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了解压实红黏土的持水性能是预防路基土体开裂和失稳的基础。首先,利用15 bar压力板仪研究了4种干密度压实试样脱湿路径下的土体持水特征曲线。发现持水曲线随着干密度减小,曲线中间部分呈现水平台阶状,且干密度越小水平台阶的长度越长。然后,结合相同干密度试样的孔隙分布特征曲线,从微观结构的角度分析了压实土体不同持水性能的原因。最后,通过数据拟合的方法建立了不同压实度土体的持水特征曲线方程。
Knowing the water holding capacity of compacted red clay is the basis for preventing cracking and instability of subgrade soils. First, the soil water retention curves of four dry density compacted samples were studied using a 15 bar pressure gauge. It is found that the water retention curve decreases as the dry density decreases, the middle part of the curve presents a horizontal step shape, and the smaller the dry density, the longer the horizontal step length. Then, combined with the pore distribution curve of the same dry density sample, the reason of different water holding capacity of compacted soil was analyzed from the microstructure perspective. Finally, the water retention curve of soil with different compaction degree was established by data fitting method.