【摘要】：高填方路堤常出現(xiàn)于我國山嶺重丘區(qū)的公路建設(shè)中,路堤在投入運(yùn)營后常出現(xiàn)沉降變形大、路堤失穩(wěn)等工程病害,嚴(yán)重影響公路的建設(shè)效益和通行效率。本文基于工程實(shí)際資料,綜合采用室內(nèi)試驗(yàn)、數(shù)值模擬、理論分析的研究方法,從填料參數(shù)時(shí)效性試驗(yàn)、路堤變形演化規(guī)律、路堤穩(wěn)定狀態(tài)變化等方面開展研究,取得了如下幾方面的研究成果:(1)高填方路堤填料物理力學(xué)參數(shù)時(shí)效性試驗(yàn)研究。以G320國道蘆溪境內(nèi)K1045+230路段高填方路堤填料為試驗(yàn)對象進(jìn)行室內(nèi)試驗(yàn),對比測定初始狀態(tài)與不同周期下物理力學(xué)參數(shù)的變化情況,得出填料的變形指標(biāo)和抗剪強(qiáng)度指標(biāo)隨時(shí)間推移,均呈非線性增長趨勢;路堤填料的含水率和孔隙比與時(shí)間呈非線性負(fù)相關(guān)性,抗剪強(qiáng)度參數(shù)隨時(shí)間的推移逐漸增大,粘聚力對時(shí)效性的影響作用較內(nèi)摩擦角更為敏感的結(jié)論。(2)路堤填料參數(shù)時(shí)效變化對高填方路堤變形規(guī)律影響分析。根據(jù)室內(nèi)試驗(yàn)測定的數(shù)據(jù),進(jìn)行有限元模擬分析,得到填料參數(shù)時(shí)效變化影響下路堤的規(guī)律:豎向變形等值線沿路堤橫斷面呈“盆形”;靠近路堤下部1/4~1/3高度處出現(xiàn)側(cè)向位移最大值。(3)填料各物理力學(xué)參數(shù)時(shí)效變化對變形效果的特殊性分析�；谟邢拊M分析,對填料物理力學(xué)參數(shù)進(jìn)行單因素分析,發(fā)現(xiàn)在填料壓密變形過程中變形模量時(shí)效變化對豎向變形影響效果顯著;填料抗剪強(qiáng)度(粘聚力和內(nèi)摩擦角)的時(shí)效變化會(huì)對路堤的側(cè)向變形影響明顯。填料的含水率對路堤變形有雙重影響效果,在施工過程中,應(yīng)控制含水率對路堤變形的影響。(4)路堤填料參數(shù)時(shí)效變化對高填方路堤穩(wěn)定性影響分析。結(jié)合室內(nèi)試驗(yàn)的數(shù)據(jù),對高填方路堤穩(wěn)定性進(jìn)行分析研究,得到路堤的安全系數(shù)隨時(shí)間變化呈非線性增長的結(jié)論。填料含水率時(shí)效變化對路堤安全系數(shù)的提高效果最為顯著;粘聚力和內(nèi)摩擦角對改善路堤臨界滑動(dòng)面形狀和位置有顯著效果;變形模量時(shí)效變化對提高路堤穩(wěn)定性的作用效果不明顯。
[Abstract]:The high fill embankment often appears in the highway construction in the mountainous and heavy hill area of our country. After the embankment is put into operation, there are many engineering diseases, such as large settlement deformation and unstable embankment, which seriously affect the efficiency of the highway construction and the traffic efficiency. Based on the actual engineering data, the research methods of indoor test, numerical simulation and theoretical analysis are adopted in this paper. The research is carried out from the aspects of filling parameter time-efficiency test, embankment deformation evolution law, embankment stability change and so on. The research results are as follows: (1) Experimental study on the physical and mechanical parameters of high fill embankment. Taking the filling material of high fill embankment in Luxi section of G320 National Highway as the experimental object, the change of physical and mechanical parameters in initial state and in different periods was compared and measured. It is concluded that the deformation index and shear strength index of embankment show a nonlinear increasing trend with time, the moisture content and void ratio of embankment filler show nonlinear negative correlation with time, and the shear strength parameter increases gradually with time. The conclusion that the cohesive force is more sensitive to the aging effect than the internal friction angle. (2) the influence of the age change of embankment filling parameters on the deformation of high fill embankment is analyzed. According to the data of laboratory test and finite element simulation analysis, the rule of embankment under the influence of age change of filling parameters is obtained: vertical deformation isoline is "basin shape" along the cross-section of embankment; Near the bottom of the embankment, there is a maximum lateral displacement at 1 / 4 / 3 height. (3) the particularity of the deformation effect caused by the aging variation of the physical and mechanical parameters of the fillers. Based on the finite element simulation analysis, the physical and mechanical parameters of fillers are analyzed by single factor analysis. It is found that the aging effect of deformation modulus on vertical deformation is significant during the compaction deformation of fillers. The effect of aging on lateral deformation of embankment is obvious due to the shear strength (cohesion and angle of internal friction). The influence of moisture content of filling on the deformation of embankment should be controlled in the construction process. (4) the influence of aging variation of filling parameters on the stability of embankment with high embankment should be controlled. Combined with indoor test data, the stability of high fill embankment is analyzed and studied, and the conclusion that the safety coefficient of embankment increases nonlinear with time is obtained. The effect of aging on the safety coefficient of embankment is most obvious, the cohesion and the angle of internal friction have remarkable effect on improving the shape and position of critical sliding surface of embankment. The effect of aging variation of deformation modulus on the stability of embankment is not obvious.
【學(xué)位授予單位】：南昌航空大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U416.12

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