工程背景 ................................................................................................................... 4 鋼圍堰施工工藝簡介 ............................................................................................... 5 雙壁鋼圍堰受力分析 ............................................................................................... 8 第 2 章 圍堰結(jié)構(gòu)設(shè)計(jì) —— 結(jié)構(gòu)力學(xué)方法 ....................................................................... 9 圍堰構(gòu)造 ................................................................................................................... 9 設(shè)計(jì)荷載 ................................................................................................................. 10 荷載種類 .......................................................................................................... 10 流水壓力 .................................................................................................... 10 靜水壓力 .................................................................................................... 10 波浪力 ........................................................................................................ 11 土壓力 ........................................................................................................ 11 計(jì)算工況 .......................................................................................................... 12 結(jié)構(gòu)設(shè)計(jì) ................................................................................................................. 12 荷載組合 .......................................................................................................... 12 圍堰總體尺寸擬定 .......................................................................................... 12 工況 1 設(shè)計(jì) ...................................................................................................... 13 隔艙板尺寸 ................................................................................................ 13 土壓力計(jì)算 ................................................................................................ 14 每個(gè)隔艙板的抗彎能力計(jì)算 .................................................................... 15 豎向隔艙鋼板工字型組合梁加勁肋布置 ................................................ 15 工況 2 設(shè)計(jì) ...................................................................................................... 15 荷載計(jì)算 .................................................................................................... 15 隔艙板受力檢算 ........................................................................................ 16 內(nèi)支撐受力檢算 ........................................................................................ 17 水平環(huán)板受力檢算 .................................................................................... 18 水平桁架的斜桿受力計(jì)算 ........................................................................ 20 加勁肋受力驗(yàn)算 ........................................................................................ 21 面板折算應(yīng)力驗(yàn)算 .................................................................................... 22 檢算懸臂根部應(yīng)力 .................................................................................... 22 檢算承臺(tái)澆筑完成后可否拆除內(nèi)支撐 .................................................... 24 圍堰整體抗浮驗(yàn)算 ................................................................................................. 25 圍堰下沉系數(shù)計(jì)算 .......................................................................................... 25 計(jì)算圍堰自重 ............................................................................................ 25 計(jì)算鋼圍堰所受浮力 ................................................................................ 26 計(jì)算圍堰與土體摩阻力 ............................................................................ 27