Relation between point load index and uniaxial compressive
strength for igneous rock

ZHANG Jian-ming; TANG Zhi-cheng; LIU Quan-sheng

doi:10.16285/j.rsm.2015.S2.084

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Relation between point load index and uniaxial compressive strength for igneous rock

更新时间：2026-06-25

- Relation between point load index and uniaxial compressive strength for igneous rock
- Vol. 36, Issue S2, Pages: 595-602(2015)
- 作者机构：
  
  武汉大学土木建筑工程学院,湖北,武汉,430072
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2015.S2.084
  CLC： TU452
- Online First：14 June 2018，
  
  Published：2015
- 稿件说明：
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ZHANG Jian-ming, TANG Zhi-cheng, LIU Quan-sheng. Relation between point load index and uniaxial compressive strength for igneous rock[J]. 2015, 36(S2): 595-602.
DOI：

ZHANG Jian-ming, TANG Zhi-cheng, LIU Quan-sheng. Relation between point load index and uniaxial compressive strength for igneous rock[J]. 2015, 36(S2): 595-602. DOI： 10.16285/j.rsm.2015.S2.084.

摘要

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。

Abstract

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.

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