钙质砂与钢板接触面力学特性试验研究

对一种人工制备的钙质砂与光滑铜板接触面进行了一系列的单调和循环剪切试验,表明钙质砂与光滑钢板的接触属于摩擦接触,界面剪应力与正应力之比与剪切位移关系有较好的归一性。等正应力试验中钙质砂的的缩性较大;等体积试验中接触面的抗剪强度因正应力的降低而远低于等正应力试验;循环剪切中加荷与卸荷曲线基本重合,经历循环剪切作用后接触面的抗剪强度有降低的趋势。界面湿摩擦系数低于干摩擦系数。

Experimental study on mechanical behavior of calcareous sand-steel interfaces

A series of artifical calcareous sand - steel interface direct shear tests was performed. It shows that the contact relationship of the interfaces is frictional; and the curves of shear - normal stresses ratio vs shear deformation under different normal stresses are almost identical. Negative dilatancy of the sand under constant normal stresses is quite large. Shear strength under constant volumetric shear test is far below that under constant normal stress condition. Load and unload curves are almost superposition. There is a trend of shear strength debasement after cyclic shearing. And the wet friction coefficient of the interface is less than the dried one.