Investigation of mechanical properties of bedded shale by nanoindentation tests: A case study on Lower Silurian Longmaxi Formation of Youyang area in southeast Chongqing, China

Xian SHI,Shu JIANG,Shuangfang LU,Zhiliang HE,Dongjie LI,Zhixuan WANG,Dianshi XIAO

Table 2 Mechanical parameters by average method from nanoindentation test.

Coring angle Elastic modulus/GPa Hardness/GPa Fracture toughness/(MPa·m1/2) Minimum Maximum Average Standard deviation Minimum Maximum Average Standard deviation Minimum Maximum Average Standard deviation Parallel bedding 35.61 59.47 45.21 5.59 1.58 3.89 2.43 0.56 2.02 3.41 2.68 0.33 Vertical bedding 37.41 53.80 43.60 4.03 1.79 4.58 2.85 0.78 0 2.94 2.37 0.66