Various methods have been proposed to indirectly assess the uniaxial compressive strength (UCS) of intact rock when drilled cores are not available. Indentation test (IT) and point load test (PLT) are the two widely used methods in the field to assess the rock strength by penetrating the irregular blocky fragments. The TBM muck produced by excavation contains a great number of blocky fragments which are suitable for an IT or a PLT. To use the IT or PLT on blocky fragments to estimate rock strength, it is necessary to find the relation between the indentation indices/modified point load strength ($I_{s\left(50\right)}$) and the UCS. In the present study, the uniaxial compressive test (UCT), IT and PLT were conducted on the blocky fragments collected from a TBM-excavated tunnel to find the relationships between them. The effects of fragment sizes and indenter diameter (ID) on the indentation indices (critical transition force CTF and indentation modulus IM) were studied. The investigation shows that the indentation indices are influenced by the cross-sectional area and fracture surface area. Higher CTF and IM can be obtained as the ID increases. The corresponding normalizing methods were developed to reduce the dependency of test results to the fragment sizes and ID. Strong relations were found between the modified point load strength/estimated UCS and the indentation indices using linear and nonlinear regressions.

当没有可用的岩心时，已经提出了各种方法来间接评估完整岩石的单轴抗压强度（UCS）。压痕测试（IT）和点载荷测试（PLT）是本领域中广泛使用的两种方法，可通过穿透不规则的块状碎片来评估岩石强度。通过挖掘生产的TBM渣土含有大量适合IT或PLT的块状碎片。要对块状碎片使用IT或PLT来估算岩石强度，必须找到压痕指数/修正点荷载强度之间的关系（${\mathrm{一世}}_{s（50）}$）和UCS。在本研究中，对从TBM开挖隧道收集的块状碎片进行了单轴压缩试验（UCT），IT和PLT，以查找它们之间的关系。研究了碎片尺寸和压头直径（ID）对压痕指数（临界转变力CTF和压痕模量IM）的影响。研究表明，压痕指数受横截面积和断裂表面积的影响。随着ID的增加，可以获得更高的CTF和IM。开发了相应的标准化方法以减少测试结果对片段大小和ID的依赖性。使用线性和非线性回归发现修正点载荷强度/估计的UCS与压痕指数之间存在很强的关系。