基于点荷载试验的岩石抗压强度特性研究

Study on compressive strength characteristics of rock based on point load test

点荷载试验是一种比较简易的测定岩石抗压强度的方法,自国际岩石力学协会建议采用以来,得到了广泛的利用。为了探究点荷载试验确定抗压强度的相关性,以某大型矿山竖井工程白云岩为研究对象,开展了大量点荷载与单轴抗压强度试验,利用正态分布对试验结果的准确性进行检验,并探讨了试件尺寸对点荷载强度标准值的影响。最后将得到的点荷载强度标准值与单轴抗压强度值进行线性拟合分析,这种拟合关系表明两者之间高度正相关。也就是说可以相互换算,换算得到的抗压强度值可以为该矿山以后的设计参数提供依据。

The point load test is a relatively simple method for measuring the compressive strength of rock,which has been widely used since it is recommended by the International Association of Rock Mechanics.In order to explore the correlation between the compressive strength determined by point load test,a large number of point load and uniaxial compressive strength tests were carried out with dolomite in a large mine shaft project as the research object.The accuracy of the test results was tested by normal distribution,and the influence of specimen size on the standard value of point load strength was discussed.Finally,the standard value of point load strength and uniaxial compressive strength were analyzed by linear fitting,which shows that there is a high positive correlation between them.That is to say,the compressive strength value can be converted to each other,which can provide the basis for the design parameters of the mine.