【摘要】：由于降雨入滲極易導(dǎo)致填方路基的失穩(wěn)甚至滑坡,因此對降雨條件下非飽和土填方路基的滲流及穩(wěn)定性變化進(jìn)行研究有相當(dāng)重要的意義。本文在系統(tǒng)歸納前人對降雨下的邊坡穩(wěn)定性研究和分析的成果基礎(chǔ)上,結(jié)合某一在運(yùn)行的實(shí)際高速公路作為工程實(shí)例背景,從而針對降雨入滲下非飽和土填方路基的穩(wěn)定性問題展開探討。作了如下工作:(1)對非飽和土的力學(xué)特性進(jìn)行了系統(tǒng)性論述。包括非飽和土的各相組成、有效應(yīng)力、基質(zhì)吸力、應(yīng)力狀態(tài)變量、非飽和土的強(qiáng)度理論與變形理論、基質(zhì)吸力與抗剪強(qiáng)度的關(guān)系以及基質(zhì)吸力變化引起的應(yīng)變等諸多方面。(2)對降雨入滲下的填方路基滲流場問題進(jìn)行了數(shù)值模擬分析。通過填方路基模型的建立以及對降雨后土體滲流場的變化規(guī)律進(jìn)行模擬,本文分析了路基滲流場在降雨強(qiáng)度、持續(xù)時(shí)間和類型三大因素下的影響。并且還研究分析了公路路基的滲流場在滲透系數(shù)等因素變化時(shí)的影響情況。(3)降雨條件下土體的位移變化分析。通過數(shù)值方法,模擬出填方路基在降雨滲流作用下位移的分布情況與發(fā)展規(guī)律。(4)考慮降雨入滲對填方路基穩(wěn)定性的影響。分析時(shí)把有限元強(qiáng)度折減法拓展應(yīng)用于非飽和土,求出路基的安全系數(shù),得出了相應(yīng)情況下安全系數(shù)的變化規(guī)律。(5)通過分析各種降雨因素對路基和邊坡帶來的影響,并對降雨后填方路基的滲流規(guī)律和邊坡穩(wěn)定性的分析結(jié)果進(jìn)行歸納和總結(jié),以期指導(dǎo)工程實(shí)際。
[Abstract]:As rainfall infiltration can easily lead to instability of embankment and even landslide, it is of great significance to study the seepage and stability of unsaturated soil embankment under rainfall conditions. In this paper, based on the research and analysis of slope stability under rainfall, a practical expressway is used as an engineering example. The stability of unsaturated soil embankment under rainfall infiltration is discussed. The main works are as follows: (1) the mechanical properties of unsaturated soil are systematically discussed. Including the phase composition of unsaturated soil, effective stress, matrix suction, stress state variables, strength theory and deformation theory of unsaturated soil, The relationship between matrix suction and shear strength and the strain caused by the change of matrix suction. (2) the seepage field of embankment under rainfall infiltration is numerically simulated. Through the establishment of embankment model and the simulation of soil seepage field after rainfall, the influence of seepage field on rainfall intensity, duration and type is analyzed in this paper. The influence of seepage field of highway roadbed on the change of seepage coefficient and other factors is also studied. (3) the change of soil displacement under rainfall condition. By means of numerical method, the distribution and development of the displacement of embankment under rainfall seepage are simulated. (4) the influence of rainfall infiltration on the stability of embankment is considered. In the analysis, the finite element strength reduction method is extended to unsaturated soil, and the safety coefficient of subgrade is obtained. (5) the influence of various rainfall factors on subgrade and slope is analyzed. The seepage law of embankment after rainfall and the analysis results of slope stability are summarized and summarized in order to guide the engineering practice.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U416.1

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