| 吕从聪,杨国栋,吴振超,李宗利,卢晓春,田斌.考虑初始裂缝形态影响的混凝土细观水力劈裂研究[J].水利学报,2025,56(11):1432-1442,1453 |
| 考虑初始裂缝形态影响的混凝土细观水力劈裂研究 |
| Effect of initial crack morphology on meso-scale hydraulic fracturing in concrete |
| 投稿时间：2025-04-10 修订日期：2025-11-19 |
| DOI：10.13243/j.cnki.slxb.20250217 |
| 中文关键词: 初始裂缝 混凝土水力劈裂 细观尺度 内聚力单元 临界开裂水压 |
| 英文关键词: initial crack hydraulic fracturing of concrete meso-scale cohesive element critical cracking water pressure |
| 基金项目:国家自然科学基金项目（52209164）；国家重点研发计划项目（2017YFC405101） |
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| 中文摘要: |
| 为探究细观尺度下混凝土水力劈裂裂缝的扩展演化规律，引入砂浆渗透系数随损伤演化的关系，建立可反映渗流-应力耦合作用的细观混凝土孔压内聚力模型，重点分析细观尺度下初始裂缝倾角、长度、多条裂缝及特殊形态裂缝对水力劈裂破坏的影响。研究结果表明，初始裂缝倾角差异诱导主裂缝贯穿点发生偏移；临界开裂水压随初始裂缝长度增加而降低，裂缝长度由5 mm增至20 mm时下降尤为显著；相较于单条裂缝，多条初始裂缝不仅劣化混凝土抗劈裂性能，还导致稳定扩展水压出现非周期性剧烈震荡。此外，特殊形态裂缝影响裂缝与界面过渡区的连接方式，易诱发更复杂的开裂模式。初始裂缝形态对混凝土水力劈裂临界开裂水压与裂缝扩展路径具有重要影响。本研究可为混凝土结构水力劈裂破坏的预测与防控提供参考。 |
| 英文摘要: |
| To investigate the propagation and evolution patterns of hydraulic fracturing cracks in concrete at the meso-scale，the relationship between the permeability coefficient of mortar and the internal damage evolution of the matrix was introduced，and a meso-concrete pore pressure cohesion model that can reflect the seepage-stress coupling effect was established. This study examined the effects of initial crack dip angle，initial crack length，multiple initial cracks，and special initial cracks on hydraulic fracturing failure at the meso-scale. The results indicate that the differences in the initial fracture dip angle can cause the deviation of the penetration point of the main crack. As the initial crack length increases，the critical cracking water pressure decreases. Particularly，when the crack length increases from 5 mm to 20 mm，the critical cracking water pressure drops significantly. Compared to a single initial crack，the presence of multiple initial cracks not only weakens the splitting resistance of concrete but also induces non-periodic severe fluctuations in the water pressure for steady propagation of the cracks. Additionally，it is concluded that special initial cracks can affect the connection between cracks and the interfacial transition zone at the meso-scale，potentially inducing more complex cracking patterns. The morphology of initial cracks significantly influences the critical cracking water pressure and crack propagation path of concrete hydraulic fracturing. The research provides a reference for predicting and preventing hydraulic fracturing failure in concrete structures. |
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