岩石–混凝土界面黏结强度冻融劣化模型及试验分析

doi:10.13722/j.cnki.jrme.2019.1037

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摘要首先从“地质体–工程体”二元介质材料界面黏结机制出发，探究影响岩石–混凝土界面黏结性能的控制性指标，并构建二元体介质界面黏结强度理论表征；而后，通过内在认知冻融对界面黏结性能的劣化过程，提出岩石–混凝土界面黏结强度冻融劣化模型。为进一步验证模型准确性及评价效果，以花岗岩–混凝土二元体试样为对象，开展不同界面粗糙度(JRC)及循环次数的界面黏结性能剪切试验，试验结果较好验证了理论模型的可靠性。该模型综合考虑界面表观特征、混凝土C-S-H基团“树根桩”效应及冻融损伤劣化特征，为认知岩石–混凝土界面黏结强度冻融劣化提供了理论参考。此外，为深入认知界面黏结性能冻融劣化理论模型与实测值误差原因，围绕壁面强度分配系数、界面破坏形貌分析特征、NMR分层细观分析技术及界面黏附强度冻融劣化耦合特征予以进一步讨论，拓展了冻融诱发界面黏结性能劣化认知深度。研究成果可为评价冻融诱发岩石–混凝土界面黏结强度劣化提供理论及试验依据。

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	申艳军1
	2
	魏欣3
	杨更社3
	王永志3
	贾海梁3
	张欢3
	张慧梅4

关键词 ：岩石力学；岩石&ndash, 混凝土二元体；黏结强度；冻融循环；劣化机制；试验验证

Abstract：In this paper，starting from the interface bonding mechanism of “geological body—engineering body”binary media materials，the control indexes affecting the bonding performance of rock-concrete interface were explored，and the theoretical characterization of the interface bonding strength of binary media was constructed. Then，a bond strength freeze-thaw degradation model of rock-concrete interface was proposed through the internal cognition of the degradation process of the interface bonding performance under freeze-thaw. For further verifying the accuracy and evaluation effect of the proposed model，shear tests of interface-bonding performance with different interface roughness (JRC) and freeze-thaw cycles were carried out on granite-concrete binary samples，and it is shown that the test results are consistent with the theoretical calculations. The model comprehensively considers the interface apparent characteristics，concrete C-S-H group “root pile” effect and freeze-thaw damage deterioration characteristics，and provides a theoretical reference for understanding freeze-thaw deterioration of rock-concrete interface bond strength. Additionally，in order to thoroughly cognize the cause of the error between the freeze-thaw deterioration theoretical model of the interface bond properties and the measured values，further discusses were carried out about wall strength distribution coefficient，characteristics of interface failure morphology analysis，NMR layered microscopic analysis technology and coupling characteristics of interface bond strength freeze-thaw deterioration，which expands the cognitive depth of interface bond properties deterioration induced by freeze-thaw. The research results can provide theoretical and experimental basis for evaluating the deterioration of bond strength between rock and concrete caused by freeze-thaw.

引用本文:

申艳军1，2，魏欣3，杨更社3，王永志3，贾海梁3，张欢3，张慧梅4. 岩石–混凝土界面黏结强度冻融劣化模型及试验分析[J]. 岩石力学与工程学报, 2020, 39(3): 480-490.
SHEN Yanjun1，2，WEI Xin3，YANG Gengshe3，WANG Yongzhi3，JIA Hailiang3，ZHANG Huan3，ZHANG Huimei4. Freeze-thaw degradation model and experimental analysis of rock-concrete interface bond strength. , 2020, 39(3): 480-490.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2019.1037 或 http://rockmech.whrsm.ac.cn/CN/Y2020/V39/I3/480

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