Underground constructions often encounter water environments, where water–rock interaction can increase porosity, thereby weakening engineering rocks. Correspondingly, the failure criterion for chemically corroded rocks becomes essential in the stability analysis and design of such structures. This study enhances the applicability of the Hoek-Brown (H-B) criterion for engineering structures operating in chemically corrosive conditions by introducing a kinetic porosity-dependent instantaneous (KPIM). A multiscale experimental investigation, including nuclear magnetic resonance (NMR), X-ray diffraction (XRD), scanning electron microscopy (SEM), pH and ion chromatography analysis, and triaxial compression tests, is employed to quantify pore structural changes and their linkage with the strength responses of limestone under coupled chemical-mechanical (C-M) conditions. By employing ion chromatography and NMR analysis, along with incorporating the principles of free-face dissolution theory accounting for both congruent and incongruent dissolution, a kinetic chemical corrosion model is developed. This model aims to calculate the kinetic porosity alterations within rocks exposed to varying H concentrations and durations. Subsequently, utilizing the generalized mixture rule (GMR), the kinetic porosity-dependent is formulated. Evaluation of the KPIM-enhanced H-B criterion using compression test data from 5 types of rocks demonstrated a high level of consistency between the criterion and the experimental results, with a coefficient of determination greater than 0.96, a mean absolute percentage error less than 4.84%, and a root-mean-square deviation less than 5.95 MPa. Finally, the physical significance of the porosity-dependent instantaneous is clarified: it serves as an indicator of a rock’s capacity to leverage the confining pressure effect.

中文翻译：

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针对遭受化学腐蚀的岩石的增强型 Hoek-Brown (HB) 标准


地下建筑经常遇到水环境，水-岩相互作用会增加孔隙度，从而削弱工程岩石。相应地，化学腐蚀岩石的破坏准则在此类结构的稳定性分析和设计中变得至关重要。这项研究通过引入动态孔隙度相关瞬时 (KPIM)​​ 增强了 Hoek-Brown (HB) 准则对于在化学腐蚀条件下运行的工程结构的适用性。采用多尺度实验研究，包括核磁共振 (NMR)、X 射线衍射 (XRD)、扫描电子显微镜 (SEM)、pH 和离子色谱分析以及三轴压缩测试，以量化孔隙结构变化及其与化学-机械耦合 (CM) 条件下石灰石的强度响应。通过采用离子色谱和核磁共振分析，并结合考虑一致和不一致溶解的自由面溶解理论原理，开发了动力学化学腐蚀模型。该模型旨在计算暴露于不同 H 浓度和持续时间的岩石内的动力学孔隙度变化。随后，利用广义混合规则（GMR），制定了动力学孔隙率依赖性。利用5种岩石的压缩试验数据对KPIM增强HB准则进行评价，结果与实验结果高度一致，判定系数大于0.96，平均绝对百分比误差小于4.84%，均方根偏差小于5.95 MPa。 最后，澄清了与孔隙度相关的瞬时值的物理意义：它可以作为岩石利用围压效应能力的指标。