基于纳米压痕的煤系泥岩细观力学及断裂性能试验研究

doi:10.11799/ce202302023

Abstract

Abstract: Taking the mudstone obtained from Kouzidong coal mine, Fuyang, Anhui, as the research object, nanoindentation test was carried out on this mudstone. Based on the elastic theory and energy principle, the meso-mechanical properties and fracture characteristic were investigated. Furthermore, difference in meso-mechanical properties of main composition of mudstone was analyzed. Results showed that under the same maximum load, the indentation depth on the mudstone surface varied different. The elastic modulus was in the range of 2-114 GPa, and the hardness ranged from 0 GPa to 16 GPa, reflecting the heterogeneity of the mudstone. Based on the probability density distribution of modulus, three different main phases were identified, including clay minerals (~ 7.83 GPa, including kaolinite and illite), chlorite (~ 41.67 GPa) and quartz (~ 97.29 GPa). Morever, the fracture toughness of clay minerals, chlorite and quartz was 0.09, 0.91 and 1.95 MPa·m1/2, respectively. The fracture toughness of clay minerals accounted for the largest proportion (~ 70.0 %), and the clay minerals played a significant effect in macro-fracture properties. By the obtained mesoscopic mechanical properties and fracture toughness of different phases of mudstone, it was useful to understand the macroscopic failure behaviour of mudstone.

CLC Number:

TD315

References

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Experimental study on meso-mechanical and fracture characteristics of coal measures mudstone using nanoindentation

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