| 张修文,王乾峰*,彭刚,梁甲.水压力下不同孔隙率混凝土的动态力学性能研究[J].实验力学,2020,35(6):1129~1135 |
| 水压力下不同孔隙率混凝土的动态力学性能研究 |
| Study on dynamic mechanical properties of concrete with different porosity under water pressure |
| 投稿时间：2019-11-07 修订日期：2020-01-20 |
| DOI：10.7520/1001-4888-19-209 |
| 中文关键词: 混凝土 水压力 应变速率 孔隙率 |
| 英文关键词:concrete water pressure strain rate porosity |
| 基金项目:国家自然科学基金资助项目(51709155， 51579139) |
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| 中文摘要: |
| 为研究水压力环境下混凝土孔隙率与内部孔隙水对其动态力学性能的影响，对不同孔隙率(F00、F20、F40分别对应粉煤灰掺量为0%、20%、40%)的混凝土在不同水压力进行了不同加载速率下的单轴压缩试验，分析了混凝土的抗压强度、动态增强因子以及F20混凝土的应力应变全曲线。研究结果表明：在水压力较低时，混凝土的抗压强度随应变速率呈非线性增加趋势，表现为增幅减缓；水压力较高时，混凝土的抗压强度随应变速率呈线性增加趋势。混凝土中孔隙水对混凝土的强度产生增强或削弱的效果与水压力、加载速率有关。在1MPa水压力下，围压效应不明显，孔隙水对混凝土抗压强度产生削弱作用，F40混凝土的抗压强度小于F20混凝土；随着水压力升高至3MPa、5MPa，围压效应、水的黏滞效应和速率效应增强，孔隙水对混凝土强度起增强作用，F40混凝土的抗压强度逐渐超过了F20混凝土。 |
| 英文摘要: |
| In order to study the influence of pore structure and internal pore water on the dynamic mechanical properties of concrete under water pressure, the uniaxial compression tests of concrete with different porosity (F00，F20，F40，the corresponding coal ash content are 0%，20%，40% respectively) under different water pressure (dry, 1MPa, 3MPa and 5MPa) and strain rate (10-5/s, 10-4/s, 10-3/s and 10-2/s) are carried out. The compressive strength, dynamic strengthening factor and stress-strain curve of F20 concrete are analyzed. The results show that for low water pressure, the compressive strength of concrete increases nonlinearly with the strain rate, while for high water pressure, the compressive strength of concrete increases linearly with the strain rate. The effect of pore water on the strength of concrete is related to water pressure and loading rate. Under water pressure of 1 MPa, the confining pressure effect is not obvious, and the pore water weakens the compressive strength of concrete. The compressive strength of F40 concrete is less than that of F20 concrete. With the increase of water pressure to 3MPa and 5MPa, the confining pressure effect, water viscosity effect and rate effect are enhanced, and the pore water plays an enhanced role in the strength of concrete. The compressive strength of F40 concrete gradually exceeds that of F20 concrete. |
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