文章摘要
李明超,张梦溪,张津瑞.常态-碾压混凝土联合筑坝材料变形特性与抗剪强度准则研究[J].水利学报,2019,50(2):157-164
常态-碾压混凝土联合筑坝材料变形特性与抗剪强度准则研究
Deformation characteristics and shear strength failure criteria of CC-RCC materials in combined dam structures
投稿时间:2018-12-01  
DOI:10.13243/j.cnki.slxb.20181072
中文关键词: 联合筑坝  常态-碾压混凝土  复合材料试件  剪切破坏准则  数值模拟
英文关键词: combined dam structure  CC-RCC  composite specimens  shear failure criterion  numerical sim-ulation
基金项目:国家自然科学基金项目(51879185);国家优秀青年科学基金项目(51622904);天津市杰出青年科学基金项目(17JCJQJC44000)
作者单位
李明超 天津大学水利工程仿真与安全国家重点实验室, 天津 300354 
张梦溪 天津大学水利工程仿真与安全国家重点实验室, 天津 300354 
张津瑞 天津大学水利工程仿真与安全国家重点实验室, 天津 300354 
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中文摘要:
      联合筑坝形式下坝体的多个部位往往存在大体积常态与碾压混凝土材料共用的情况。坝体结构中两种材料分布部位的多样性和力学性能的差异性是导致坝体出现变形协调问题的主要原因。为分析筑坝材料的变形协调特性,建立了常态-碾压混凝土复合试件细观数值模型,基于实际工程材料性能数据,采用非均质有限元法计算分析了复合试件的细观强度特性,评价了粉煤灰掺量、材料界面倾斜角对联合筑坝复合材料力学性能的影响,结果表明:混凝土复合试件强度介于两种材料之间且随粉煤灰掺量的增加而降低,侧向压应力对复合试件的强度提升较大,根据数值试验数据,提出了联合筑坝形式下复合试件的破坏准则,分析了复合试件斜剪破坏产生机制,验证了剪切破坏准则的有效性与可靠性,研究结果可为联合筑坝材料设计提供参考。
英文摘要:
      In the form of combined damming,many parts of the dam body are jointly poured by large volume conventional and roller compacted concrete. The diversity of the distribution positions of the two materials and the difference of the mechanical properties are the main causes of deformation coordination problem of the dam body. In order to analyze the deformation coordination characteristics of dam materials, mesoscopic mechanical numerical models of CC (Conventional Concrete)-RCC (Roller Compacted Concrete) composite specimens were established. Based on the actual performance of concretes in the dam body, the mesoscopic strength of composite specimen was calculated and analyzed by non-homogeneous finite element method. The effects of fly ash content and material interface slant angle on the mechanical properties of composite materials were evaluated. The results show that the strength of concrete composite specimens is determined by the strength of weaker concrete materials and it decreases with the increase of fly ash content. The lateral compressive stress increases the strength of composite specimens greatly. According to the numerical test data, the failure criterion of composite specimens in the form of combined damming is proposed. Then, the mechanism of slant shear failure of composite specimens is analyzed and the validity and reliability of shear failure criterion are verified. The research results can provide a reference for the design of the material in combined dam structures.
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