Rock Fragmentation Characteristics by TBM Cutting and Efficiency under Bi-Lateral Confinement

Published on Mar 26, 2018in Applied Sciences
· DOI :10.3390/APP8040498
Yulong Chen1
Estimated H-index: 1
,
Chenpeng Song1
Estimated H-index: 1
Sources
Abstract
In this study, the mechanisms of rock breakage are assessed using tunnel boring machine (TBM) disc cutters under bi-axial pressure. Sequential indentation tests were conducted on granite specimens using a tri-axial testing platform. The morphology and volume of the fractured surface were measured and analyzed using a three-dimensional surface profilometer. An analysis of rock breaking growth and efficiency was performed as well. When the minor confining pressure (σ1) is constant, the results show that a larger difference in confining pressure leads to a larger volume of fractured surface, thereafter improving the rock-breaking efficiency even though the penetration energy is enlarged. On the other hand, when the major confining pressure (σ2) is constant, the penetration energy increases proportionally with the σ1; however, the volume of fractured surface is decreased, and the breaking efficiency is attenuated as well.
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