长江科学院院报2018，Vol.35Issue(3)：34-44,11.DOI:10.11988/ckyyb.20171091
基于尺寸效应的类岩石材料点荷载指标与单轴抗压强度对应关系研究
Correlation Between Point Loading Index and Uniaxial Compressive Strength of Rock-like Material Based on Size Effect
摘要
Abstract
The point load intensity index is considered as the optimum method for measuring and estimating uniaxial compressive strength as it is of unique advantage by indirectly determining the uniaxial compressive strength of rock. By summing up a large number of literatures in China and abroad,we found that current research results are limited by the anisotropy of rock materials,fuzzy correspondence of data,heavy equipment and lack of experimental verifi-cation. In this paper,we researched the correlation between point load index and uniaxial compressive strength of rock-like isotropic material of different sizes and strengths by using a portable instrument for point load test.Accord-ing to test results we conclude that the test data follows the normal distribution law with obvious central tendency;size effect of rock-like material on point load index is apparent;according to P-D2ecurve,the highest correlation co-efficient is 0.97,indicating that the point load index of irregular samples can be rectified to that of standard equiva-lent size. Furthermore,the relational expression between point load index and uniaxial compression strength is es-tablished, with a correlation coefficient up to 0.994, which suggest that the rectified point load index well reflects the correlation and improves calculation accuracy. Finally,through point load test of irregular specimens,the error of the proposed relational expression is verified within 15%.关键词
类岩石材料/点荷载指标/单轴抗压强度/尺寸效应/统计方法Key words
point loading index/uniaxial compressive strength/rock-like material/size effect/statistical method分类
建筑与水利引用本文复制引用
林军,沙鹏,伍法权,常金源..基于尺寸效应的类岩石材料点荷载指标与单轴抗压强度对应关系研究[J].长江科学院院报,2018,35(3):34-44,11.基金项目
中央高校基础科研业务费专项(310821171125) （310821171125）
