基于弹性能演化全过程的岩石脆性评价方法

doi:10.13722/j.cnki.jrme.2019.0778

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摘要脆性破坏是岩石的一项重要力学特性，建立准确的脆性评价方法对岩石工程具有重要意义。岩石峰前存储的弹性能演化特点直接决定了峰后的脆性破坏特征。因此，综合考虑峰前弹性能的积聚特性和峰后弹性能的释放特性，建立一种基于弹性能演化全过程的岩石脆性评价指标。利用该脆性评价指标开展不同岩性单轴压缩、不同围岩以及水压试验的脆性特征评价。试验结果表明：建立的脆性评价指标能全面反映岩石脆性特征。在单轴试验条件下，该指标能准确地评价各类岩石的脆性差异性；常规三轴压缩条件下，大理岩和石英砂岩的峰前弹性能的积聚率和峰后弹性能耗散率随着围压的增加而不断降低；水压条件下，石英砂岩的脆性指数随着水压的增加而不断提高，随着围压的增加，水压对脆性指标的影响逐渐减弱。试验结果验证了该指标的合理性，研究结果丰富了岩石脆性评价方法。

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	陈国庆1
	吴家尘1
	蒋万增1
	李邵军2
	乔志斌3
	杨文斌3

关键词 ：岩石力学, 岩石脆性评价, 能量演化, 峰前弹性能积聚率, 峰后弹性能耗散率

Abstract：Brittle failure is an important mechanical behavior of rocks，and hence，it is of great significance to establish an accurate brittle evaluation method for rock engineering. Due to that the evolution characteristics of the elastic energy stored in rock before the peak directly determine the property of brittle failure after the peak，in this paper，a brittleness evaluation index based on the whole process of elastic energy evolution was proposed by comprehensively considering the characteristics of pre-peak elastic energy accumulating and post-peak elastic energy releasing. The brittleness evaluation index was used to evaluate the brittleness characteristics of different rocks under uniaxial compression，conventional triaxial compression and hydrostatic pressure conditions. The results show that the brittleness evaluation index established in this paper can fully reflect the brittleness characteristics of rocks. This index can accurately evaluate the difference of brittle characteristics of all kinds of rocks under the condition of uniaxial compression. The accumulating rate of the pre-peak elastic energy and the dissipating rate of the post-peak elastic energy of marble and quartz sandstone decrease with increasing of the confining pressure under the condition of conventional triaxial compression. It is also shown that the brittleness index of quartz sandstone increases with increasing the water pressure and the influence of the water pressure on brittleness index decreases gradually with rising the confining pressure. The rationality of the index was verified by the experimental results. The research work enriches the evaluation method of rock brittleness.

Key words： rock mechanics')" href="#">

rock mechanics rock brittleness evaluation energy evolution pre-peak elastic energy accumulating rate ')" href="#">post-peak elastic energy-releasing rate

引用本文:

陈国庆1，吴家尘1，蒋万增1，李邵军2，乔志斌3，杨文斌3. 基于弹性能演化全过程的岩石脆性评价方法[J]. 岩石力学与工程学报, 2020, 39(5): 901-911.
CHEN Guoqing1，WU Jiachen1，JIANG Wanzeng1，LI Shaojun2，QIAO Zhibin3，YANG Wenbin3. An evaluation method of rock brittleness based on the whole process of elastic energy evolution#br#. , 2020, 39(5): 901-911.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2019.0778 或 http://rockmech.whrsm.ac.cn/CN/Y2020/V39/I5/901

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