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土木工程專業(yè)--公寓邊坡支護(hù)施工方案設(shè)計開題報告-wenkub.com

2025-11-23 09:48 本頁面
   

【正文】 Single soil nail at the garden arc sliding surface crack the solid and the limit of the soil anchor railroad cars/containers puting。50 s through the paper deals with the soil retaining structure have a new development, in the foundation pit excavation pile built before, underground continuous wall, such as the use of sheet pile soil layer on the pull back to form the retaining wall. 10 years after the structure in the wall, it is to use concrete ponent are arranged in excavation in the process of surface soil layer, with anchor to pull back, this is a kind of can and engineers projects at the same time the way in the operations. In the s there the reinforced wall, be in monly fill zones such as road, land leveling fill form in the area of the retaining wall, in layered backfilling when reclaiming earthworks layered lay out the geotextiles and in TongMianBan prefabricated Rachel, formation of the retaining wall. In the 70 s the soil nailed wall, 1972 French contractor in the French Versailles city railway slope excavation is successful application. 1979 Paris international soil reinforcement after the conference in the west has been extensively applied, held in 1990 in the United States of the international conference on retaining wall, the soil nailed wall as a separate project and bolt for retaining wall, make it bee an independent soil reinforcement subject branch The soil nailed wall of the characteristics and application areas The soil nailed wall applied in excavation support and grade of slope stability has the following features: 1 forming soil nail plex, improve the overall stability of the slope and under the slope overloading the ability. 2 the construction equipment simple, because the nail than the length of the general much smaller, do not add prestressed so simple equipment. 3 along with the foundation pit excavation work by subsection, do not take or less homework time alone accounted for, construction efficiency is tall, take up the cycle is short. 4 construction do not need to take up the alone, the site is narrow, put slope difficulties, it is adjacent buildings demonstrate its advantages. 5 the soil nailed wall cost significantly lower than other supporting structure. 6 construction noise, vibration small, do not affect the environment. 7 the soil nailed wall itself deformation is very small, the impact is not big to adjacent buildings. The soil nailed wall application fields The soil nailed wall not only applied to temporary support structure, and also used in permanent structures, when applied to permanent structures, appropriate increase jet concrete surface layer thickness and due consideration of its beautiful, at present the soil nailed wall the application field of mainly has: 1 the foundation underpinning 2 the foundation pit retaining or shaft 3 the retaining wall slope 4 the slope stability 5 and bolt for the protection of the retaining wall with cant Drilling grouting soil nailing wall type of excavation way down step by step, every step for 1 ~ 2 meters high, in construction soil nail bar, concrete road surface spray, during the period of slope in the state without support needs to be able to keep independent stable, so is mainly applied in: 1 have certain of the bonding miscellaneous fill earth, cohesive soil, powder soil, loess and weakly cemented of soil slope. 