本文選題：軟土地基 + 天然閘基�。� 參考：《揚(yáng)州大學(xué)》2014年碩士論文

【摘要】：本文借助三維有限元軟件ABAQUS和相關(guān)數(shù)學(xué)理論,對天然閘基、預(yù)制樁復(fù)合閘基和灌注樁閘基的滲流場進(jìn)行分析研究,同時(shí)深入分析三種閘基對滲流場的影響,最后對降雨入滲時(shí)滲流場與應(yīng)力場的耦合作用進(jìn)行研究。全文主要研究內(nèi)容如下： (1)闡述滲流的基本概念,介紹滲流場有限元數(shù)值分析的基本原理和穩(wěn)定滲流場的變分原理,確定滲流場的初始條件和邊界條件,引進(jìn)大型有限元軟件ABAQUS,對其用于滲流場分析研究的可行性進(jìn)行分析,研究滲透坡降的有限元計(jì)算方法。 (2)基于實(shí)際工程焦土港閘,建立天然軟土地基和預(yù)制樁復(fù)合閘基滲流的三維有限元模型,分析其滲透水頭、應(yīng)力、位移和滲透坡降的分布,并對天然軟土地基和預(yù)制樁復(fù)合閘基的各要素進(jìn)行對比分析。 (3)基于實(shí)際工程丁樓閘,建立灌注樁閘基滲流的三維有限元模型,考慮灌注樁擾動(dòng)區(qū)范圍內(nèi)滲透系數(shù)的三種變化模式,因此對灌注樁樁周特征位置的滲流進(jìn)行分析研究。比較三種模式下滲透水頭、應(yīng)力、位移和滲透坡降的分布,分析灌注樁閘基區(qū)域和擾動(dòng)區(qū)內(nèi)的滲流特性。 (4)考慮上部結(jié)構(gòu)荷載的影響,建立閘基在不同荷載作用下的有限元模型,分析天然閘基和預(yù)制樁復(fù)合閘基各特征點(diǎn)的滲透水頭、應(yīng)力、位移和滲透坡降。并且對影響較大的參數(shù)進(jìn)行了擬合,找出相應(yīng)的變化規(guī)律。對比兩種閘基下滲透水頭、應(yīng)力、位移、坡降的變化曲線,計(jì)算預(yù)制樁閘基的消力池護(hù)坦防滲作用影響值,分析預(yù)制樁基礎(chǔ)對滲流的影響。 (5)采用基質(zhì)吸力—飽和度—滲透系數(shù)耦合模型和Mohr-Coulomb屈服準(zhǔn)則,建立某水閘的滲流場與應(yīng)力場耦合的三維有限元模型,分析研究72h內(nèi)降雨入滲時(shí)兩岸土體和閘基土體的應(yīng)力、應(yīng)變、飽和度、等效塑應(yīng)變隨時(shí)間的變化關(guān)系。
[Abstract]:In this paper, the seepage field of natural sluice foundation, prefabricated pile composite gate foundation and cast-in-place pile sluice foundation is analyzed with the help of three-dimensional finite element software ABAQUS and related mathematical theory. At the same time, the influence of three kinds of sluice foundation on seepage field is analyzed deeply. Finally, the coupling effect of seepage field and stress field during rainfall infiltration is studied. The main contents of this paper are as follows: 1) the basic concept of seepage flow is expounded, the basic principle of finite element numerical analysis of seepage field and the variational principle of steady seepage field are introduced, and the initial conditions and boundary conditions of seepage field are determined. A large-scale finite element software Abaqus was introduced to analyze the feasibility of the seepage field analysis and the finite element calculation method of seepage slope was studied. (2) based on the actual construction of the scorched earth sluice gate, a three-dimensional finite element model for seepage of natural soft soil foundation and prefabricated pile composite sluice foundation is established, and the distribution of seepage head, stress, displacement and seepage slope is analyzed. The factors of natural soft soil foundation and prefabricated pile composite gate foundation are compared and analyzed. 3) based on the practical construction of Tinglou sluice, a three-dimensional finite element model of foundation seepage of cast-in-place pile sluice is established. Considering the three modes of variation of permeability coefficient in the disturbance zone of cast-in-place pile, the percolation around characteristic position of cast-in-place pile is analyzed and studied. By comparing the distribution of seepage head, stress, displacement and seepage slope in three different modes, the percolation characteristics of foundation region and disturbed zone of cast-in-place pile are analyzed. Considering the influence of superstructure load, the finite element model of sluice foundation under different loads is established, and the seepage head, stress, displacement and seepage slope of each characteristic point of natural gate foundation and prefabricated pile composite gate foundation are analyzed. And the parameters which have a great influence are fitted to find out the corresponding law of change. By comparing the change curves of seepage head, stress, displacement and slope under the two kinds of sluice foundation, the influence value of anti-seepage effect of the stilling pool of prefabricated pile sluice foundation is calculated, and the influence of prefabricated pile foundation on seepage is analyzed. In this paper, the coupling model of matrix suction, saturation and permeability coefficient and Mohr-Coulomb yield criterion are used to establish a three-dimensional finite element model for coupling seepage field and stress field of a sluice. The stress of soil and sluice foundation soil under rainfall infiltration within 72 hours is analyzed and studied. The relationship between strain, saturation, equivalent plastic strain and time.
【學(xué)位授予單位】：揚(yáng)州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TV66;TV223.4

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本文編號：1985961