Effect of dynamic loading rate on crack propagation velocity and dynamic fracture toughness in tunnels

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (4) : 129-136.

ZHOU Lei，ZHU Zheming，DONG Yuqing，YING Peng，WANG Lei

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Abstract

In the process of tunnel blasting excavation,blasting activities may induce radial cracks in the surrounding rock of tunnels.In order to investigate the propagation velocity and dynamic initiation toughness of cracks in a tunnel under different impact loads,impact experiments by using green sandstone tunnel models with a mode I crack were carried out by the middle-low speed drop weight impact test system.In the tests,the crack propagation velocity and crack initiation time were measured by crack propagation gauges (CPGs),and the measuring results were analyzed.The dynamic stress intensity factors were calculated by using ABAQUS code,and the dynamic initiation toughness under different dynamic loading rates was obtained by using an experimental-numerical method,and the property of initiation toughness was analyzed.The studying results show that: ① Crack propagation velocities increase with dynamic loading rates,and as loading rate is larger than a certain value,it gradually tends to be a constant value.Crack propagation velocity is slightly less than 0.38 times of the P-wave velocity of sandstone.② Crack initiation time decreases slowly with the dynamic loading rates,and the range of reduction is about 50 μs.③ As the dynamic loading rate increases,the dynamic initiation toughness increases gradually.

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tunnel / crack / dynamic loading rate / crack propagation velocity / dynamic fracture toughness;

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ZHOU Lei，ZHU Zheming，DONG Yuqing，YING Peng，WANG Lei. Effect of dynamic loading rate on crack propagation velocity and dynamic fracture toughness in tunnels[J]. Journal of Vibration and Shock, 2019, 38(4): 129-136

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