Investigation of the influence of contact friction forces in tests on the strength of compressing wall materialsNataliya Lukinova, Audrey Matrosov, Irina Serebryanaya, Yuliya Terekhina and Dariya NizhnikMATEC Web Conf., 132 (2017) 03002DOI: https://doi.org/10.1051/matecconf/201713203002