本文關(guān)鍵詞： 路基 數(shù)值模擬 鄧肯-張模型 差異進(jìn)化 反分析 滲流　出處：《大連海事大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：交通運(yùn)輸業(yè)關(guān)系著國民經(jīng)濟(jì)命脈,它的進(jìn)步與變革直接關(guān)系到生產(chǎn)力的發(fā)展與提高。作為運(yùn)輸系統(tǒng)中核心環(huán)節(jié)的公路,在基礎(chǔ)設(shè)施建設(shè)中始終占據(jù)著重要地位。路基質(zhì)量的好壞,直接影響到路面或軌道的使用質(zhì)量,在其上部荷載的作用下,路基容易產(chǎn)生過量的殘余變形,表現(xiàn)為較大的工后沉降、不均勻沉降并開裂,且逐步反應(yīng)到路面。研究路基土的沉降機(jī)理,并建立路基沉降的計(jì)算模型對于保證路基質(zhì)量,保障交通運(yùn)輸安全具有重要的作用。本文基于實(shí)際的路基工程背景,進(jìn)行路基土變形規(guī)律研究。首先進(jìn)行了實(shí)際工程中土樣的土工試驗(yàn),獲得了土的基本物理性質(zhì)指標(biāo)和力學(xué)參數(shù)。通過試驗(yàn)研究了污染環(huán)境對水泥土的超聲波速的影響規(guī)律。然后利用研發(fā)的差異進(jìn)化和應(yīng)力回映彈塑性FEM程序進(jìn)行了所選路段進(jìn)行了路基沉降計(jì)算以及力學(xué)參數(shù)的反分析計(jì)算,解決了路基土參數(shù)的不確定性問題。考慮地下水對路基土的影響機(jī)理,采用流固耦合模型進(jìn)行路基土的數(shù)值模擬計(jì)算,分析滲流對與路基沉降的影響。最后考慮路基土應(yīng)力應(yīng)變的非線性特點(diǎn),研究了路基土的鄧肯張模型參數(shù)和計(jì)算方法,基于FLAC3D平臺二次開發(fā)了鄧肯張計(jì)算模型,模擬某路段路基沉降,分析各參數(shù)對路基沉降的不同影響。本論文的研究為進(jìn)一步理解路基沉降機(jī)理和開展相關(guān)計(jì)算,提供了理論依據(jù)及有效途徑,對類似的路基工程開展路基土變形規(guī)律的試驗(yàn)及數(shù)值模擬研究計(jì)算具有借鑒意義,結(jié)果和結(jié)論對于路基現(xiàn)場施工也具有積極的指導(dǎo)意義。
[Abstract]:Transportation industry is related to the lifeblood of the national economy, and its progress and transformation are directly related to the development and improvement of productive forces. The quality of roadbed has a direct impact on the quality of pavement or track. Under the action of upper load, the subgrade is prone to produce excessive residual deformation. It is shown as large post-construction settlement, uneven settlement and cracking, and gradually reflects to the pavement. The settlement mechanism of subgrade soil is studied, and the calculation model of subgrade settlement is established to ensure the quality of roadbed. Based on the background of the actual subgrade engineering, the deformation law of subgrade and soil is studied in this paper. First, the geotechnical test of soil sample in practical engineering is carried out. The basic physical properties and mechanical parameters of the soil were obtained. The influence of polluted environment on the ultrasonic velocity of cement soil was studied through experiments. Then the differential evolution and stress echo elastoplastic FEM program was developed. The subgrade settlement calculation and the back analysis calculation of mechanical parameters are carried out on the selected section. The uncertainty of subgrade soil parameters is solved. Considering the influence mechanism of groundwater on subgrade soil, the fluid-solid coupling model is used to simulate the roadbed soil. The influence of seepage on subgrade settlement is analyzed. Finally, considering the nonlinear characteristics of stress and strain of subgrade soil, the parameters and calculation method of Duncan-Chang model of subgrade soil are studied. Based on the FLAC3D platform, the Duncan-Chang calculation model is developed to simulate the subgrade settlement of a section of the road. This paper provides a theoretical basis and an effective way to further understand the mechanism of subgrade settlement and to carry out relevant calculation. It is useful for similar subgrade engineering to study and calculate the deformation law of subgrade and soil, and the results and conclusions are also helpful to the field construction of roadbed.
【學(xué)位授予單位】：大連海事大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U416.1

【參考文獻(xiàn)】

相關(guān)期刊論文 前2條

1 冷先倫;盛謙;朱澤奇;張占榮;;鄧肯—張模型在FLAC~(3D)中的實(shí)現(xiàn)及工程應(yīng)用[J];建筑科學(xué);2009年01期

2 王志亮,殷宗澤,李永池;鄧肯-張模型有限元分析路堤沉降實(shí)用方法[J];巖土力學(xué);2005年07期

，

本文編號：1453726