【摘要】：高填方路堤常出現(xiàn)于我國山嶺重丘區(qū)的公路建設中,路堤在投入運營后常出現(xiàn)沉降變形大、路堤失穩(wěn)等工程病害,嚴重影響公路的建設效益和通行效率。本文基于工程實際資料,綜合采用室內試驗、數(shù)值模擬、理論分析的研究方法,從填料參數(shù)時效性試驗、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參數(shù)時效性試驗研究。以G320國道蘆溪境內K1045+230路段高填方路堤填料為試驗對象進行室內試驗,對比測定初始狀態(tài)與不同周期下物理力學參數(shù)的變化情況,得出填料的變形指標和抗剪強度指標隨時間推移,均呈非線性增長趨勢;路堤填料的含水率和孔隙比與時間呈非線性負相關性,抗剪強度參數(shù)隨時間的推移逐漸增大,粘聚力對時效性的影響作用較內摩擦角更為敏感的結論。(2)路堤填料參數(shù)時效變化對高填方路堤變形規(guī)律影響分析。根據(jù)室內試驗測定的數(shù)據(jù),進行有限元模擬分析,得到填料參數(shù)時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)側向位移最大值。(3)填料各物理力學參數(shù)時效變化對變形效果的特殊性分析�；谟邢拊M分析,對填料物理力學參數(shù)進行單因素分析,發(fā)現(xiàn)在填料壓密變形過程中變形模量時效變化對豎向變形影響效果顯著;填料抗剪強度(粘聚力和內摩擦角)的時效變化會對路堤的側向變形影響明顯。填料的含水率對路堤變形有雙重影響效果,在施工過程中,應控制含水率對路堤變形的影響。(4)路堤填料參數(shù)時效變化對高填方路堤穩(wěn)定性影響分析。結合室內試驗的數(shù)據(jù),對高填方路堤穩(wěn)定性進行分析研究,得到路堤的安全系數(shù)隨時間變化呈非線性增長的結論。填料含水率時效變化對路堤安全系數(shù)的提高效果最為顯著;粘聚力和內摩擦角對改善路堤臨界滑動面形狀和位置有顯著效果;變形模量時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.
【學位授予單位】：南昌航空大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U416.12

【參考文獻】

相關期刊論文 前5條

1 付宏淵;王意明;劉新喜;;炭質頁巖路堤變形特性研究[J];中外公路;2012年01期

2 王國利;陳生水;徐光明;;干濕循環(huán)下膨脹土邊坡穩(wěn)定性的離心模型試驗[J];水利水運工程學報;2005年04期

3 孟慶山;孔令偉;郭愛國;胡明鑒;劉觀仕;;高速公路高填方路堤拼接離心模型試驗研究[J];巖石力學與工程學報;2007年03期

4 劉俊新;謝強;曹新文;胡啟軍;;紅層填料路堤變形研究[J];巖石力學與工程學報;2007年S1期

5 談云志;孔令偉;郭愛國;馮欣;萬智;;紅黏土路基填筑壓實度控制指標探討[J];巖土力學;2010年03期

，

本文編號：2123921