文献类型：期刊文献

中文题名：泥岩渐进水侵胶结失效特性:试验与数值模拟研究

英文题名：Failure mechanisms of cementation degradation due to progressive water intrusion in mudstone:an experimental and numerical study

作者：许嘉徽 赵海森 李桂臣 孙长伦 荣浩宇 李菁华

第一作者：许嘉徽

机构：[1]中国矿业大学矿业工程学院,江苏徐州221116;[2]中国矿业大学深地工程智能建造与健康运维全国重点实验室,江苏徐州221116;[3]贵州理工学院矿业工程学院,贵州贵阳550003

第一机构：中国矿业大学矿业工程学院,江苏徐州221116

年份：2026

卷号：47

期号：4

起止页码：1459-1471

中文期刊名：岩土力学

外文期刊名：Rock and Soil Mechanics

收录：;WOS:【ESCI(收录号:WOS:001827419100001)】；北大核心:【北大核心2023】；

基金：国家自然科学基金(No.U22A20165,No.52174089);中央高校基本科研业务费专项资金(No.2020ZDPY0221);中国矿业大学未来杰出人才助力计划(No.2022WLKXJ043)。

语种：中文

中文关键词：泥岩;渐进水侵;吸/脱水;异变分层;PFC建模

外文关键词：mudstone;progressive water intrusion;aspiration/dehydration;variation stratification;PFC modelling

摘要：目前关于泥岩水侵失效特性数值模拟研究通常采用统一更新试样细观参数的校核方法,无法准确反映试样在不同条件下的力学响应差异,有必要根据泥岩的实际失效行为更新模拟方式,以获得更准确的模拟结果。引入相对含水率(relative moisture content,简称RMC)表征不同加湿/加热条件对泥岩力学特性的直接影响,分别构建一般模型与异变分层(variant stratification,简称VS)模型,基于宏观单轴抗压强度与表面微观力学强度之间的联系标定细观力学参数,进而分析各试样的胶结失效特性。结果表明:不同加湿/加热条件下试样宏微观强度差异明显,单轴抗压强度随RMC提升而减弱;试样强度与VS模型异变厚度呈现明显的线性相关性。相较于一般模型,VS模型张拉破坏裂隙与剪切破坏裂隙的数目与占比不同,但不同水侵状态下的破坏形态与实际试验结果更相符;对于不同条件下峰值应变能与胶结能,一般模型变化显著,而VS模型呈现缓和过渡。通过分析模拟试样强度变化、破坏形态及能量释放等特征,揭示了泥岩胶结失效特性,验证了VS模型试样结果的合理性。
Current numerical simulation studies on water intrusion failure characteristics of mudstone usually update the whole model mesoscale mechanical parameter as the calibration method,which cannot accurately reflect the differences in mechanical responses of specimens under different conditions.To improve accuracy,the simulation method should be updated to reflect the actual failure behavior of mudstone.Relative moisture content(RMC)is introduced to characterize the direct effect of mudstone under different humidification/heating conditions.The general model and the variant stratification(VS)model were constructed,and the mesoscale mechanical parameters were calibrated using the relationship between macroscopic uniaxial compressive strength and surface micromechanical strength to analyze the cementation failure characteristics of each specimen.The results showed that the macroscopic and microscopic strength of the specimens under different humidification/heating conditions varied significantly,and the uniaxial compressive strength weakened with the increase of RMC.The strength of the specimens showed an obvious linear correlation with the thickness of the VS model anisotropy.Compared with the general model,the number and percentage of tension damage cracks and shear damage cracks of the VS model were different,while the damage patterns under different water intrusion conditions were more consistent with the actual test results.Under different conditions,the general model changed significantly for the peak strain energy and cementation energy,while the VS model showed a gentle transition.By analyzing strength variation,damage patterns,and energy release in the simulated specimens,we revealed the mudstone cementation failure characteristics and validated the results for the VS-model specimens.