2 application to underground water level below the excavation layer or after rainfall make underground water level elevation below the excavation. 3 for standard peration and several N of soil slope under 10 strike by soil nail method usually don39。2021 13 張永興,重慶大學(xué),邊坡工程學(xué),中國建筑工業(yè)出版社, 2021 版 14 趙明階 ,邊坡工程處治技術(shù),人民交通出版社, 2021 版 15 徐燕,代樹林,邊坡工程,科學(xué)出版社有限責(zé)任公司, 2021 版 16 深基坑順向巖層高邊坡的支護(hù)施工建筑技術(shù)開發(fā) 2021? ? 06? ?多形式支護(hù)體系在城市高邊坡支護(hù)工程中的綜合應(yīng)用施工技術(shù) 2021? ? S1?姚裕春 [D]。 12 詹永祥 ?;庸こ淌謨?。 參考文獻(xiàn) 1 《建筑基坑支護(hù)技術(shù)規(guī)程》 JGJ12099 中國建筑工業(yè)出版社出版 2 《建筑 施工計算手冊》江正榮 編著 中國建筑工業(yè)出版社、 3 《地基與基礎(chǔ)》第三版 中國建筑工業(yè)出版社、 4 《土力學(xué)》 5 賀利民;復(fù)合式土釘墻的穩(wěn)定性及作用機(jī)理研究;西安建筑科技大學(xué)學(xué)位論文; 6 東南大學(xué),浙江大學(xué);土力學(xué);中國建筑工業(yè)出版社; 7 王樹理;地下建筑結(jié)構(gòu)設(shè)計;清華大學(xué)出版社; 8 何敏;深基坑支護(hù)設(shè)計及穩(wěn)定性數(shù)值模擬分析;貴州大學(xué)學(xué)位論文; 9 陳肇元,崔京浩 。 2 設(shè)計中發(fā)現(xiàn),隨著土釘長度的變化,土釘內(nèi)力也逐步變化。 工序管理及信息反饋 1 各觀測點和基準(zhǔn)點要嚴(yán)格保護(hù)并做明顯標(biāo)記。 2 位移監(jiān)測預(yù)警 邊坡坡頂水平位移預(yù)警值為基坑深度的 %,為 27mm 發(fā)現(xiàn)坡頂位移與當(dāng)時基坑開挖深度之比超過 %時及時采取措施處理。一般用經(jīng)緯儀正倒鏡 4 次讀數(shù)取中數(shù),作為一次觀測。 觀測點的保護(hù):在施工過程中,加強(qiáng)對觀測點的保護(hù),不得隨意破壞。 1 級坡: KQ ,滿足要求! [計算結(jié)果 ] 重力: ( kN) 重心坐標(biāo): ( , ) 超載: ( kN) 超載作用點 x 坐標(biāo): ( m) 土壓力: ( kN) 土壓力作用點 y 坐標(biāo): ( m) 基底平均壓力設(shè)計值: ( kPa) 基底邊緣最大壓力設(shè)計值: ( kPa) * 抗滑安全系數(shù): 抗傾覆安全系數(shù): 邊坡變形監(jiān)控施工方案 開挖監(jiān)控目的、項目 1 監(jiān)控目的 在基礎(chǔ)施工及維護(hù)階段,由于工程的基礎(chǔ)較深,開挖面積較大,施工中可能會出現(xiàn)基坑變形,為確保邊坡的安全穩(wěn)定和工程順利進(jìn)行,及時掌握基坑邊坡變形動態(tài),便于采取各種保護(hù)措施,在基礎(chǔ)施工過程中需對邊坡進(jìn)行水平位移監(jiān)測。 層號 有效長度 m 抗拉承載力 kN 受拉荷載標(biāo)準(zhǔn)值 kN 初算長度 m 安全性 1 滿足 2 滿足 第 1 號土釘鋼筋的直徑 ds 至少應(yīng)取: mm; 第 2 號土釘鋼筋的 直徑 ds 至少應(yīng)?。? mm; 土釘墻整體穩(wěn)定性的計算 : 根據(jù)《規(guī)程》 JGJ 12099 要求,土釘墻應(yīng)根據(jù)施工期間不同開挖深度及基坑底面以下可能滑動面采用圓弧滑動簡單條分法如下圖,按照下式進(jìn)行整體穩(wěn)定性驗算: 公式中: n 滑動體條分?jǐn)?shù) m 滑動體內(nèi)土釘數(shù) γ k 滑動體分項系數(shù),取 γ 0 基坑側(cè)壁重要系數(shù); wi 第 i 條土重; bi 第 i 分條寬度; cik 第 i 條滑土裂面處土體粘結(jié)力; φ ik 第 i 條滑土裂面處土體的內(nèi)摩擦角; θ i 第 i 條土滑裂面 處中點切線與平面夾角; α j 土釘與水平面之間的夾角; Li 第 i 條土滑裂面的弧長; S 計算滑動體單元厚度,即第 i 條土條平均高度 hi; Tnj 第 j 根土釘在圓弧滑裂面外錨固與土體的極限抗拉力,按下式計算。 φ 土的內(nèi)摩擦角 eajk 按根據(jù)土力學(xué)按照下式計算: 土釘抗拉承載力設(shè)計值 Tuj 按照下式計算 其中 dnj 土釘?shù)闹睆?。? 墻背傾角 (176。 縮短邊坡監(jiān)測周期,同時盡快分析事故原因,找出最有效的解決方案避免事故繼續(xù)惡化,保證工程順利進(jìn)行。 邊坡可采取設(shè)置導(dǎo)流花管的方法將土體中水導(dǎo)出,基槽內(nèi)設(shè)置盲溝和集水井,用水泵將水盡快排出基槽。 4 基坑開挖過程中因土質(zhì)較松散而發(fā)生局部土體不穩(wěn)定時,可采用的方法有: 視土質(zhì)情況減小土方開挖深度。 已縮頸的土釘孔應(yīng)二次成孔以保證孔徑;若二次成孔無法保證孔徑,應(yīng)在相鄰處補(bǔ)孔; 若現(xiàn)場地層情況與原勘察報告有較大出入,縮頸、塌孔嚴(yán)重而無法用
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