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为了研究高寒高海拔多年冻土区拓宽路基面层吸热对下伏多年冻土温度与沉降的影响,建立了基于热力耦合理论的差异沉降计算的有限元模型,并利用实体工程监测数据对模型进行了修正,分析了不同季节、不同填高与阴阳坡工况下拓宽侧路基差异沉降分布规律,确定了多年冻土区最优路基拓宽位置。研究结果表明:多年冻土区拓宽路基最大融深与沉降均出现在秋季,10月份的变形最不利,病害特征最突出,其中4m填高路基第10年最大差异沉降为16.9cm,分别为7、1、4月份沉降的1.1、1.4、1.7倍;差异沉降与路基填高存在正相关性,当路基填高分别为2、4、6 m时,10年内路基的差异沉降分别为13.2、16.9、18.1cm;阴坡侧拓宽路基的温度与沉降变化小于阳坡侧,在10年内,阳坡侧拓宽路基底面最大升温为1.3℃,阴坡侧为0.6℃,阳坡侧拓宽路基最大差异沉降为16.9cm,阴坡侧为12.3cm;即使阴坡侧拓宽,差异沉降仍使拓宽路基顶面形成一个斜率为2%~3%的斜坡,进而使路面产生较大附加应力,最终造成结构层病害。
In order to study the effect of widening embankment endotherms on the permafrost temperature and subsidence in permafrost regions at high altitude and high altitude, a finite element model of differential settlement calculation based on thermodynamic coupling theory was established. By using the data of physical engineering monitoring, Were amended to analyze the distribution law of widening differential subsidence of roadbed under different seasons, different filling and the condition of yin-yang slope, and to determine the broadening position of the optimal subgrade in permafrost region. The results show that the maximum thawing depth and settlement of the widened embankment in permafrost regions all appear in the autumn, and the deformation is the most unfavorable in October with the most prominent disease characteristics. The maximum differential settlement of the 4m subgrade in the 10th year is 16.9cm, which is 7 , 1.1, 1.4 and 1.7 times that of January and April respectively. There is a positive correlation between differential settlement and subgrade filling. When subgrade filling is 2, 4 and 6 m respectively, the subsidence of subgrade over 10 years is 13.2 and 16.9 , And 18.1 cm respectively. The temperature and subsidence of the widened embankment on the shady side are less than that on the sunny side. Within 10 years, the maximum temperature rise at the bottom of the embankment is 1.3 ℃ and the shady side is 0.6 ℃. Is 16.9cm and the shady side is 12.3cm. Even if the shady side is widened, the differential settlement will widen the top of the subgrade to form a slope of 2% ~ 3%, which will cause additional additional stress on the pavement and finally cause the structural layer Diseases.