试验方法对岩石抗拉强度测定的影响

采用弧压劈裂、角压劈裂及直接拉伸３种试验方法，对煤、砂岩、泥岩、大理岩进行了大量的抗拉强度测试．结果表明：同一种岩样，３种不同方法测定的抗拉强度相差很大，但具有弧压和角压劈裂法测定的岩石抗拉强度平均值与直接拉伸法测定的抗拉强度相近的规律．通过对弧压和角压劈裂试验试件内应变场分布规律的测定，分析了产生上述现象的原因，并提出了关于岩石抗拉强度测定的几点建议

Influence of Test Methods on Measured Results of Rock Tensile Strength

Three different methods, i.e. arc and angleholder and direct tension tests, are used to determine the tensile strength of coal, sandstone, mudstone, and marble ect. The test results show that there is a great difference of tensile strength for the same rock using different test methods, but difference between the average tensile strength for the two indirect test methods and that for the direct tension method is little. By the measurement of strain distribution on rock samples for the two indirect methods, the cause of the above phenomenon occurring is analyzed. Finally, some useful suggestions of determining rock tensile strength are given.