A study on mechanical properties and damage effect of frozen red sandstone under positive gradient impact

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (24) : 1-10.

ZHANG Huimei1，CHEN Shiguan2，WANG Lei2，YUAN Chao2

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Abstract

With the large-scale application of frozen shaft construction in water rich strata in western mining area, it is of great significance to study the mechanical properties and damage effects of frozen wall under different strength impact loads such as blasting and mechanical rock breaking. This paper takes the Cretaceous water rich soft rock crossed by frozen sinking in Wuju coal mine in Gansu Province as the research object, The dynamic characteristics of red sandstone with different frozen temperatures (i.e., 25, -5, -10, -15 and -20 ℃) under positive gradient impact (The impact load is gradually strengthened) are analyzed. At the same time, the changes of pore number, area and porosity of red sandstone during impact are detected by NMR technology, and the damage evolution law of frozen red sandstone under positive gradient impact is analyzed. The results show that the strain rate of frozen red sandstone changes obviously with the decrease of frozen temperature and the temperature effect is significant compared with low and medium velocity impact; The stress and elastic modulus of red sandstone at different frozen temperatures increase with the increase of impact load; The strain reaches the maximum at - 5 ℃, and the growth trend slows down with the decrease of frozen temperature between - 10 ℃ and - 20 ℃; According to the T2 spectrum curve and spectrum area, under the positive gradient impact, the temperature decreases from 25 ℃ to - 10 ℃, the pore size of small pores first decreases and then increases, and the number first increases and then decreases, while the pore size and number of medium and large pores are on the contrary, the spectral area first decreases and then increases, and decreases from - 15 ℃ to - 20 ℃, the number of small pores increases and the pore size decreases, and the number and pore size of medium and large pores increase slightly and stably; The change of porosity is used to define the rock damage degree. It is found that under the positive gradient impact, the damage trend and damage degree of - 10 ℃ red sandstone are the largest, and there are weak damage areas in the range of - 5 ℃ ~ - 10 ℃.
Key words：frozen soft rock；positive gradient impact；dynamic damage；split Hopkinson pressure bar experiment；NMR experiment

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frozen soft rock / positive gradient impact / dynamic damage / split Hopkinson pressure bar experiment / NMR experiment

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ZHANG Huimei1，CHEN Shiguan2，WANG Lei2，YUAN Chao2. A study on mechanical properties and damage effect of frozen red sandstone under positive gradient impact[J]. Journal of Vibration and Shock, 2022, 41(24): 1-10

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