| 王怀亮,宋玉普.定侧压下大坝原级配混凝土强度和变形试验研究[J].,2010,(3):393-398 |
| 定侧压下大坝原级配混凝土强度和变形试验研究 |
| Research on strength and deformation properties of mass concrete under compressive loading with constant lateral stress |
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| DOI：10.7511/dllgxb201003014 |
| 中文关键词: 大骨料混凝土 定侧压 强度 变形 破坏准则 |
| 英文关键词: mass concrete constant lateral stress strength deformation failure criterion |
| 基金项目:国家自然科学基金资助项目(50908026)；中国博士后基金资助项目(20080441117200902541). |
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| 中文摘要: |
| 利用大连理工大学自行研制改造的液压伺服静动态三轴试验系统进行了不同骨料级配和尺寸的混凝土试件定侧压下的双轴压强度和变形性能试验．试验所用试件有3种:采用大坝原级配最大骨料粒径为80 mm的立方体试件以及相应的湿筛混凝土试件，尺寸分别为250 mm×250 mm×250 mm、150 mm×150 mm×150 mm、100 mm×100 mm×100 mm．试验过程中，测得了所有试件两个加载方向的应力和应变，并根据试验结果，系统地探讨了不同级配混凝土在定侧压下的极限强度和变形、应力-应变曲线以及破坏形态的变化规律，发现大骨料混凝土在定侧压下的极限强度和变形能力要比相应的湿筛小骨料混凝土提高更多；最后分别在主应力空间、主应变空间和八面体应力空间建立了不同级配混凝土的破坏准则，为水工大体积混凝土按多轴强度理论进行设计提供了试验依据． |
| 英文摘要: |
| Experimental study of the deformation and strength of various aggregate grading and sized concrete specimens under biaxial compression with constant lateral stress was carried out with the static-dynamic hydraulic servo triaxial test system designed and manufactured by Dalian University of Technology. Tests were conducted on cubes of 250 mm×250 mm×250 mm fabricated with dam concrete(maximum aggregate of 80 mm), 150 mm×150 mm×150 mm and 100 mm×100 mm×100 mm made with the wet-screened components of dam concrete. The stresses and strains at the biaxial loading direction were recorded for all the specimens during the tests. Based on the test data, the change rule of the biaxial compressive stress, ultimate deformation, stress-strain curves and the failure patterns were studied systematically. Test results indicate that the enhancement effect of the compressive strength and deformation of the mass concretes under biaxial compression become stronger than the wet-screened specimens. Failure criterion of different graded concretes under biaxial compression is established in normal stress space, normal strain space and octahedronal stress space. It provides effective references for the design and safety evaluation of the massive hydraulic structures in which the multi-axial strength of the concrete must be taken into consideration. |
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