本文選題：全封閉止水 + 地下水位　； 參考：《石家莊鐵道大學(xué)》2015年碩士論文

【摘要】：本文研究了濱海軟土地區(qū)近接高鐵頂進(jìn)鐵路立交橋綜合施工技術(shù),具體來說,可以分為以下幾個方面:(1)全封閉止水方案設(shè)計。本工程地層軟弱,地下水位較高,工程止水方案設(shè)計為:框構(gòu)工作坑及U型槽基坑開挖后不滲不漏,實現(xiàn)無水施工;頂橋降水頂進(jìn)期間,線間止水帷幕滲透系數(shù)控制在1×108 m/s以下,從而避免由于地下水位下降引起的地層有效應(yīng)力增加造成的路基下沉。(2)全封閉止水施工技術(shù)研究。本工程止水帷幕樁長最大21 m,距離既有京津城際最近2.5 m,本文通過城際剛構(gòu)橋下止水帷幕及封底旋噴樁試驗確定了施工工藝參數(shù),為工程順利進(jìn)行提供了保證。(3)基坑開挖技術(shù)研究。本工程基坑開挖深度雖然最大只有6 m,但是由于地層軟弱、地下水位較高,提高了施工難度。本文應(yīng)用PLAXIS有限元軟件模擬基坑開挖對既有線的影響程度,從而確定了合理的基坑開挖步序。(4)施工監(jiān)測技術(shù)研究。運營中的京津城際附加差異沉降不得大于1 mm,為達(dá)到控制標(biāo)準(zhǔn)要求,本文采用SMAIS(自動化管理與分析系統(tǒng)),研究制定了合理的監(jiān)測手段及監(jiān)測方法。
[Abstract]:This paper studies the comprehensive construction technology of the overpass of the railway with high speed and entering the railway near the seaside soft soil area. Specifically, it can be divided into the following aspects: 1) the design of the completely closed watertight scheme. In this project, the stratum is weak and the underground water level is high. The design of the watertight project is as follows: no seepage and leakage after excavation of the frame working pit and U-groove foundation pit, and no water construction during the dewatering of the top bridge, The permeability coefficient of the interline waterproof curtain is controlled below 1 脳 10 ~ 8 m / s, so as to avoid the subgrade subsidence caused by the increase of effective stress in the formation caused by the decrease of groundwater level. The maximum length of the waterproof curtain pile in this project is 21 m, and the nearest 2.5 m from the existing Beijing-Tianjin city. This paper determines the construction technical parameters through the test of the waterproof curtain under the inter-city rigid frame bridge and the bottom rotating grouting pile. The research on excavation technology of foundation pit is provided to ensure the smooth progress of the project. Although the excavation depth of foundation pit of this project is only 6 m, it is difficult to construct because of weak stratum and high groundwater level. In this paper, PLAXIS finite element software is used to simulate the influence of foundation pit excavation on existing railway lines, so as to determine the reasonable construction monitoring technology. The additional differential settlement between Beijing and Tianjin should not be greater than 1 mm in operation. In order to meet the requirements of control standard, this paper adopts SMAIS (automatic Management and Analysis system) to study and establish reasonable monitoring means and methods.
【學(xué)位授予單位】：石家莊鐵道大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U445.4

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