發(fā)布時(shí)間：2018-05-28 22:39

  本文選題：沉井 + 高水位　； 參考：《天津大學(xué)》2014年碩士論文

【摘要】：隨著工業(yè)規(guī)模的迅速擴(kuò)大化,工業(yè)設(shè)備基礎(chǔ)也呈現(xiàn)大型化的趨勢(shì),我們?cè)谑┕ぶ胁豢杀苊獾挠龅捷^深的水池及設(shè)備基礎(chǔ),如果在施工場(chǎng)地附近,地下水位較高,通常在工程中會(huì)運(yùn)用沉井的施工方法,有時(shí)采用沉井還進(jìn)行水下封底,以上是基于確定基礎(chǔ)的施工質(zhì)量和進(jìn)度。作為一種基礎(chǔ)結(jié)構(gòu),沉井相當(dāng)于是上部荷載傳遞的載體,最終由地基承擔(dān)。首先,通過(guò)凌鋼十二五結(jié)構(gòu)調(diào)整技術(shù)改造公輔項(xiàng)目翻車(chē)機(jī)室沉井制作工程,詳細(xì)介紹了在高水位下的大長(zhǎng)寬比沉井從設(shè)計(jì)、制作到施工的整個(gè)過(guò)程,包括工程背景,設(shè)計(jì)思路,沉井的制作、施工降排水、沉井下沉系數(shù)及抗浮驗(yàn)算、沉井的施工等主要步驟。在施工中發(fā)現(xiàn)了枕木抽取困難的現(xiàn)象,只有少量的枕木完整的抽出。對(duì)沉井的施工以及在其過(guò)程中所可能出現(xiàn)的問(wèn)題進(jìn)行分析和研究,得出了沉井施工中的容易出現(xiàn)的問(wèn)題和有效控制和處理方法,得出了在以后的施工中采用無(wú)枕木施工法,根據(jù)預(yù)制沉井的重量,增加刃腳下砂墊層的厚度,分層夯實(shí),在刃腳與砂墊層之間澆筑砼墊層。下沉前用大錘、風(fēng)鎬等將砼墊層破碎,即可挖土下沉的建議。為高水位下的大長(zhǎng)寬比沉井的施工提供了合理的施工方案和有效的控制方法。其次,通過(guò)PLAXIS有限元軟件,模擬了大長(zhǎng)寬比沉井的井壁土壓力和變形特點(diǎn),通過(guò)計(jì)算發(fā)現(xiàn):沉井具有很強(qiáng)的空間效應(yīng),井壁在邊角處側(cè)向位移較小,在中央處側(cè)向位移最大,整體呈“踢腳”的變形狀態(tài);沉井長(zhǎng)邊的側(cè)向位移遠(yuǎn)遠(yuǎn)大于短邊的側(cè)向位移,長(zhǎng)邊的側(cè)向位移更應(yīng)該加以重視,必要時(shí)需要設(shè)置隔墻,以達(dá)到減小位移的目的。本文通過(guò)實(shí)際工程和有限元模擬,給出了高水位下的大長(zhǎng)寬比沉井的設(shè)計(jì)和施工的建議,為實(shí)際工程提供了參考。
[Abstract]:With the rapid expansion of industrial scale, the industrial equipment foundation also presents the trend of large-scale, we inevitably encounter deeper pool and equipment foundation in the construction, if the underground water level is higher near the construction site, The caisson construction method is usually used in engineering, and sometimes the caisson is used to seal the bottom underwater. The above is based on determining the construction quality and schedule of the foundation. As a foundation structure, the caisson is equivalent to the upper load transfer carrier, which is ultimately borne by the foundation. First of all, through the engineering of the sinking well in the overturning chamber of the 12th Five-Year structural Adjustment Technical Transformation Project of Linggang, the whole process from design, manufacture to construction of the caisson with large aspect ratio under high water level is introduced in detail, including the engineering background and design ideas. The main steps such as the production of caisson, drainage, sinking coefficient and anti-floating checking calculation, construction of caisson, etc. In construction, the phenomenon of difficult extraction of sleepers is found, and only a small number of sleepers are extracted completely. Based on the analysis and study of the construction of caisson and the problems that may appear in the process of caisson construction, the easy problems in caisson construction and the effective control and treatment methods are obtained, and the non-sleeper construction method is adopted in the later construction. According to the weight of prefabricated caisson, the thickness of sand cushion at the foot of the blade is increased, the layer is rammed and the concrete cushion is placed between the blade foot and the sand cushion. Before sinking, the concrete cushion can be broken with hammer and pick. It provides a reasonable construction scheme and effective control method for the construction of the caisson with large aspect ratio under high water level. Secondly, the characteristics of borehole wall earth pressure and deformation of caisson with large aspect ratio are simulated by PLAXIS finite element software. Through calculation, it is found that the caisson has strong spatial effect, the lateral displacement of shaft wall is smaller at the edge corner and the maximum lateral displacement is at the center. The lateral displacement of the long side of the caisson is far greater than that of the short side, and the lateral displacement of the long side should be paid more attention to, and the partition wall should be set up when necessary to reduce the displacement. Through practical engineering and finite element simulation, this paper gives some suggestions for the design and construction of large aspect ratio caisson under high water level, which provides a reference for practical engineering.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TU753.64

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本文編號(hào)：1948456