深基坑畢業(yè)設(shè)計(jì)-廣場a-ij段基坑支護(hù)設(shè)計(jì)(文件)
【正文】 25MPa 的普通硅酸鹽水泥粒徑不大于 25mm的中細(xì)砂和粒徑小于 5mm的瓜米石鋼筋網(wǎng)規(guī)格為Φ 65＠ 200 200 加強(qiáng)筋為Φ 16 圓鋼將各排錨桿加強(qiáng)筋焊成網(wǎng)絡(luò) 以增加面層剛度上下段鋼筋網(wǎng)搭接長度應(yīng)大于 300mm 錨桿長度為 30m45m 間距 1200mm 1200mm 角度 15 度當(dāng)土層松散孔內(nèi)塌孔嚴(yán)重時(shí)用一次性錨管代替錨桿錨管規(guī)格為Φ 48 28 錨管需采用幫焊角鋼的方法加強(qiáng)處理 第三節(jié) 坑壁粉噴樁設(shè)計(jì) AIJ 段 基坑坑壁采用攪拌樁工藝攪拌樁采用干噴工藝樁徑為 500mm 樁間距為 400mm 沿支護(hù)樁外側(cè)設(shè)置二排水泥采用 PO 325 水泥用量不小于 50kgm 詳細(xì)參數(shù)見表 32 表 32 粉噴樁設(shè)計(jì)參數(shù) 分段號(hào) 止水帷幕 工藝 樁頂標(biāo)高 m 樁徑 mm 樁長 m 樁間距 mm 備注 AIJ 深層攪拌樁 1690 500 900 400 400 雙排 第四章 支護(hù)樁設(shè)計(jì) 本段基坑采用大直徑鉆孔灌注樁作為支護(hù)主體支護(hù)樁樁徑為 1m間距 14m樁身強(qiáng)度為 C30 本基坑支撐布置原則是力求支撐體系受力堆成受力特征明確充分發(fā)揮各桿件的 作用并能在穩(wěn)定性和控制變形方面滿足對(duì)周圍環(huán)境控制的要求同時(shí)最大限度地方便土體開挖和主題結(jié)構(gòu)的快速施工以及材料回收利用本段基坑支撐主要采用對(duì)撐形式盡量減少支撐桿件數(shù)量方便土方的挖運(yùn) 通過勘查報(bào)告可知 AIJ 段基坑地層及底層厚度具體參數(shù)和各地層厚度見表41 表 41 AIJ 段基坑地層計(jì)算參數(shù)及厚度 層號(hào) 土層 名稱 重度γ KNM3 粘聚力 CkPa 內(nèi)摩擦角 176。深基坑畢業(yè)設(shè)計(jì) 廣場 AIJ 段基坑支護(hù)設(shè)計(jì) 本科生畢業(yè)論文設(shè)計(jì) 題目 廣場 AIJ 段基坑支護(hù)設(shè)計(jì) 姓 名 學(xué)號(hào) 院 系 土木工程學(xué)院 專業(yè) 工 程 力 學(xué) 指導(dǎo)教師 職稱 評(píng) 閱 人 職稱 二 0 一三 年 六 月 摘 要 隨著城市化過程中不斷涌現(xiàn)的中高層和超高層 建筑以及對(duì)地下空間的開發(fā)就產(chǎn)生了大量的深基坑在基坑開挖過程中必然會(huì)涉及到基坑的支護(hù)而基坑支護(hù)不僅會(huì)影響工程的進(jìn)度也會(huì)影響到工程安全本論文主要對(duì)武漢萬達(dá)廣場 AIJ 段基坑支護(hù)結(jié)構(gòu)進(jìn)行設(shè)計(jì)及穩(wěn)定性驗(yàn)算 廣場基坑分為 AB 基坑兩塊呈呂字型分布總占地面積約 57000 基坑開挖深度都在 10m 左右屬于深基坑 AIJ 段基坑處地層主要有雜填土粘土淤泥質(zhì)粉質(zhì)粘土粉土夾粉砂粉砂粉細(xì)砂地下水類型主要為上層滯水和第四系空隙承壓水基坑支護(hù)主要采用鉆孔灌注工藝的支護(hù)樁進(jìn)行支護(hù)同時(shí)在基坑上部減載放坡坑壁設(shè)置粉噴樁止水帷幕 在進(jìn)行支護(hù)樁設(shè)計(jì)計(jì) 算時(shí)土壓力計(jì)算采用郎肯土壓力理論水土合算被動(dòng)土壓力折減系數(shù)取 10 支護(hù)樁的長度和入土深度采用極限土壓力平衡理論和等值梁法計(jì)算確定支護(hù)樁樁長為 145m 求取支護(hù)樁的最大彎矩后可以按《混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范》 GB500102021 中有關(guān)公式求支護(hù)樁的配筋此段基坑支護(hù)樁配筋為 32 在通過配筋驗(yàn)算后還要對(duì)此段基坑的穩(wěn)定性進(jìn)行驗(yàn)算采用里正軟件分析基坑的整體穩(wěn)定性基坑底的隆起和基坑的管涌及沖潰通過驗(yàn)算可知 AIJ 段基坑支護(hù)設(shè)計(jì)滿足基坑的穩(wěn)定性要求 關(guān)鍵詞 深基坑 深基坑維護(hù) 支護(hù)設(shè)計(jì) 穩(wěn)定性 ABSTRACT With the urbanization process highrise buildings and supertall buildings are continuously emerging and underground space development project bee more and more As a result it generated a lot of deep excavation projects In the process of excavation it inevitably involves the support of excavation pit And the excavation will not only affect the progress of the project it will also affect engineering safety This paper mainly studys the design of supporting structure and stability putations of the AIJ section in Wanda Plaza pit Wuhan Wanda Plaza Foundation pit is divided into A B sections On the plane its distribution likes the figure of 呂 type The total area of Wanda Plaza Foundation pit is about 57000m 2 excavation depth is about 10m belonging to deep foundation pit The AIJ Section of Foundation pit is mainly fill with clay silty clay silty soil clip silty sand silt and fine sand groundwater types are mainly perched water and Quaternary confined pore water pit support mainly take bored piles supporting technology load shedding on the upper foundation pit wall set DJM waterproof curtain During the design calculations of supporting piles earth pressure calculated using the theory of King soil and water costeffective and passive earth pressure reduction factor of length and embedded depth of pile are designed with limit equilibrium theory and the earth pressure equivalent beam method Through calculation pile length is 145m solving the pile imum moment can see the code design of concrete structures GB500102021 In the section of pit the pile reinforcement use 32Φ28 Finally the stability of pit uplift of the pit bottom the piping are checked by the software of LiZheng Through the checking known the supporting design of AIJ Section meet the foundations stability Key words deep foundation maintenance of deep foundation su
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