| 砂浆-花岗岩界面动态轴向拉伸力学性能试验研究 |
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| 引用本文： | 王瑶,吴胜兴,沈德建,周继凯.砂浆-花岗岩界面动态轴向拉伸力学性能试验研究[J].岩土力学,2012,33(5):1319-1326. |
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| 作者姓名： | 王瑶 吴胜兴 沈德建 周继凯 |
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| 作者单位： | 1.河海大学 土木与交通学院，南京 210098；2.金陵科技学院 建筑工程学院，南京 211169 |
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| 基金项目： | 国家自然科学基金面上项目(No.50979032);国家自然科学基金青年基金(No.5100905);中国水利水电科学研究院开放基金项目(No.IWHRKF2010014) |
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| 摘 要： | 骨料-砂浆界面过渡区的力学性能对混凝土宏观受力特性有很重要的影响。在MTS试验机上对40个砂浆-花岗岩交界面试件进行了动态轴向拉伸力学性能试验研究，分析不同应变率（10-6～10-2 s-1）、不同程度预静载（30%、50%、70%静载强度）以及往复荷载（1、5 Hz）对交界面动态轴向拉伸力学性能的影响，并对其动态破坏机制进行了初探。研究结果表明：①交界面动抗拉强度随应变率增加有明显增加趋势；②较小预静载（不超过50%）不仅没有使动抗拉强度降低，反而有可能提高动抗拉强度，较大的预静载对损伤弱化效应起主导作用，从而使动抗拉强度降低；③往复荷载作用下会出现明显的低周疲劳损伤，而且残余变形随往复荷载的频率增加而减小；④不同应变率下的交界面应力-应变曲线上升段类似，约50%强度后呈现非线性变化，但非线性程度随应变率增加趋向不明显。另外，尝试性地进行了交界面试件轴向拉伸应力-应变全曲线的试验，得到了稳定断裂的全过程曲线。
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| 关 键 词： | 砂浆-花岗岩交界面 动态轴向拉伸 冲击荷载 预静载 循环荷载 |
| 收稿时间： | 2010-11-24 |
Experimental study of dynamic axial tensile mechanical properties of mortar-granite interface |
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| WANG Yao
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WU Sheng-xing
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SHEN De-jian
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ZHOU Ji-kai.Experimental study of dynamic axial tensile mechanical properties of mortar-granite interface[J].Rock and Soil Mechanics,2012,33(5):1319-1326. |
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| Authors: | WANG Yao WU Sheng-xing SHEN De-jian ZHOU Ji-kai |
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| Institution: | 1. College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China; 2. Architectural Engineering Institute (College), Jinling Institute of Technology, Nanjing 211169, China |
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| Abstract: | The mechanical behavior of mortar-aggregate interface transition zone is critical to the macro mechanical properties of concrete.A series of dynamic axial tensile tests on 40 mortar-granite interfaces specimens are carried out on MTS.Effects of different strain rates(10-6～10-2 s-1),different initial static loads(30%、50%、70%) and the cyclic load(frequency of 1、5 Hz) on the dynamic axial tensile mechanical properties are analyzed.The fracture mechanism is explored based on the experiment results.The results indicate that: ① the dynamic tensile strength of the interface is increased obviously with the increasing of the strain rate;② the initial static load about less than 50 percent of the strength will not influence the dynamic tensile strength but maybe beneficial for it;more initial static load will be harmful to the dynamic strength because of the damage effect;③ the fatigue damage by cyclic variable amplitude load leads to the descending of strength because of the cumulative damage.Residual strain decreases with the increasing of cycle frequency;④ the ascending branch of the stress-strain curve before 50% tensile strength can be looked as straight line and then it goes into nonlinear stage which will trend toward linear with the increasing of strain rate.In addition,the complete stress-strain curve of interface is achieved on the condition of stable fracture. |
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| Keywords: | mortar-granite interface dynamic axial tension impact load initial static load cyclic load |
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