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细观均匀化方法预测非饱和混凝土宏观力学性质

ISSN号：0559-9350
期刊名称：水利学报
时间：2013
页码：1317-1325,1332
分类：TU443[建筑科学—岩土工程;建筑科学—土工工程] TB301[一般工业技术—材料科学与工程]
作者机构：[1]北京工业大学城市与工程安全减灾教育部重点实验室,北京100124
相关基金：国家973计划项目（2011CB013600）;国家自然科学基金重大项目（91215301）;北京工业大学创新基金（YB201207）
相关项目：高坝、地下结构及大型洞室群地震灾变集成研究

作者：杜修力|金浏|

关键词：非饱和混凝土, 孔隙率, 饱和度, 弹性模量, 拉伸强度, 峰值应变, unsaturated concrete, effective saturation, porosity, modulus of elasticity, tensile strength, peak tensile strain

中文摘要：

混凝土宏观力学行为由其细观结构和组成决定，孔隙水的存在影响湿态混凝土的力学性质。在细观尺度下，将非饱和混凝土看作是由混凝土基质、孔隙水、干燥及非饱和孔隙组成的多相复合材料，提出了预测非饱和混凝土力学性质的两步均匀化方法。基于该方法建立了非饱和混凝土宏观力学性质，包括弹性模量、泊松比、拉伸强度及峰值拉伸应变与孔隙率及饱和度之间的定量关系。本文理论结果与试验结果吻合良好，证明了方法的合理性。研究表明：湿态混凝土弹性模量、泊松比、拉伸强度和峰值拉伸应变均随饱和度的增大而增大；低饱和度混凝土的峰值拉伸应变随孔隙率的增大而减小，而高饱和度混凝土则呈现先减小后逐渐增大的趋势。

英文摘要：

The macroscopic mechanical behaviors of concrete are dependent on its meso-structure and com- ponents, and pore-water should have a significant effect on the mechanical properties of wet concrete. At the meso-scale, unsaturated concrete is assumed to be a multi-phase composite composed of concrete ma- trix, saturated pore-water, dry and unsaturated pores. A two-step mechanical homogenization technique is introduced for evaluation of the global mechanical properties of unsaturated concrete. Based on the homogeni- zation model, the quantitative relationships are derived between concrete porosity, saturation and the mac- ro-mechanical properties including the modulus of elasticity, Poisson＇s ratio, the effective tensile strength and peak tensile strain of unsaturated concrete. A comparison between the present theoretical results and Ya- man et al.＇s experimental ones in the extreme state indicates that the proposed approach is applicable to predict the effective mechanical properties of wet concrete. Moreover, it can be concluded that the modulus of elasticity, Poisson＇s ratio, tensile strength and peak tensile strain of unsaturated concrete increase as the degree of saturation increases; the peak tensile strain of wet concrete with higher saturation decreases with increasing the porosity, while that with lower saturation increases as concrete porosity increases.

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