软煤拉伸应力-应变关系的实验研究

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．

EXPERIMENTAL STUDIES ON TENSILE STRESS STRAIN RELATION OF SOFT COAL

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 ...