固体材料应力-应变曲线趋势规律的普适性

摘要

本文通过砂岩及灰岩样本在单轴荷载下的试验发现,尽管其强度峰值及弹性模量值不同,但应力-应变曲线却极为相似.进一步的人工固体材料样本(包括石膏、混凝土、料礓石胶结石英材料等)的单轴抗压试验结果仍然给出了惊人相似的应力-应变曲线.这些曲线的综合概括形态是由三段相曲线顺序连接构成的S型曲线.中间依次出现两处相转化拐点.它表明各类固体材料在单轴荷载下应力-应变过程直至破坏的趋势性规律具有普适性.因此对各类地质工程的变形破坏过程的评价和预测有重要的参考价值.%Sandstone and limestone specimens were carried out on uniaxial compression tests,and the similarities among stress-strain curves were remarkable except peak strength and elastic modulus.Further tests on artificial solid materials,including gypsum,concrete and ginger nut cemented with quartz sands,showed striking similarity and tendency in stress-strain curves.General summery of those sigmoid curves contained three curves and connected by two inflection points.The results indicated strong universal regularity for solid material under uniaxial compression test.This regularity has significant guidance to evaluation and prediction of deformation and failure process on geological engineering.