本文選題：涵洞　切入點：填土性質(zhì)　出處：《太原理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著我國經(jīng)濟(jì)的高速發(fā)展，涉及民生的基本建設(shè)也在蓬勃發(fā)展。而涵洞作為最常見的一種工程建筑，廣泛應(yīng)用于水利、公路、鐵路、土木、市政等工程領(lǐng)域。 本文通過ANSYS有限元分析軟件，，就箱涵和半圓拱涵在不同性質(zhì)填土條件下的土壓力進(jìn)行正交試驗研究，找出最敏感的填土性質(zhì)指標(biāo)，在此基礎(chǔ)上對覆土中小主應(yīng)力偏轉(zhuǎn)軌跡線進(jìn)行簡要分析。主要結(jié)論如下： （1）砂性土填埋下的箱型涵洞，填土內(nèi)摩擦角對土壓力的影響最大，隨著內(nèi)摩擦角的增大，土壓力系數(shù)先快速增大，后趨于平穩(wěn)。 （2）粘性土填埋下的箱型涵洞，填土泊松比對土壓力的影響最大，土壓力系數(shù)隨著泊松比的增大呈現(xiàn)下降趨勢，且在全區(qū)間內(nèi)，下降速率基本相同。 （3）砂性土填埋的半圓拱涵，填土內(nèi)摩擦角對土壓力的影響最大，土壓力系數(shù)隨著內(nèi)摩擦角的增大而增大，其增長速率越來越慢。 （4）粘性土填埋的半圓拱涵,填土泊松比對土壓力系數(shù)的影響最大，土壓力系數(shù)隨著泊松比的增大出現(xiàn)下降趨勢，且在泊松比μ0.37的區(qū)間，下降速率相對較大。 （5）填土為砂性土的情況下，填土內(nèi)摩擦角為其最敏感因素。箱涵頂部填土的小主應(yīng)力軌跡線偏轉(zhuǎn)程度隨著內(nèi)摩擦角的增大而增大；半圓拱涵頂部填土的小主應(yīng)力的偏轉(zhuǎn)程度幾乎不隨填土內(nèi)摩擦角的變化而變化。 （6）填土為粘性土的情況下，填土泊松比為最敏感因素。箱涵頂部填土的小主應(yīng)力的偏轉(zhuǎn)程度隨著泊松比的增大而增大。半圓拱涵頂部填土的小主應(yīng)力的偏轉(zhuǎn)隨著泊松比的增大而有所增大。在各工況下，小主應(yīng)力軌跡線的偏轉(zhuǎn)程度都隨著距涵頂高度的增大而減小。等沉面以上小主應(yīng)力軌跡線水平。
[Abstract]:With the rapid development of China's economy, the capital construction involving people's livelihood is booming. As the most common engineering building, culvert is widely used in water conservancy, highway, railway, civil engineering, municipal engineering and other fields. In this paper, the earth pressure of box culvert and semi-circular arch culvert under different filling conditions is studied by means of ANSYS finite element analysis software, and the most sensitive index of filling property is found out. On this basis, a brief analysis of the trajectory of the small and medium principal stress deflection in overlying soil is carried out. The main conclusions are as follows:. 1) for box culverts filled with sandy soil, the internal friction angle of the fill has the greatest influence on the earth pressure. With the increase of the internal friction angle, the coefficient of soil pressure increases rapidly and then tends to steady. (2) in the box culvert filled with cohesive soil, the Poisson ratio has the greatest influence on the earth pressure, and the coefficient of soil pressure decreases with the increase of Poisson's ratio, and the decreasing rate is basically the same in the whole region. (3) in the semi-circular arch culvert filled with sandy soil, the internal friction angle of the fill has the greatest influence on the earth pressure, and the coefficient of the earth pressure increases with the increase of the internal friction angle, and the growth rate of the soil pressure coefficient increases more and more slowly. (4) in the semi-circular arch culvert filled with clayey soil, Poisson's ratio has the greatest influence on the coefficient of soil pressure, and the coefficient of soil pressure decreases with the increase of Poisson's ratio, and the decreasing rate is relatively large in the range of Poisson's ratio 渭 0.37. (5) when the fill is sandy, the internal friction angle of the fill is the most sensitive factor. The degree of small principal stress trajectory deflection increases with the increase of the internal friction angle at the top of the box culvert. The degree of deflection of minor principal stress at the top of the arch culvert is almost unchanged with the change of the angle of friction within the fill. If the fill is clay, Poisson's ratio of fill is the most sensitive factor. The degree of deflection of small principal stress of top fill of box culvert increases with the increase of Poisson's ratio. The deflection of small principal stress of top fill of semi-circular arch culvert increases with the increase of Poisson's ratio. The degree of deflection of the small principal stress locus decreases with the increase of the height from the culvert top.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU432

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