不同特征应力区间单裂隙砂岩与完整岩石蠕变特性的相关关系

doi:10.13722/j.cnki.jrme.2021.0809

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Abstract In order to study the relationship between the creep characteristics of fractured hard rock and intact rock，and considering the fact that the creep characteristics of hard rock are quite different under different critical stress intervals，creep tests were carried out on single-flawed sandstones with different crack angles. The test results show that when the loaded stress ?1 is less than the crack initiation stress ?ci，the specimens only show the characteristic of the decay creep stage，and that the difference in creep characteristics of each specimen is mainly due to the different initial damage caused by the crack angles. When ?1 is larger than ?ci，all specimens enter the accelerated creep stage and fail at a certain time，in which the difference in creep characteristics of each specimen is affected not only by the initial damage but also by the time-dependent damage. In view of this，a whole process damage creep model of fractured rock mass is established. When ?1 is less than ?ci，the switch in the model is closed，and the model is only affected by the initial damage. When ?1 is larger than ?ci，the switch is broken and the time-dependent damage body enters work. For the model，the initial damage and the time dependent damage can be calculated by the theory of strain energy and the Kachanov creep damage formula respectively. Both intact and fractured rock masses are applicable to the model with only differences in parameters. Therefore，by first deriving the critical stresses of fractured rock masses from that of intact rock，and then calculating the damage variables under critical stress intervals，the creep model of fractured rock masses can be derived from intact rock. This idea can provide some reference for the study of the damage creep model of fractured rock masses.

Key words： rock mechanics single-flawed sandstone creep characteristics damage variable creep model

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	Articles by authors
	YANG Chao
	XU Xuan
	WANG Lehua
	SUN Qiancheng
	WANG Ruihong

Cite this article:

YANG Chao,XU Xuan,WANG Lehua, et al. Relationship between creep characteristics of intact rock and single-flawed sandstone under different critical stress intervals[J]. , 2022, 41(7): 1347-1357.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0809 OR http://rockmech.whrsm.ac.cn/EN/Y2022/V41/I7/1347

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