基于声发射时空演化的岩石全应力–应变曲线阶段特征分析

doi:10.13722/j.cnki.jrme.2018.0594

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Abstract

It is important to understand the stage division and its AE characteristics during rock deformation process. This helps when making prediction about the rock¢s stress state. With an example of siltstone，the AE characteristics for each of seven stages of the whole stress-strain curve were given in this paper. AE characteristics applied for this purpose were combined by three aspects. They are curves of AE events accumulation vs. time，AE frequency distribution scattering vs. time and AE events locations in rock space by stages. For convenience to making more accurate descriptions of AE temporal-spatial evolution，some definitions of typical characteristics for the above three AE aspects were given firstly. According to their geometric form, the AE characteristics were described as AE platform，AE multistep upward，band of major frequency，cutting frequency，intensive gathering，etc.. Secondly, experiments of monitoring and 3D location of acoustic emission(AE) were carried out on siltstone during its deformation under uniaxial compression. It is investigated temporal-spatial evolution characteristics of AE in each stage of the process. It was found to be identifiable for each of the seven stages by application of the three combining AE properties. Upon meso-mechanical analysis，the comprehensive evolution state of AE may be greatly influenced by fracturing mechanism. This mechanism is determined by local stress state in rock and sizes and azimuth of the original fissures therein. Similar to process of elastic rebound in earthquake，the process of shear localization in rock was formed by AE events gathering around micro structure therein during the softening stage(the 4th stage). This leads to stress drop with major fracturing in rock. Then more AEs were triggered by meso-fracturing process with release of strain energy during elastic rebound. Thus the combining three AE properties in the 4th stage，i.e. AE platform，AE multistep upward，band of major frequency in a line shape with cutting frequencies，AE intensive gathering in several zones of rock space，would be taken as precursors prior to rock failure. Finally，the three combining AE properties were compared on other three different kinds of rocks. It was concluded that AE properties were controlled by triggering process of ultrasonic with meso-fracturing. The harder and bigger the mineral particles，stronger cementation between them，and more micro structures distributed in rock homogeneously，the more AE events，more frequency bands and cutting frequencies produce. Therefore，it is necessary to investigate systematically influences of meso-fracturing by rock¢s micro structure when applying AE properties to monitoring and indentifying stress state of rock during its loading process.

Key words： rock mechanics rock failure acoustic emission whole stress-strain curve frequency meso-mechanism

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	Articles by authors
	DENG Xubiao
	LIU Yuanzheng
	XING Kuang
	YU Huaichang

Cite this article:

DENG Xubiao,LIU Yuanzheng,XING Kuang, et al. Analysis based on AE space-time evolution characteristics for stage division of whole stress-strain curve of rock[J]. , 2018, 37(S2): 4086-4099.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2018.0594 OR https://rockmech.whrsm.ac.cn/EN/Y2018/V37/IS2/4086

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