Mechanical Properties and Statistical Damage Constitutive Model of Acid-corroded Sandstone

被引：0

作者：

Miao Z. ^{[1
]}

Li S. ^{[1
,2
]}

Huo R. ^{[1
]}

Ren S. ^{[2
]}

Wu Y. ^{[2
]}

Yang X. ^{[2
]}

机构：

[1] School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an

[2] Post-doctoral Research Workstation, China Railway 20th Bureau Group Co., Ltd., Xi'an

来源：

Tiedao Xuebao/Journal of the China Railway Society | 2023年 / 45卷 / 01期

关键词：

acid corrosion; constitutive model; damage; mechanical properties; sandstone;

D O I：

10.3969/j.issn.1001-8360.2023.01-018

中图分类号：

学科分类号：

摘要：

Acid corrosion environment leads to structural deterioration of tunnels, bridges and buildings, reduction of durability and bearing capacity, shortening of service time, and results in various disasters and accidents. To explore the influence of acid corrosion on sandstone mechanical properties, laboratory long-term accelerated corrosion test was conducted to study the mechanical degradation characteristics of sandstone subjected to hydrochloric acid (HC1) with pH = 1,3,5 and distilled water (H20) with pH = 7. With the help of the analysis results of the CT scan test, continuous damage mechanics and statistical theory, by introducing the chemical-load damage variables, the statistical damage constitutive model considering the stress-strain curve of the acid-corroded sandstone was established. The model was verified based on the uniaxial compression test results. The results show that the compression section of the uniaxial compressive stress-strain curve of the corroded sandstone samples becomes longer as the elastic section becomes shorter. With the decrease of the axial peak stress, elastic modulus and Poisson' s ratio, the axial peak point strains increase. With the increase of the strain at the crack closure point of the acid-corroded rock samples, the lengthening of the crack compression section, and the extension of the crack expansion section, the brittleness characteristics of the rock samples are weakened and the flexible features are enhanced, showing the characteristics of flexible materials. The lower the pH value and the longer the immersion time, the more obvious the damage softening effect of the rock sample. The comparison between the test curve and the theoretical curve shows that the statistical damage constitutive model established in this paper can well reflect the deformation characteristics of the acid-corroded sandstone under load. The research results can provide a theoretical basis for the stability and disaster reduction analysis of the acid-corroded rock masses. © 2023 Science Press. All rights reserved.

引用

页码：141 / 149

页数：8

共 31 条

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