Water pressure in propagating concrete cracks
Water pressure in propagating concrete cracks
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DOI：
10.1061/(asce)0733-9445(2000)126:2(235
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发表时间：
2000-02-01
期刊：
影响因子：
--
通讯作者：
Saouma, VE
中科院分区：
文献类型：
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作者：
Slowik, V;Saouma, VE
通过实验和数值研究了混凝土裂缝扩展中的水压。这项研究的最终应用是地震期间和地震后混凝土重力坝的扬压力。在沿裂纹施加静水压力的情况下，对楔形劈裂试样进行了大量试验。研究了水前缘与裂缝前缘的相对速度以及突然裂缝闭合的影响。据观察，对于测试样本，裂纹张开率对内部水压分布有重要影响。如果裂缝张开速率足够慢，则水压有时间形成，而在裂缝快速张开的情况下，水前缘无法跟上裂缝前缘。此外，在裂纹突然闭合时，截留的水充当楔子，在样本中产生拉应力。最后，在实验观察的基础上，建立了裂缝混凝土的电导率模型。这样的模型可以用于遭受地震的混凝土坝的耦合瞬态有限元分析。
Water pressure in propagating concrete cracks is experimentally and numerically investigated. Ultimate application of this study is the uplift pressure in a concrete gravity dam during and after an earthquake. Numerous tests were conducted on wedge splitting specimens with hydrostatic pressure along the crack. Relative velocities of water front versus crack front as well as the effect of sudden crack closure have been investigated. It was observed that, for the tested specimens, the crack opening rate has important consequences on the internal water pressure distribution. If the crack opening rate is slow enough, the water pressure has time to develop, whereas under fast crack openings the water front cannot keep up with the crack front. Furthermore, upon sudden crack closure the trapped water acts as a wedge causing tensile stresses in the specimen. Finally, on the basis of the experimental observations, a model for the conductivity of cracked concrete is developed. Such a model could then be used in the coupled transient finite-element analysis of a concrete dam subjected to an earthquake.