几种岩石点荷载强度与单轴抗压强度之间的关系研究

Study on the Relationship Between Point Load Strength and Uniaxial Compressive Strength of Several Rocks

为了研究某矿区层纹灰岩、结晶灰岩、千枚岩和砂岩点荷载强度和单轴抗压强度的关系,在大量点荷载试验和单轴抗压强度试验的基础上,通过相差系数分析了点荷载试验得到的抗压强度与室内单轴抗压强度的接近性,同时分析了各岩性的点荷载转化系数。结果表明:4种岩石的点荷载试验强度与单轴抗压强度之间的转换系数不同,并且差异较大,除了砂岩点荷载强度转化系数接近经验值22,其他3类岩石的点荷载强度转化系数均小于经验值,这与结构面分布情况和点荷载加载方向有关。

In order to study the relationship between point load strength and uniaxial compressive strength of laminated limestone,crystalline limestone,phyllite and sandstone in a mining area,based on a large number of point load tests and uniaxial compressive strength,the similarity between point load test and indoor uniaxial compressive strength is analyzed by difference coefficient,and the point load conversion coefficient of each lithology is analyzed.The results show that the conversion coefficient between point load test strength and uniaxial compressive strength of four kinds of rocks are different,and the difference is large.Except that the conversion coefficient of point load strength of sandstone is close to the empirical value of 22,the conversion coefficient of point load strength of other three kinds of rocks is less than the empirical value,which is related to the distribution of structural planes and the direction of point load.