砂性土中土拱形态演变试验研究

目前对于土体中的土拱形态假设众多，土拱形态的演变研究不足。本文利用室内模型装置对土拱的形态和演变规律进行了试验研究，试验模型可以形成宏观的土拱，能够直接观测土拱的形成和演变过程。对试验过程中记录的土拱照片进行处理后，通过拟合和统计分析，得出土拱的合理形态曲线方程。试验表明：砂性土中土拱不是恒定不变的，而是处于不断变化的状态；土体中会先形成一组类似的土拱后，再转变为另一组类似的土拱；土拱的形态也不是单一的形态，砂性土中的土拱形态由下而上从抛物线转变为椭圆曲线。

Experimental study on morphological evolution of soil arching in sandy soil

Today, there are many assumptions about soil arching, but the study of the evolution of soil arching is inadequate. Therefore, research the shape and evolution of soil arching by the model device, the model can form macroscopic soil arching, and make a direct observation of soil arching and the process of evolution. To deal with the photos recorded during the experiment by fitting and statistical analysis, can obtain the reasonable shape curve of soil arch. The experiment shows that the soil arching in sandy soil is not fixed. A set of soil arches form in the soil and then change into a different set of soil arches. The shape of soil arching is not single, and the shape of soil arching in sandy soil changes from parabola to elliptic curve.