灰岩岩样等幅和分级循环加卸载过程中电阻率响应规律研究

doi:10.13722/j.cnki.jrme.2014.1718

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摘要

为研究受载过程中特别是循环加卸载作用下岩石电阻率变化规律，对单轴等幅循环加卸载和分级循环加卸载条件下岩石破坏过程中的电阻率响应特征进行研究。试验结果表明，岩石电阻率变化与荷载变化或试件内微裂隙发展密切相关。等幅循环加卸载过程中，加载时随着荷载的增加，岩石的电阻率总体上呈下降的变化趋势；第1次加载循环与其他4次加载循环明显不同，在加载初期存在快速下降阶段；卸载时，试样电阻率会逐渐恢复；5次加载循环中，完全卸载(载荷0 kN)和完全加载(载荷40 kN)时，不同循环电阻率不同，第一次最大，以后逐次减小。分级循环加卸载与等幅循环加卸载存在一些相同的规律，不同之处在于：5次加载循环中，完全卸载(载荷0 kN)和完全加载(载荷取第一级完全加载时荷载35 kN)时，不同循环电阻率也不同，前3次循环电阻率依次减小，后2次循环逐次略有增加；破坏加载时，加载初期也存在快速下降阶段。对2种循环加卸载过程中电阻率变化规律采用循环加载下微裂隙闭合机制进行了解释。试验研究表明，电阻率变化可以较好地表征单轴等幅循环加卸载和分级循环加卸载过程中试件内微裂隙发展情况。

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	宋杰
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	聂利超
	李铭
	梅洁

关键词 ：岩石力学, 等幅循环加卸载, 分级循环加卸载, 电阻率

Abstract：

Constant amplitude cyclic loading and unloading and tiered cyclic loading and unloading have some same rules. The difference is that when complete unloaded(loading is 0 kN) and fully loaded(loading is 35 kN in the first level of fully loading) at the first three cycles the resistivity is uccessive to decrease, while at the latter two cycles increases slightly. In the process of destructiveness loading，it also exists a fast falling period at the beginning of loading. An explanation for resistivity change rule of the two process of cyclic loading at same time by using mechanism of microfissuring closure under cyclic loading is given. Experimental research shows that rock resistivity change can provide a good characterization to microfissuring development situation in rock in the process of constant amplitude cyclic loading and unloading and tiered cyclic loading and unloading.

Key words： rock mechanics constant amplitude cyclic loading and unloading tiered cyclic loading and unloading resistivity

引用本文:

宋杰，李术才，刘斌，杨磊，许新骥，聂利超，李铭，梅洁. 灰岩岩样等幅和分级循环加卸载过程中电阻率响应规律研究[J]. 岩石力学与工程学报, 2015, 34(S2): 3880-3887.
SONG Jie，LI Shucai，LIU Bin，YANG Lei，XU Xinji，NIE Lichao，LI Ming，MEI Jie. STUDY ON RESISTIVITY RESPONSE LAW OF LIMESTONE IN PROCESSES OF CONSTANT AMPLITUDE AND TIERED CYCLIC LOADING AND UNLOADING. , 2015, 34(S2): 3880-3887.

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https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2014.1718 或 https://rockmech.whrsm.ac.cn/CN/Y2015/V34/IS2/3880

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