Abstract
Long-term exposure to chemical solutions can change the mineral composition and microstructure and may seriously affect the physical and mechanical properties of rocks. Therefore, to clarify the effects of long-term exposure and types of acids on the mechanical properties of rocks, and to develop the constitutive model of acid-immersed rocks, uniaxial compression tests were carried out on acid-immersed sandstone specimens. The sample weakened, and the brittle failure behavior became more ductile by the acid immersion to the aqueous solution of hydrochloric or sulfuric acids. The duration of the compaction stage of the stress–strain curve increased, that of the elastic stage decreased; the peak stress, elastic modulus, and Poisson's ratio decreased, and the peak point strains increased with the acidity and the immersion duration. The brittle shear failure of the untreated specimen became more axial splitting type failure with acidity. The damage variable of the combined effects of chemical and stress was introduced, and a statistical damage model considering the compaction stage of the stress–strain curve was established based on the damage variable. The model well-simulated the experimentally obtained stress–strain curves of the acid-immersed specimens. Finite element models reflecting the characteristics of the acid-immersed sandstone were established based on CT images.
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Abbreviations
- D:
-
Damage variable of the sample under the combined action of chemistry and load
- D C :
-
Damage variable of the sample attacked by acid solution
- D C 1 :
-
Damage variable of the corroded area
- D C 2 :
-
Damage variable of the uncorroded area
- D m :
-
Damage variable of the sample caused by loading
- E :
-
Elastic modulus
- E(ρ 1):
-
Mathematical expectations of ρ1
- E(ρ 2):
-
Mathematical expectations of ρ2
- F 0 :
-
Weibull distribution parameter
- H :
-
CT number of the sandstone
- H 1 :
-
CT number of the sandstone in the corroded area
- H 2 :
-
CT number of the sandstone in the uncorroded area
- H r :
-
CT number of the sandstone matrix.
- m :
-
Weibull distribution parameter
- ΔV :
-
Volume change
- V e :
-
Elastic volume
- ε v :
-
Volumetric strain
- ε A :
-
Axial strain
- ε L :
-
Radial strain;
- ε ve :
-
Elastic volumetric strain
- ε vc :
-
Fracture volumetric strain.
- σcc :
-
Crack closure stress
- σc :
-
Crack initial stress
- σcd :
-
Damage stress
- σf :
-
Peak intensity
- σ i :
-
I-th principal stress
- ε i :
-
Strain corresponding to σi
- ν :
-
Poisson's ratio
- φ :
-
Internal friction angle
- σ*:
-
Effective stress
- ρ :
-
Density of the sandstone
- ρ 1 :
-
Density of the corroded area of the sandstone
- ρ 2 :
-
Density of the uncorroded area of the sandstone
- ρ r :
-
Density of the sandstone matrix
- ρ 0 :
-
Density of the non-damaged sandstone
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Acknowledgments
This work is supported by the National Key R&D Program of China (Grant No. 2018YFC0808701), the China Postdoctoral Science Foundation (Grant No. 2020M673525), the National Natural Science Foundation of China (Grant No. 41172237), the Shaanxi Province New-Star Talents Promotion Project of Science and Technology (Grant No. 2019KJXX-049) and the Research Project of China Railway 20th Bureau Group Co. Ltd. (Grant No. YF2000SD01A).
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SL: conceptualization, methodology, writing-original draft, investigation, data curation. YW: supervision, conceptualization, writing-review. RH: conceptualization, methodology, writing-review, and editing. ZS: investigation, formal analysis. YF: writing-review and polishing. YS: writing-review and polishing.
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Li, S., Wu, Y., Huo, R. et al. Mechanical Properties of Acid-corroded Sandstone Under Uniaxial Compression. Rock Mech Rock Eng 54, 289–302 (2021). https://doi.org/10.1007/s00603-020-02262-5
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DOI: https://doi.org/10.1007/s00603-020-02262-5