本文選題：圍堰 + 鋼板樁　； 參考：《湘潭大學(xué)》2015年碩士論文

【摘要】：鋼板樁圍堰是最常見(jiàn)的防水圍堰形式,尤其在水下承臺(tái)、水下墩(臺(tái))身施工中,它不僅可以作為封底混凝土的模板,而且能和混凝土共同作用起到防水作用,在圍堰施工中還可以作為擋水結(jié)構(gòu)。在鋼板樁圍堰施工方案計(jì)算中,傳統(tǒng)的計(jì)算方法采用的簡(jiǎn)化計(jì)算模型,土層間距一般取經(jīng)驗(yàn)值,少有文獻(xiàn)報(bào)道研究。本文以萍洲大橋8#墩圍堰為工程背景,采用Midas/Civil和Abaqus CAE等軟件,對(duì)圍堰施工方案進(jìn)行設(shè)計(jì)和受力計(jì)算,計(jì)算內(nèi)容主要包括鋼板樁“踢腳”失穩(wěn)計(jì)算、鋼板樁圍堰抗管涌計(jì)算、封底混凝土厚度計(jì)算、鋼板樁結(jié)構(gòu)計(jì)算、內(nèi)支撐結(jié)構(gòu)計(jì)算、強(qiáng)度剛度驗(yàn)算和壓桿失穩(wěn)計(jì)算等。本文中所使用的方案計(jì)算方法方便快捷,是現(xiàn)今施工中常用的計(jì)算方法。本方案設(shè)計(jì)中土層間距經(jīng)驗(yàn)取值為1m,本文通過(guò)改變土彈簧計(jì)算中的土層間距,得到不同的彈簧系數(shù)K值,作用到計(jì)算模型中而得到了多種不同計(jì)算結(jié)果,與有限元分析軟件所建模型進(jìn)行對(duì)比,并得出結(jié)論。主要的研究?jī)?nèi)容如下:(1)在實(shí)際工程中,一般采用簡(jiǎn)化計(jì)算的方法進(jìn)行施工方案設(shè)計(jì)。這種計(jì)算方法方便快捷,因此被廣泛使用。本文采用此類(lèi)計(jì)算方法對(duì)萍洲大橋8#墩圍堰進(jìn)行設(shè)計(jì)和受力計(jì)算,把土體簡(jiǎn)化成一個(gè)具有彈性系數(shù)的彈性支撐。(2)在模型簡(jiǎn)化過(guò)程中,土層間距的取值采用的經(jīng)驗(yàn)值,本文通過(guò)對(duì)此值進(jìn)行改變,采用六個(gè)對(duì)照組并與有限元模型進(jìn)行對(duì)比,發(fā)現(xiàn)簡(jiǎn)化計(jì)算在一定程度可以反映結(jié)構(gòu)的實(shí)際受力情況,但取值過(guò)大或過(guò)小會(huì)對(duì)結(jié)果造成不良的影響。(3)通過(guò)對(duì)照組中得出在進(jìn)行簡(jiǎn)化計(jì)算的過(guò)程中,對(duì)土彈簧K值進(jìn)行取值時(shí),土層間距不可過(guò)大,也不宜過(guò)小,取0.5、1.0、1.5都比較接近模擬值。從本文中可以看出應(yīng)力值隨間距增大而增大同,彎矩值隨間距增大而增大,位移隨間距增大而增大,剪力隨間距增大而增大。
[Abstract]:Steel sheet pile cofferdam is the most common waterproof cofferdam, especially in the underwater pile cap, underwater pier (platform) construction, it can not only be used as the bottom concrete template, but also can work with concrete to play a waterproof role.In the construction of cofferdam, it can also be used as a water retaining structure.In the calculation of the construction scheme of steel plate pile cofferdam, the simplified calculation model is adopted in the traditional calculation method, and the interval between the soil layers is generally taken as the empirical value, which is seldom reported in the literature.In this paper, based on the engineering background of the cofferdam of Pinzhou Bridge, using Midas/Civil and Abaqus CAE software, the design and stress calculation of cofferdam construction scheme are carried out. The calculation contents mainly include the calculation of "kick foot" instability of steel sheet pile and the calculation of pipe bore resistance of steel plate pile cofferdam.The bottom concrete thickness calculation, plate pile structure calculation, internal support structure calculation, strength and stiffness check calculation and compression rod instability calculation and so on.The calculation method used in this paper is convenient and quick, and it is commonly used in construction nowadays.The empirical value of soil spacing is 1 m in the design of this scheme. By changing the interval between soil layers in the calculation of soil springs, different spring coefficients K are obtained, and many different calculation results are obtained by acting on the calculation model.The model is compared with the finite element analysis software, and the conclusion is drawn.The main research contents are as follows: (1) in practical engineering, the simplified calculation method is generally used to design the construction scheme.This calculation method is convenient and fast, so it is widely used.This paper uses this kind of calculation method to carry on the design and the force calculation to the piers cofferdam of Pinzhou Bridge, and simplifies the soil mass into an elastic bracing with elastic coefficient.By changing this value, using six control groups and comparing with the finite element model, it is found that the simplified calculation can reflect the actual stress of the structure to a certain extent.However, too large or too small value will have a bad effect on the result.) in the control group, it is concluded that in the process of simplified calculation, the interval between soil layers should not be too large or too small when the K value of soil spring is taken.The values of 0.5 ~ 1.0 ~ (-1) U ~ (1.5) are close to the simulated values.It can be seen from this paper that the stress value increases with the increase of spacing, the moment value increases with the increase of spacing, the displacement increases with the increase of spacing, and the shear force increases with the increase of spacing.
【學(xué)位授予單位】：湘潭大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：U445.556

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