压实方式影响路基湿度场演变规律数值试验研究

发布时间：2018-10-20 12:13

【摘要】：为研究路基湿度场受压实方式影响所产生的变化与分布问题,分别构建4种具备不同压实方式的路基数值试验模型,通过分析二维入渗方式的降雨试验结果,总结不同压实方式影响下路基湿度场扰动区的分布特征,以及扰动区扩距、路基湿度与梯度变化的主要规律,并阐述其根本机理。研究结果表明:降雨入渗路基产生湿度扰动区可划分为前、后2个区域,后区表现为湿度较大、梯度较小,前区表现则与后区相反;湿度扰动区扩距和湿度都随着路基压实度的增加而呈线性减小,前扰动区的湿度梯度随着路基压实度呈线性递增;雨水入渗路基速度矢量的竖向分量远大于水平向分量,受到路基压实区组合方式影响,非饱和扰动区的下层路基湿度随上层路基压实度增加呈线性显著降低。
[Abstract]:In order to study the change and distribution of embankment moisture field affected by compaction mode, four numerical test models of roadbed with different compaction modes were constructed, and the results of rainfall test of 2-D infiltration mode were analyzed. This paper summarizes the distribution characteristics of disturbance zone of subgrade humidity field under the influence of different compaction modes, as well as the main rules of variation of disturbance zone, subgrade humidity and gradient, and expounds its fundamental mechanism. The results show that the disturbance region of moisture produced by rainfall infiltration subgrade can be divided into two regions, the latter one is higher humidity, the gradient is smaller, and the former area is opposite to the latter. With the increase of compaction degree of roadbed, the humidity gradient of predisturbed zone increases linearly with the compaction degree of roadbed, the vertical component of speed vector of Rain Water infiltration roadbed is much larger than that of horizontal component, Affected by the combination of roadbed compaction, the humidity of the subgrade in the unsaturated disturbed area decreases linearly with the increase of the compaction degree of the upper roadbed.
【作者单位】：中国矿业大学深部岩土力学与地下工程国家重点实验室力学与建筑工程学院;
【基金】：国家自然科学青年基金资助项目(51108452)
【分类号】：U416.1

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