真三轴卸载–动力扰动下自然与饱水砂岩破坏特性试验研究

doi:10.13722/j.cnki.jrme.2022.0040

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Abstract 为探讨不同含水状态红砂岩试样在动静组合状态下的失稳破裂特征，采用QKX-YB200真三轴岩爆试验系统、声发射监测系统以及高速摄像仪对自然和饱水状态下的红砂岩立方体试样开展真三轴卸载–动力扰动试验。研究结果表明：在真三轴卸载–动力扰动条件下，自然状态砂岩破坏模式为张拉–剪切混合型破坏，而饱水状态砂岩的破坏模式为张拉型破坏，不同含水状态砂岩的裂纹扩展程度与初始轴向静应力和动力扰动频率密切相关；相比于饱水状态砂岩，自然状态砂岩试样在动力扰动阶段出现了不同程度的块片弹射和飞溅现象，体现为典型的应变型岩爆特征；轴向静应力以及动力扰动频率对于不同含水状态砂岩的力学响应特征具有显著的差异性，其对于自然状态砂岩的力学响应主要体现为岩样的破坏剧烈程度，而对于饱水状态砂岩的力学响应则主要体现为岩样的破碎程度；对含水砂岩试样建立了真三轴卸载–动力扰动下裂纹扩展模型，认为水楔效应、中间主应力效应以及开挖卸荷效应是诱发饱水砂岩产生张拉型破坏的本质原因；基于室内试验结果，从能量转化、力学、物理以及化学的角度初步揭示了真三轴卸载–动力扰动下水弱化岩爆机制。

Key words：岩石力学真三轴卸载动力扰动饱水破裂特征声发射岩爆弱化机制

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	FENG Fan1
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	CHEN Shaojie1
	WANG Qi2
	ROSTAMI J4
	KHORESHOK A A5
	SHENG Shouqian1
	BIAN Zhuang1
	DING Yisong1

Cite this article:

FENG Fan1,2,3, et al. Experimental study on failure characteristics of natural and saturated sandstone under true triaxial unloading and dynamic disturbance condition[J]. , 2022, 41(11): 2240-2253.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.0040 OR http://rockmech.whrsm.ac.cn/EN/Y2022/V41/I11/2240

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