Model tests on anomalous low friction and pendulum-type wave phenomena
Model tests on anomalous low friction and pendulum-type wave phenomena作者机构：[a]Engineering Institute of Engineering Corps PLA University of Science and Technology Nanjing Jiangsu 210007 China
出 版 物：《Progress in Natural Science:Materials International》 (自然科学进展·国际材料(英文))
年 卷 期：2009年第19卷第12期
页 面：1805-1820页
核心收录：
学科分类：0709[理学-地质学] 070901[理学-矿物学、岩石学、矿床学] 07[理学]
基 金：supported by the National Natural Sci- ence Foundation of China(Grant No.50525825) the National Basic Research Program of China(Grant No. 2009CB724608) the Natural Science Foundation of Jiangsu Province(Grant No.BK2008002)
主 题：Deep-block rock mass Block-hierarchical structure Anomalous low friction Pendulum-type wave Canonical sequence
摘 要：The anomalous low friction(ALF) and pendulum-type wave(μwave) phenomena were two typical,nonlinear,geo-mechanical,and dynamic responses in deep-block rock mass discovered from in situ observations,which occurred from the movement of the geo-blocks under the impact of external pulses,such as deep confined explosion,earthquake,and rock *** the aim to confirm the existence of the above two phenomena and study the variation laws of them experimentally,laboratory tests on the granite and cement mortar continuum and blocks models were conducted on the self-independently developed multipurpose testing system,*** ALF phenomenon was realized under two loading schemes,the blocks model and working block were acted upon by the joint action of vertical impact and horizontal static force as well as the joint action of both vertical and horizontal impacts with different time *** revealed that the discrete time delays corresponding to the local maximums and minimums of the horizontal displacement amplitudes and residual horizontal displacements of the working block satisfied the canonical sequences with the multiple of 21/2,most of which satisfied the quantitative expression(21/2)~i△/***,the one-dimensional impact experiments were carried out on the blocks granite model,continuum, and blocks cement mortar models,*** on the comparison and analysis of the propagation properties(amplitudes and the Fourier spectrums of acceleration time histories of blocks) of the 1D stress wave in the above models,it is indicated that the fractures in rock mass have tremendous effect on the attenuation of acceleration amplitudes and high-frequency *** comparison of the model test data with the in situ measurement conclusions,the existence of theμwave was confirmed experimentally in the cement mortar blocks model with larger dimensions,and the frequencies corresponding to the local maximums of spectral density curves of three-directional accelera
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