摘要
透水性混凝土作为多孔材料,能有效减少城市内涝并促进“海绵城市”建设。其孔隙结构不仅决定优异的透水性能,同时对力学行为影响显著。基于Mori-Tanaka理论,采用多步均匀化方法,得到了透水性混凝土等效力学与热学性能参数的解析表达。结合有限元方法,模拟了透水性混凝土在外荷载下的变形特征,并分析了不同孔隙率条件下的变形与应力分布。研究发现,高孔隙率显著降低透水性混凝土的力学性能,而尖锐的孔隙几何特征导致强应力集中。此外,渗水特性分析表明,渗流速度随地基深度增加呈指数性下降。针对寒旱地区冬季结冰影响的分析显示,孔隙水结冰膨胀会给混凝土产生较大边界应力,易造成接触界面破坏。从孔隙结构、透水行为与温度环境等方面出发,揭示透水性混凝土性能的主要影响因素,为其在城市基础设施中的推广应用提供理论依据。
Permeable concrete,as a porous material,can effectively reduce urban flooding and promote the construction of sponge cities.Its pore structure not only determines its excellent permeability but also significantly affects its mechanical behavior.Based on the Mori-Tanaka theory and employing a multi-step homogenization method,it derived analytical expressions for the equivalent mechanical and thermal performance parameters of permeable concrete.By combining this with finite element methods,it simulated the deformation characteristics of permeable concrete under external loads and analyzed the deformation and stress distribution under different porosity conditions.It found that high porosity significantly reduces the mechanical performance of permeable concrete,while sharp pore geometries lead to strong stress concentrations.Furthermore,the analysis of seepage characteristics indicated that the seepage velocity decreases exponentially with increasing foundation depth.An analysis of the impacts of winter icing in cold and arid regions showed that the expansion of pore water during freezing causes significant boundary stresses in the concrete,making it prone to damage at contact interfaces.It the main influencing factors of permeable concrete performance from the perspectives of pore structure,permeability behavior,and temperature environment,providing a theoretical basis for its promotion and application in urban infrastructure.
作者
徐大斌
李成彬
张博
张伟
李珑
张娟娟
XU Dabin;LI Chengbin;ZHANG Bo;ZHANG Wei;LI Long;ZHANG Juanjuan(Gansu No.9 Construction Group Co.,Ltd,Wuwei 733000,China;Civil Engineering and Mechanics College,Lanzhou University,Lanzhou 730000,China)
出处
《混凝土》
北大核心
2025年第10期173-180,共8页
Concrete
基金
武威市重点研发计划项目“寒旱地区透水混凝土关键技术研究与应用”(WW2202YFG001)
中央高校基本科研业务费专项资金(lzujbky-2025-03)。
关键词
透水性混凝土
多步均匀化
有限元
力学行为
渗流
冻胀
permeable concrete
multi-step homogenization
finite element
mechanical behavior
seepage
frost heave
