大骨料混凝土三轴受压动态强度试验研究

摘要

为了满足水工结构抗震分析和设计的需要，利用大连理工大学的大型液压伺服三轴试验系统，对大骨料混凝土和湿筛混凝土立方体试件进行了动态三轴受压试验，研究了应力比和应变率对湿筛混凝土的三轴抗压强度的影响。试验结果表明，两种混凝土的三轴抗压强度均高于其单轴抗压强度；湿筛混凝土的三轴抗压强度的提高值随应力比的不同而略有差别，随着应变率的增加而增加。根据试验结果，在八面体应力空间建立了湿筛混凝土的破坏准则，为水工结构物的非线性分析提供了试验依据。%In order to meet the needs of the seismic analysis and design of hydraulic structures,the dynamic triaxial com-pression tests on the cubic specimens of large aggregate concrete and wet-screened concrete were carried out by using a large hydraulic-serve triaxial test system of Dalian University of Technology.The effects of stress ratio and strain rate on the triaxial compression strength of wet-screened concrete were studied through the tests.The experimental results prove that the triaxial compression strengths of the two kinds of concrete are higher than the uniaxial compression strengths;the triaxial compression strength of wet-screened concrete increases differently along with the different stress ratios and in-creases along with the increase of the strain rates.Based on the experimental results,the failure criterion for wet-screened concrete is established in an octahedral stress space,which can provide experimental basis for the nonlinear analysis of hydraulic structures.