井壁混凝土三轴渗透试验及细观数值分析
Triaxial Permeability Test and Meso-numerical Analysis of Well Wall Concrete
闵通 1薛维培 2姚直书 1荣传新 1罗勇 3杨理 4申磊1
作者信息
- 1. 安徽理工大学土木建筑学院,安徽 淮南 232001
- 2. 安徽理工大学土木建筑学院,安徽 淮南 232001;安徽理工大学深部煤矿采动响应与灾害防控国家重点实验室,安徽 淮南 232001
- 3. 淮南矿业(集团)有限责任公司博士后科研工作站,安徽 淮南 232001
- 4. 华亭煤业大柳煤矿有限公司生产技术科,甘肃 平凉 744100
- 折叠
摘要
目的 为研究井壁混凝土在多轴应力下渗透率演化规律.方法 以50mm×100mm的圆柱体混凝土试件为研究对象,采用试验与数值模拟相结合的方法,分析流-固耦合状态下渗透性能变化.结果 围压能密实孔隙,使渗透率下降,但下降趋势逐渐变缓.孔隙水压易使裂纹扩展,加剧水渗透,同时上升趋势逐级递增;轴压对渗透率的影响与内部孔隙及微裂纹状态相关,根据渗透率不同变化趋势,可将其分为4个阶段;由数值模拟发现,随着应变增加,混凝土内部拉应力分布变广,裂缝多出现在拉、压应力集中区;轴压增加虽使整体孔隙密实,但颗粒挤压易使微裂隙萌生,加载后期成为主要渗流通道.结论 研究结果为实际工程中解决复杂应力状态下混凝土渗透率变化等问题提供了参考.
Abstract
Objective In order to study the evolution of permeability of well wall concrete under multi-axial stress.Methods A combination of experiments and numerical simulations was used to analyze the changes of the permea-bility properties under flow-solid coupling condition for cylindrical concrete specimens of 50mm × 100mm.Results The results showed that the confining pressure could compact the pores and decrease the permeability,but the downward trend slowed down gradually.Pore water pressure was easy to cause crack propagation,aggravated wa-ter permeability,and the rising trend increased step by step at the same time.The effect of axial pressure on per-meability was related to the state of internal pores and microcracks,which could be divided into four stages ac-cording to the changing trend of permeability.It was found by the numerical simulation that with the increase of strain,the distribution of tensile stress in concrete be wider,and the cracks mostly appear in the tension and com-pression stress concentration area.Although the increase of axial pressure made the whole pores dense,the parti-cle extrusion was easy to cause the initiation of microcracks,which became the main seepage channel in the later stage of loading.Conclusion This paper provides a reference for solving problems such as concrete permeability changes under complex stress conditions in practical engineering.
关键词
井壁混凝土/三轴渗透/渗流-应力耦合/数值模拟/渗流通道Key words
well wall concrete/triaxial permeation/seepage-stress coupling/numerical simulation/seepage channel引用本文复制引用
基金项目
国家自然科学基金青年项目(52308228)
国家自然科学基金面上项目(52174104)
教育部"春晖计划"合作科研项目(HZKY20220204)
安徽省自然科学基金面上项目(2208085ME146)
安徽省自然科学基金面上项目(2108085ME155)
深部煤矿采动响应与灾害防控国家重点实验室自主课题(SKLMRDPC20ZZ05)
出版年
2024
NETL
NSTL
万方数据