单轴压缩强度是岩石工程建设中广泛使用的力学参数，直接确定单轴压缩强度相对耗时且较为麻烦。点荷载试验可以间接估算岩石的单轴压缩强度（UCS），试验方式简洁。通过收集到的岩浆岩点荷载试验成果，分析结果表明，（1）大部分转换公式在点荷载强度指数较大时得到偏高的单轴压缩强度值，特别是对部分幂函数；（2）ISRM（American Society for Testing and Materials）建议的取值范围仍然高估了岩石的单轴压缩强度值。为更准确地估算岩石的单轴压缩强度，建议采用点荷载强度指数 的二次函数（见式（1））估算岩石的单轴压缩强度，适用范围为0.0 MPa < <15.0 MPa。

The uniaxial compressive strength(UCS) of rocks is the crucial parameter in the design stage of rock engineering. Direct determination of the parameter is expensive, time-consuming and troublesome. The most widely used indirect determination method to predict the UCS is the point load test. Based on detailed analysis of the available experimental data of igneous rock published on the international journal, the shortcomings of the existed empirical equations are as follows: (1) Most of the equations overestimate the UCS with increasing point load strength index , especially for the power function. (2) The lower limit boundary suggested by ISRM (American Society for testing and Materials) still overestimates the UCS. To assess the UCS of rock in a between way, a new empirical parabolic equation eq. (1) is suggested and the application scope is 0.0 MPa < <15.0 MPa.