摘要
提供一种用于测量软煤或土的抗拉强度、拉伸应力应变关系等拉伸特性的实验装置．利用模具压制出均匀的煤环试件，对煤环内壁施加均布径向水压力使其拉伸变形和破坏．根据实验结果，提出了弹脆性拉断破坏的理论模型，并据此对煤的抗拉强度、弹性常数以及等效孔隙压力系数等进行了分析和讨论．实验数据稳定可靠，散布小，重复性好，说明所提供的实验装置和实验方法简单而有效．
A test set up for measuring tensile stress strain relation and tensile strength of soft coal or soil is proposed A ring shaped coal sample pressed from coal powder is lined with a pressurized water bag When the water pressure increases to a certain value, the coal sample in circumferential tension breaks down Systematic experiments have been done to show the tensile stress strain relation of the pressed coal sample with various sample density and pore pressure The stress strain relation is linear elastic until brittle fracture takes place The variation of the modified factor, the ratio of bulk moduli for modifying Terzaghi′s expression for the effective stress, with porosity is also examined and analysed The experimental data are reproducible and reliable, so that the proposed set-up is practicable
出处
《力学学报》
EI
CSCD
北大核心
1997年第5期582-589,共8页
Chinese Journal of Theoretical and Applied Mechanics
基金
国家自然科学基金委重点基金
关键词
弹脆性材料
抗拉强度
拉伸
应力-应变
软煤
ring shaped coal sample, elastic brittle material, tensile strength, tensile stress strain relation, ratio of bulk moduli
