Dynamic Splitting Characteristics of Freeze-Thawed Sandstone at Different Loading Rates

doi:10.12068/j.issn.1005-3026.2024.01.014

Abstract

Abstract:

In order to study the effects of loading rate and freeze-thaw cycles on the dynamic splitting characteristics of sandstone，static and dynamic splitting tests with different loading rates were conducted on sandstone subjected to 0， 25， 50， 75 and 100 freeze-thaw cycles，and the static and dynamic tensile strength of freeze-thaw sandstone，as well as the change law of dissipation energy under impact load were discussed.The results show that the static and dynamic tensile strength，the P-wave velocity and the mass loss rate of freeze-thaw sandstone deteriorate with an increase in the number of freeze-thaws cycles.The dynamic strength increase factor（DIF）increases with the increase of freeze-thaw cycles and loading rate，and a higher degree of the freeze-thawing damage in sandstone results in a more significant increase in DIF with loading rate.The dynamic tensile strength prediction model based on freeze-thaw damage and loading rate can reflect the strength change of sandstone effectively.The greater the freeze-thaw damage of sandstone，the faster the change of dynamic tensile strength with loading rate.The dissipation energy under impact load decreases with the increase of freeze-thaw cycles and increases with higher loading rate.

Key words: freeze-thaw cycle, loading rate, damage, dynamic tensile strength, energy dissipation

CLC Number:

TU 452

Peng JIA, Song-ze MAO, Yi-jin QIAN, Jia-liang LU. Dynamic Splitting Characteristics of Freeze-Thawed Sandstone at Different Loading Rates[J]. Journal of Northeastern University(Natural Science), 2024, 45(1): 111-119.

Figures/Tables 18

Fig. 1 Freeze‐thaw cycle test

Fig. 2 Static mechanical loading device

Fig. 3 SHPB loading device

Fig. 4 Waveform balance diagram

Fig. 5 Calculation principle of loading rate

Fig. 6 Relationship between impact velocity and loading rate

Fig. 7 Mechanical properties of freeze‐thaw

Fig. 8 Physical parameters variation

Fig. 9 Time‐stress curves of freeze‐thaw sandstone

Fig. 10 Relationship between number of freeze‐thaws and dynamic tensile strength

Fig. 11 Relationship between number of freeze‐thaws and dynamic strength increase factor

Fig. 12 Dynamic splitting damage model

Fig. 13 Freeze‐thaw damage factor variation law based on P‐wave velocity

Table 1 Fitting parameters of empirical equation

冻融次数	冻融损伤因子	$α$	$β$	拟合度 $R 2$
0	0	0.019	0.37	0.91
25	0.13	0.011	0.41	0.89
50	0.21	0.007	0.45	0.95
75	0.33	1.64×10^-4	0.78	0.99
100	0.40	5.89×10^-5	0.86	0.92

Table 1 Fitting parameters of empirical equation

冻融次数	冻融损伤因子	$α$	$β$	拟合度 $R 2$
0	0	0.019	0.37	0.91
25	0.13	0.011	0.41	0.89
50	0.21	0.007	0.45	0.95
75	0.33	1.64×10^-4	0.78	0.99
100	0.40	5.89×10^-5	0.86	0.92

Fig. 14 Dynamic tensile strength of freeze‐thaw sandstone at different loading rates

Fig. 15 Evolution curves of dissipated energy

Fig. 16 Relationship between number of freeze‐thaw and dissipated energy

Fig. 17 Relationship between loading rate and dissipated energy

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