- Title
- Energy Evolution Characteristics and Weak Structure-"Energy Flow" Impact Damaged Mechanism of Deep-Bedded Sandstone
- Creator
- Song, Zhixiang; Zhang, Junwen; Wang, Shanyong; Dong, Xukai; Zhang, Yang
- Relation
- Rock Mechanics and Rock Engineering Vol. 56, p. 2017-2047
- Publisher Link
- http://dx.doi.org/10.1007/s00603-022-03150-w
- Publisher
- Springer
- Resource Type
- journal article
- Date
- 2023
- Description
- The whole life cycle evolution process of roadway surrounding rocks of deep mines is the energy competition evolution process. Therefore, a “three-stage” stress path was proposed to obtain the energy evolution characteristics and impact damage mechanism of deep-bedded sandstone. Meanwhile, conventional triaxial loading and “three-stage” triaxial loading and unloading mechanical tests of deep-bedded sandstone with various bedding angles were conducted. The results show that: (1) within β ∈ (30°, 45°), the decay rate of the peak strength in the two stress paths was significant, (2) the failure degree of deep-bedded sandstone under “three-stage” loading and unloading condition (TLUT) was weak failure, but that under conventional triaxial loading condition (CTLT) was medium failure and strong failure, and the proportion of medium failure degree was relatively high, (3) there was a significant linear relationship among the peak elastic energy, peak strength, and peak strain; in addition, the linear energy storage law of rocks from the perspective of triaxial conditions was verified, (4) the accumulated energy in the tips of the weakest structural plane corresponding to the high stress concentration zone or high state gradient zone continuously impacted the low state gradient zone in terms of the “Energy Flow”. Subsequently, the weakest structure plane was gradually and continuously expanded, and extension and connection accumulated and eventually resulted in failure. The obtained conclusions provide a theoretical basis for the stability control of deep roadways and the prevention and control of rock burst.
- Subject
- deep-bedded sandstone; energy anisotropy; failure strength factor; failure degree; weak structure; "energy flow"
- Identifier
- http://hdl.handle.net/1959.13/1487312
- Identifier
- uon:52114
- Identifier
- ISSN:0723-2632
- Language
- eng
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