结构异形面平动在砂土中产生的土压力作用模式

Earth Pressure Model of Structure Irregular Surfaces in Translational Motion in Sand

为探究结构异形面对土‒结构相互作用的影响,通过室内模型试验,研究了不同形状结构面在平动模式下与砂土的相互作用规律,考虑外凸形、平板形和内凹形3种典型结构面,测量了结构水平移动时表面不同位置的接触应力和土体位移场变化情况。试验结果表明,结构形状对土压力最大值、土压力分布以及土体地表影响范围有显著影响。在相同的相对位移下,外凸形的土压力最大值最大,平板形次之,内凹形最小;土压力分布方面,外凸形和内凹形结构的土压力分布为梯形与“斜椭圆”叠加,平板形土压力分布为梯形与正弦函数叠加;外凸形的地表影响宽度最大,平板形次之,内凹形最小。

To explore the influence of structure shape surface on soil-structure interaction,a series of laboratory model tests are conducted and the interaction between irregular structure surfaces and sand in the translational model is studied.The irregular structure surfaces include three typical structure surfaces,i.e.,convex structure,plate structure,and concave structure.The contact pressure and soil displacement field in translation of structure are measured.The test results show that the structure shape has a noticeable influence on the maximum soil pressure,soil pressure distribution,and affected region of soil displacement.With the same relative displacement,the maximum soil pressure of the convex structure is the largest,followed by the plate structure and the concave structure.The soil pressure distributions of the convex structure and concave structure are the superposition of trapezoid and“oblique ellipse”,and the soil pressure distribution of plate structure is the superposition of trapezoid and sine function.The influence width of the earth surface of the convex structure is the largest,followed by the plate structure and the concave structure.