【正文】 n. It plays a role in waterstop, but also enhance the support capability of support piles when the deep mixing cement piles link in the middle of two adjacent soldier piles 200mm which forming a sealed seal waterstop. According to excavation pit depth and importance the level of importance of the designis a secondary. Each segment of the excavation design are strict accordance with the requirements of the relevant norms develop in a safe, economical and reasonable principle. The design made a detailed calculation and explanation about the foundation pit, the main contents include: a description of the project overview , scheme parison and selection of the Foundation Pit Support , determining of Foundation Pit Dewatering Methods, calculation of foundation inflow, the design of Foundation Pit precipitation plan view , design and calculation of waterproof curtain, the design and calculations of Foundation Pit support structure (including the longth calculation of supporting piles, the calculation of maximum bending moment, the calculation tag anchor tension and calculation of the length of tag anchor and the reinforcement calculation For supporting piles), the checking for foundation stability, Foundation Pit construction monitoring. Keyword： Deep Foundation ； Pile anchor Support； stability of Foundation Pit； Waterstop Curtain； foundation pit dewatering III 目 錄 摘要 ............................................................................................................................... I Abstract ......................................................................................................................... II 第 1 章 緒論 .................................................................................................................1 第 2 章 基坑支護(hù)方案設(shè)計(jì) .........................................................................................2 工程概況及設(shè)計(jì)條件 ..........................................................................................2 工程概況 .......................................................................................................2 設(shè)計(jì)條件 .......................................................................................................2 基坑支護(hù)方案的確定 ..........................................................................................4 支護(hù)結(jié)構(gòu)的常見(jiàn)形式 ...................................................................................4 支護(hù)方案的確定 ...........................................................................................6 第 3 章 基坑降水計(jì)算 .................................................................................................8 降水的作用、方法和適用范圍 ..........................................................................8 基坑降水的作用 ...........................................................................................8 基坑降水的方法和適用范圍 .......................................................................8 基坑涌水量計(jì)算 ..................................................................................................9 單井出水量計(jì)算 ................................................................................................11 管井?dāng)?shù)量計(jì)算 ....................................................................................................12 管井的平面布置 ................................................................................................12 井管長(zhǎng)度計(jì)算 ....................................................................................................13 第 4 章 止水帷幕設(shè)計(jì) ...............................................................................................15 止水帷幕的設(shè)置原則 ........................................................................................15 止水帷幕的做法 ................................................................................................15 止水帷幕的一般做法及適用條件 .............................................................15 止水帷幕施工方法的確定 .........................................................................15 止水帷幕樁長(zhǎng)的計(jì)算 ........................................................................................16 第 5 章 基坑支護(hù)結(jié)構(gòu)設(shè)計(jì) .......................................................................................17 基坑北側(cè)支護(hù)結(jié)構(gòu)設(shè)計(jì) ....................................................................................17 土層信息 .....................................................................................................17 土壓力系數(shù)計(jì)算 .........................................................................................17 道路 荷載對(duì)基坑北側(cè)土層的附加應(yīng)力 .....................................................18 IV 主動(dòng)土壓力強(qiáng)度計(jì)算 .................................................................................18 坑底被動(dòng)土壓力強(qiáng)度計(jì)算 .........................................................................20 考慮道路荷載影響的 主動(dòng)土壓力強(qiáng)度計(jì)算 .............................................21 坑底以下凈土壓力強(qiáng)度計(jì)算 .....................................................................22 支護(hù)樁的嵌入深度、水平支錨力和最大彎矩的計(jì)算 .............................22 錨桿長(zhǎng)度計(jì)算 .............................................................................................26 圍護(hù)樁的配筋計(jì)算 ...................................................................................28 基坑穩(wěn)定性驗(yàn)算 .......................................................................................29 基坑南側(cè)支護(hù)結(jié)構(gòu)設(shè)計(jì) ....................................................................................38 土層信息 .....................................................................................................38 土壓力系數(shù)計(jì)算 .........................................................................................38 已有建筑物荷載對(duì)基坑南側(cè)樁后土體的附加應(yīng)力 .................................39 主動(dòng)土壓力強(qiáng)度計(jì)算 .................................................................................39 坑底被動(dòng)土壓力強(qiáng)度計(jì)算 .........................................................................41 考慮建筑物荷載影響的主動(dòng)土壓力強(qiáng)度計(jì)算 ..............