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Experimental study on the influence of hydro-chemical erosion on morphology parameters and shear properties of limestone fractures

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Abstract

Hydro-chemical erosion has a great effect on the micro-structure morphology and macroscopic mechanical properties of the rock mass. In this paper, direct shear test system was used to study the hydro-chemical effect on the shear strength characteristics of limestone fractures. Besides, morphology parameters of the fracture under different chemical solutions were also analyzed through three-dimensional laser scanning and electron microscope imaging. Experimental results showed that after hydro-chemical erosion, the profile mean square root deviation Sq, the profile area ratio Rs, the profile peak point density Spd increased, while the slope mean square root Sdq decreased. Combined with scanning electron microscope (SEM) images, it is found that due to the hydro-chemical erosion, the roughness of limestone fracture surface, the discreteness of height distribution of the asperities and the JRC2D values increased, but the slope of asperities decreased. There was a good exponential relation between the decrease percentage of limestone internal friction angle and soaking time, and a logarithmic relation between the decrease percentage of cohesion and soaking time. According to the gray correlation method, the influencing factors were ranked in descending order as follows: normal stress, soaking time and pH values. In addition, the JRC2D value had a negative linear correlation with internal friction angle and cohesion of limestone fracture.

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Abbreviations

S h :

The maximum peak height

S v :

The maximum valley depth t Sq

S q :

The profile mean square root deviation

R s :

The profile area ratio

S pd :

The profile peak point density

S dq :

The slope mean square root

JRC 2D :

The two-dimensional roughness coefficient of rock fracture surface

Z 2 :

The two-dimensional slope root mean square

φ 1, φ 2 :

The internal friction angle of limestone fracture before and after hydro-chemical erosion

D :

The decrease percentage of the internal friction angle

C 1, C 2 :

The cohesion of dry limestone fracture

F :

The decrease percentage of cohesion

p 1 to p 6 :

The fit parameters

t :

The soaking time

z(k):

The reference sequence

x i(k):

The comparison sequence

ρ :

The resolution coefficient

r i :

The gray correlation degree

ζ 1, ζ 2, ζ 3 :

Stand for the pH values, soaking time and normal stress in the gray correlation method

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Acknowledgements

This work was supported by National Natural Science Foundation of China (Nos. 51774268, 51109076), Key Research and Development project of Shanxi Province (No. 20201101009). Besides, the authors are also grateful to the anonymous reviewers for their many helpful comments, which have greatly improved this paper.

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Author notes

  1. Tao Luo and Gangwei Fan contributed to the work equally and should be regarded as co-first authors.

Authors and Affiliations

  1. School of Mines, China University of Mining and Technology, Xuzhou, 221116, China

    Tao Luo, Gangwei Fan & Shizhong Zhang

  2. State Key Laboratory of Coal Resource and Safe Mining, China University of Mining and Technology, Xuzhou, 221116, China

    Gangwei Fan

  3. School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo, 454003, China

    Baohua Guo

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  1. Tao Luo
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Correspondence to Gangwei Fan.

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Luo, T., Fan, G., Guo, B. et al. Experimental study on the influence of hydro-chemical erosion on morphology parameters and shear properties of limestone fractures. Acta Geotech. 16, 3867–3880 (2021). https://doi.org/10.1007/s11440-021-01365-9

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