發(fā)布時間：2018-09-13 09:25

【摘要】：作為一種新型的巖土工程材料,土工格柵已被廣泛應(yīng)用于各個工程領(lǐng)域。近年來隨著高速公路建設(shè)的迅速發(fā)展,很多高速公路不可避免地建設(shè)在軟土地基上,而格柵加筋作為一種行之有效的軟基加固方法,在各類工程軟基加固中取得了良好的效果,但該法的加固機(jī)理及其影響因素等諸多方面仍存在很多不明之處。本文在前人工作的基礎(chǔ)上,基于大型有限元數(shù)值計算平臺ADINA,建立土工格柵加筋軟土路堤平面應(yīng)變模型,綜合考慮孔隙水的影響,對加筋路堤體系進(jìn)行參數(shù)敏感性分析評價其時效性。在此基礎(chǔ)上利用動力時程逐步時間積分法,對加筋路堤體系進(jìn)行地震動力響應(yīng)分析。具體研究內(nèi)容包括:(1)針對加筋路堤體系進(jìn)行了等效靜力計算,分析了加筋軟土路堤在重力和行車荷載作用下的固結(jié)沉降引起的應(yīng)力重分布及變形;在此基礎(chǔ)上對加筋路堤體系中各種參數(shù)(加筋方式、間距、層數(shù)、模量以及路基土彈性模量、路堤土內(nèi)摩擦角、泊松比和黏聚力)進(jìn)行等效靜力計算,分析不同參數(shù)變化對加筋路堤體系受力及變形的影響規(guī)律,計算結(jié)果表明:加筋方式、間距以及路堤土內(nèi)摩擦角和黏聚力對加筋路堤體系特性影響較大,針對這些參數(shù),通過正交試驗設(shè)計進(jìn)行參數(shù)化分析,獲得這些參數(shù)具體的影響系數(shù),得到結(jié)果為路堤土內(nèi)摩擦角為影響系數(shù)最大的參數(shù),黏聚力次之。(2)選取典型強(qiáng)震記錄El-centro波,分析了不同地震波強(qiáng)度對加筋路堤體系地震動力響應(yīng)的影響,然后通過對比計算有無孔隙水兩種工況,分析孔隙水對體系地震動力響應(yīng)的影響。在此基礎(chǔ)上,對飽和軟土場地上加筋路堤體系進(jìn)行了參數(shù)化分析,進(jìn)一步分析不同參數(shù)對加筋路堤體系地震動力響應(yīng)的影響規(guī)律。
[Abstract]:As a new geotechnical engineering material, geogrid has been widely used in various engineering fields. In recent years, with the rapid development of highway construction, many expressways are inevitably built on soft soil foundation. As an effective method of soft foundation reinforcement, grille reinforcement has achieved good results in all kinds of projects. However, the reinforcement mechanism and influencing factors of the method are still unknown. Based on the previous work, the plane strain model of geogrid reinforced soft soil embankment is established based on the large finite element numerical calculation platform ADINA, and the influence of pore water is considered synthetically. The parameter sensitivity analysis of reinforced embankment system is carried out to evaluate its timeliness. On this basis, the seismic dynamic response of reinforced embankment system is analyzed by using the time integration method of dynamic time history step by step. The specific research contents are as follows: (1) the equivalent static calculation of reinforced embankment system is carried out, and the stress redistribution and deformation caused by consolidation settlement of reinforced soft soil embankment under the action of gravity and driving load are analyzed. On this basis, the equivalent static calculation of various parameters (reinforcement mode, spacing, layer number, modulus and elastic modulus of embankment soil, internal friction angle of embankment soil, Poisson's ratio and cohesive force) in reinforced embankment system is carried out. The effects of different parameters on the stress and deformation of reinforced embankment system are analyzed. The results show that the reinforced embankment system is greatly affected by the reinforcement mode, spacing, internal friction angle and cohesive force of embankment soil, and the characteristics of reinforced embankment system are greatly affected by these parameters. Through the parametric analysis of orthogonal test design, the specific influence coefficients of these parameters are obtained. The results show that the internal friction angle of embankment soil is the most influential parameter, followed by cohesion. (2) the typical strong earthquake record El-centro wave is selected. The influence of different seismic wave intensity on seismic dynamic response of reinforced embankment system is analyzed, and then the influence of pore water on seismic dynamic response of reinforced embankment system is analyzed by comparing with or without pore water. On this basis, the parameterized analysis of reinforced embankment system on saturated soft soil site is carried out, and the influence of different parameters on the seismic dynamic response of reinforced embankment system is further analyzed.
【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】：2017
【分類號】：U416.12

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