连续充填型结构面峰前循环破坏特征及再载强度特性试验研究

doi:10.13722/j.cnki.jrme.2021.0266

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摘要通过自行设计的岩体结构面循环荷载试验装置，开展了连续充填型结构面峰前循环荷载试验。研究不同循环次数、循环频率、循环振幅、充填物厚度、充填物强度以及循环法向荷载作用下结构面的破坏特征及循环后结构面再加载剪切强度行为特性。研究结果表明：在峰前循环过程中，充填型结构面的破坏主要经历了充填物滑移裂缝形成→充填物由整体变松散→松散充填物相互磨损→结构面岩体及充填物混合磨损4个阶段；循环后的结构面再载强度随着循环次数、循环频率、循环振幅以及循环法向应力的增加而减小，再载强度变化率也随充填物厚度及充填物强度的增加而减小。结构面再载峰值剪切位移变化与循环频率、振幅、充填物厚度、充填物强度变化成正比，但与循环法向应力变化成反比；再载法向剪胀最大位移随着循环次数的增加而逐渐减小，并且达到最大法向位移时所需要的剪切位移也有进一步增加的趋势。分别以临界频率和临界循环次数为参照，提出了结构面维持及结束峰前循环阶段的临界条件，并提出了结构面在不同影响因子下强度弱化回归模型，该模型能够可靠预测结构面在经过不同峰前循环次数后再载峰值剪切强度的变化。

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	何刘1
	赵志明1
	潘岳1
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	刘浪1

关键词 ：岩石力学, 连续充填型结构面, 峰前循环荷载, 再载力学行为, 强度弱化, 强度回归模型

Abstract：In this paper，a series of cycle loading tests on continuous infilled artificial rock joint specimens were performed by using the self-designed cyclic loading test apparatus to investigate the failure characteristics in the pre-peak cyclic loading stage and the reloading mechanical behaviors. The influences of cyclic number，cyclic frequency，cyclic amplitude，infilled thickness，infilled material strength and cyclic normal stress were considered extensively. It was found that in the pre-peak cyclic stage，the joint failure includes four steps such as formation of infilled material fractures，loose fragments of the infilled material，wear of the loosed fragments wear and mixed wear of the rock joint fragments and the loosed fragments. With increasing the cyclic number，the frequency，the amplitude or the cyclic normal stress，the reloading peak shear strength decreases. The change rate of the reloading shear strength decreases with the infilled thickness and the infilled material strength. The reloading peak shear displacement of the joints is positively correlated with the cyclic frequency，the amplitude，the thickness and the strength of the infilled material，but negatively correlated with the cyclic normal stress. Besides，the reloading maximum dilation displacement decreases with the number of cycles，and the shear displacement of the joint for obtaining the maximum normal dilatancy displacement also has a trend of further increase. Finally，Taking the critical frequency and the critical cyclic number as references，the critical conditions for remaining and terminating the pre-peak cyclic loading stage were presented. Based on multiple regression，a prediction model for the strength of the infilled joint under different influence factors was proposed. The results indicate that the model can reliably predict the variety of the reloading peak shear strength of the infilled joints after various pre-peak cycles.

Key words： rock mechanics continuous infilled rock joints pre-peak cyclic loading reloading mechanical behavior strength degradation strength regression model

引用本文:

何刘1，赵志明1，潘岳1，2，刘浪1. 连续充填型结构面峰前循环破坏特征及再载强度特性试验研究[J]. 岩石力学与工程学报, 2021, 40(10): 2027-2037.
HE Liu1，ZHAO Zhiming1，PAN Yue1，2，LIU Lang1. Experimental study on the damage properties and reloading strength characteristics of continuous infilled rock joints under pre-peak cyclic loading. , 2021, 40(10): 2027-2037.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0266 或 http://rockmech.whrsm.ac.cn/CN/Y2021/V40/I10/2027

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