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无损硬度测试——施密特锤及肖氏硬度实验和点荷载试验是三种经常用来间接测定岩石强度指标的方法。目前很多学者已提出了不同的经验关系，这些关系主要是把硬度指标、点荷载指标和单轴抗压强度、单轴抗拉强度与间接拉伸强度联系起来。但是在应用这些关系时，必须首先用当地的岩石特性数据加以验证，查看地质变化的影响，才可确保使用无误。本文的主要目的是根据大量香港岩石（包括花岗岩、石灰岩、大理岩和凝灰岩）的实验数据，提出一套适用于香港地区岩石的经验关系，另外也对其他经验关系作了考证。
Nondestructive Hardness Testing - Schmidt Hammers and Shore Hardness Experiments and Point Load Tests are three methods that are often used to indirectly measure rock strength. At present, many scholars have put forward different empirical relationships, these relationships mainly hardness, point load and uniaxial compressive strength, uniaxial tensile strength and indirect tensile strength are linked. However, when applying these relationships, you must first validate them with local rock characterization data to see the effects of geological changes before they can be used correctly. The main purpose of this paper is to develop a set of empirical relationships applicable to rocks in Hong Kong based on a large number of experimental data from rocks in Hong Kong (including granite, limestone, marble and tuff) and to verify the other empirical relationships.