When carrying out compressive tests on rock specimens, a stress plateau is typically attained following peak strength within a strain range a few times larger than the strain at peak strength. This stress level is commonly known as residual strength. A large database of these tests on granitic rock specimens has been compiled and analyzed in detail with the aim of improving understanding of the residual strength of this type of rock. It is observed that physical scale does not significantly change this residual strength. This stress threshold is also shown to be independent of the initial level of jointing in the rock volume. The implication of these findings is that residual strength derived from rock specimen testing can be potentially extended to rock mass scale, at least for granitic rocks. Three one-parameter residual strength models have been used to fit laboratory test residual strength data of granitic rocks, and all of them are shown to reasonably approximate the actual data. Additionally, the residual laboratory strength parameters of all the varied studied granitic rocks for varying scale and pre-jointing tend not to be very different, covering a limited range of values. Ultimately, the potential errors in simple excavation analysis that might result from a priori assumptions regarding the residual strength of granitic rock masses are quantified.

在对岩石试样进行压缩试验时，通常在峰值强度之后达到峰值强度应变范围内的应力平台，该应变范围是峰值强度应变的几倍。这种应力水平通常称为残余强度。已编译并详细分析了对这些花岗岩试样进行的这些测试的大型数据库，目的是提高对此类岩石残余强度的了解。据观察，物理尺度不会显着改变这种残余强度。该应力阈值也被证明与岩石体积中的初始节理水平无关。这些发现的含义是，从岩石标本测试得出的残余强度可以潜在地扩展到岩体尺度，至少对于花岗岩。三种单参数残余强度模型用于拟合花岗岩的室内试验残余强度数据，均能合理地逼近实际数据。此外，所有不同规模和预连接的不同研究花岗岩的残余实验室强度参数往往不会有很大差异，涵盖的值范围有限。最终，量化了简单开挖分析中的潜在误差，这些误差可能由关于花岗岩岩体剩余强度的先验假设引起。不同规模和预连接的所有不同研究花岗岩的残余实验室强度参数往往不会有很大差异，涵盖的值范围有限。最终，量化了简单开挖分析中的潜在误差，这些误差可能由关于花岗岩岩体剩余强度的先验假设引起。不同规模和预连接的所有不同研究花岗岩的残余实验室强度参数往往不会有很大差异，涵盖的值范围有限。最终，量化了简单开挖分析中的潜在误差，这些误差可能由关于花岗岩岩体剩余强度的先验假设引起。