砂砾岩点荷载强度与单轴抗压强度关系

The Relationship Between Point Load Strength and Uniaxial Compressive Strength of Glutenite

针对九江地区砂砾岩呈现岩芯破碎,多呈碎块状,少量呈短柱状、块状等问题,造成现阶段岩样品不具有代表性,制样极其困难。因此,分析并试验九江地区砂砾岩具有重要的意义。点荷载试验是一种快速确定岩石单轴抗压强度的方法,在工程现场得到了广泛的研究及应用。然而,点荷载强度指标和单轴抗压强度之间的变换关系式存在较大的不确定性。本文以九江地区砂砾岩点荷载测定数据为基础,分析了不规则点荷载强度指标Is和点荷载强度标准值Is(50)之间的变化情况,得到了4组点荷载强度标准值Is(50),并对不同的点荷载强度标准值与砂砾岩单轴抗压强度进行线性拟合与非线性拟合。最后确定了九江地区砂砾岩单轴抗压强度和点荷载强度标准值之间的最佳关系。

The glutenite core is broken,mostly in the shape of fragments,and a small amount is in the shape of short columns and blocks in Jiujiang.As a result,the rock samples are not representative and the sample preparation is extremely difficult at this stage.Therefore,the analysis and test of glutenite in Jiujiang area is of great significance.Point load test is a method to quickly determine the uniaxial compressive strength of rock,and it has been widely studied and applied in engineering sites.However,the transformation relationship between the point load strength index and the uniaxial compressive strength has greater uncertainty.Based on the point load measurement data of glutenite in Jiujiang,this paper analyzes the changes between the irregular point load strength index Isand the point load strength standard value Is(50),and obtains the point load strength standard value Is(50)by four sets of methods.Then,the different point load strength standard value and the uniaxial compressive strength of glutenite for linear fitting and nonlinear fitting are discussed in detail.Finally,the most optimal relationship between the uniaxial compressive strength and the point load strength standard value of glutenite in Jiujiang is determined.