现场点荷载试验经验公式分析

The Empirical Correlations between the In-situ Point Load Tests and the Unconfined Compressive Strength of Rock

通过对巴基斯坦Neelum-Jhelum（N-J）水电站第三系Murree组砂质硬岩进行点荷载及单轴抗压强度试验,探讨基于点荷载强度快速推算单轴抗压强度转化系数取值问题。基于试验数据回归分析,给出了适用于N-J砂质硬岩的线性、指数型两种单轴抗压强度推算经验公式及其转化系数,并与先前所提经验公式进行了对比分析。点荷载试验转换后的强度参数可为隧道岩体质量分级提供理论依据。

This paper presents the development of the empirical relationship between the point load test results and the unconfined compressive strength of intact rock samples of hard sandstone sample of Murree Formation of Tertiary Period in Pakistan Neelum-Jhelum（N-J） Hydropower Station Project.Throughout the regression analysis of test results,two different empirical relationships,linear relationship and index relationship,were developed.The point load test results could be used in the prediction of the unconfined compressive strength of intact rock samples.The compressive strength of intact rock can be used in the rock mass quality classification.