Table 3: Equivalent stress peak of beam with different porosity of grouting material under loads/MPa.

Load Type	Equivalent stress peaks for different densities
	1/3 grouting material	2/3 grouting material	without grouting material		full grouting material
Concentrate load	20.549	19.885	21.892	19.447
Symmetrical load	19.306	18.614	20.649	18.145
Uniform load	20.385	19.672	21.808	19.205