Study on damage similarity of tunnel target material under explosion shock wave

DOI:	10.11809/bqzbgcxb2023.11.013
Keywords:	impact dynamics; tunnel target; shock wave; law of similarity; material equivalent; numerical simulation
Abstract:	The tunnel target is mainly provided by rock. The natural rock mass material is crisscrossed, which is difficult to meet the requirements of damage test. It is necessary to study the damage similarity of tunnel target material. According to the estimation formula of the maximum displacement of the target plate, based on the target characteristics and damage effect, the equivalent study of the material of the granite tunnel target is carried out. C50 concrete and C35 concrete are selected as the equivalent target materials. The relationship between the thickness size equivalent coefficient of the tunnel target material and the ratio of the damage deflection value under the explosion shock wave is deduced. According to the existing estimation formula, the thickness size equivalent coefficient of the prototype and the equivalent target is the ratio of the square root of the yield strength of the two materials. The error between the thickness size equivalent coefficients of C50 concrete and C35 concrete with granite obtained in the study and the theoretical result of the existing estimation formula is -0.45% and -5.13%, respectively, which meet the allowable error requirements, and provides a reference for the equivalent design of tunnel target materials.
Issue:	Vol. 44 No. 11 (2023)
Published:	2023-11-28
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