Effects of freeze-thaw cycles on dynamic fracture initiation characteristics of surrounding rock with pure Ⅰ type fracture under impact loads

JIANG Yacheng; ZHOU Lei; ZHU Zheming; LI Jianfei; NIU Caoyuan; YING Peng

doi:10.11883/bzycj-2020-0330

Volume 41 Issue 4

Apr. 2021

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JIANG Yacheng, ZHOU Lei, ZHU Zheming, LI Jianfei, NIU Caoyuan, YING Peng. Effects of freeze-thaw cycles on dynamic fracture initiation characteristics of surrounding rock with pure Ⅰ type fracture under impact loads[J]. Explosion And Shock Waves, 2021, 41(4): 043104. doi: 10.11883/bzycj-2020-0330

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Effects of freeze-thaw cycles on dynamic fracture initiation characteristics of surrounding rock with pure Ⅰ type fracture under impact loads

doi: 10.11883/bzycj-2020-0330

JIANG Yacheng^{1, 2
,},
ZHOU Lei^{1, 2
,
,},
ZHU Zheming^{1, 2},
LI Jianfei^{1, 2},
NIU Caoyuan^{1, 2},
YING Peng^{1, 2}

1.
College of Architecture and Environment, Sichuan University, Chengdu 610065, Sichuan, China
2.
MOE Key Laboratory of Deep Underground Science and Engineering, Sichuan University, Chengdu 610065, Sichuan, China

Received Date: 2020-09-21
Rev Recd Date: 2020-11-16

Available Online: 2021-04-14

Publish Date: 2021-04-14

Abstract

Abstract

In order to investigate the dynamic initiation and evolution of mode Ⅰ crack in surrounding rock under the action of freeze-thaw cycle, taking a cold area tunnel as the engineering background, the freeze-thaw cycle test and large-scale drop weight test were carried out by using tunnel model specimens that were made of green sandstone in Sichuan province. The dynamic mechanical characteristics of specimens after different freeze-thaw cycles were measured and discussed. The elastic modulus and Poisson’s ratio of the specimens were calculated by longitudinal wave velocity, shear wave velocity. The dynamic strain gauges were glued at the incident plate and transmitted plate to collect voltage signals. The voltage signal was applied to calculate the curves of dynamic loading versus time recorded from the incident plate and transmission plate. Crack initiation time was determined by using a crack propagation gauge (CPG) measuring system. A traditional finite element method code was applied to establish some numerical models to calculate the curves of dynamic stress intensity factor under impact loads. The experimental-numerical method was used to determine dynamic fracture initiation toughness according to crack initiation time. A scanning electron microscope (SEM) was applied to analyze the micro-structure of sandstone material after different freeze-thaw cycles, and the mesoscopic damage mechanism of rock materials was obtained. The test results show that the longitudinal wave velocity, shear wave velocity and elastic modulus of sandstone gradually decrease with the number of freeze-thaw cycles, while Poisson’s ratio increases with the number of freeze-thaw cycles. The crack initiation time and dynamic initiation toughness of rock material decrease with the number of the freeze-thaw cycles. The cement material inside the rock will loss due to the effect of freeze-thaw cycles, and the pores and micro-cracks of the sandstone also increase with the number of freeze-thaw cycles.
- freeze-thaw cycles,
- tunnel model,
- dynamic initiation toughness,
- mesoscopic damage mechanism

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