高填方路堤变形及稳定性的时间效应分析
发布时间：2018-07-15 11:32
【摘要】：高填方路堤常出现于我国山岭重丘区的公路建设中,路堤在投入运营后常出现沉降变形大、路堤失稳等工程病害,严重影响公路的建设效益和通行效率。本文基于工程实际资料,综合采用室内试验、数值模拟、理论分析的研究方法,从填料参数时效性试验、路堤变形演化规律、路堤稳定状态变化等方面开展研究,取得了如下几方面的研究成果:(1)高填方路堤填料物理力学参数时效性试验研究。以G320国道芦溪境内K1045+230路段高填方路堤填料为试验对象进行室内试验,对比测定初始状态与不同周期下物理力学参数的变化情况,得出填料的变形指标和抗剪强度指标随时间推移,均呈非线性增长趋势;路堤填料的含水率和孔隙比与时间呈非线性负相关性,抗剪强度参数随时间的推移逐渐增大,粘聚力对时效性的影响作用较内摩擦角更为敏感的结论。(2)路堤填料参数时效变化对高填方路堤变形规律影响分析。根据室内试验测定的数据,进行有限元模拟分析,得到填料参数时效变化影响下路堤的规律:竖向变形等值线沿路堤横断面呈“盆形”;靠近路堤下部1/4~1/3高度处出现侧向位移最大值。(3)填料各物理力学参数时效变化对变形效果的特殊性分析。基于有限元模拟分析,对填料物理力学参数进行单因素分析,发现在填料压密变形过程中变形模量时效变化对竖向变形影响效果显著;填料抗剪强度(粘聚力和内摩擦角)的时效变化会对路堤的侧向变形影响明显。填料的含水率对路堤变形有双重影响效果,在施工过程中,应控制含水率对路堤变形的影响。(4)路堤填料参数时效变化对高填方路堤稳定性影响分析。结合室内试验的数据,对高填方路堤稳定性进行分析研究,得到路堤的安全系数随时间变化呈非线性增长的结论。填料含水率时效变化对路堤安全系数的提高效果最为显著;粘聚力和内摩擦角对改善路堤临界滑动面形状和位置有显著效果;变形模量时效变化对提高路堤稳定性的作用效果不明显。
[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.
【学位授予单位】：南昌航空大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.12
本文编号：2123921
[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.
【学位授予单位】：南昌航空大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.12
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