静态预应力条件作用下岩板动态破坏行为试验研究

doi:10.13722/j.cnki.jrme.2016.1278

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Abstract 深部岩石的动力破坏，是岩石力学研究的一个热点问题。为模拟深部岩石动态断裂情况，选取一种花岗岩制备带10 mm预制裂纹的板状试样，开展含预应力条件下的岩板动态破坏行为研究。试件尺寸为305 mm×305 mm×10.5 mm岩板，在静态竖向预压的条件下，使用25 mm杆径的霍普金森压杆进行冲击试验。利用超高速摄影仪记录试样裂纹扩展的全过程，采用数字图像相关(DIC)技术分析试样的位移场及应变场，通过设置虚拟引伸计，获得预应力条件下岩板起裂时刻、裂纹长度、裂纹扩展速度及断裂韧性等动态断裂力学参量。研究结果显示：该岩板试件裂纹扩展速度可达到瑞利波速的0.57倍(～1000 m/s)，验证了采用花岗岩岩板测试的优势。在特定预应力条件下，岩板的裂纹扩展速率与动态断裂韧性具有明显的率相关性；特定冲击速度条件下，随着静态预应力的增加，裂纹扩展速度受到抑制，破坏模式由单一裂纹扩展向多条微裂纹扩展等复杂模式转变，甚至出现止裂现象。当气枪冲击气压103.43 kPa、静态预应力30 MPa时，裂纹扩展速度降为452.4 m/s，属于低速裂纹扩展范围。

Key words：岩石力学预应力裂纹扩展数字图像相关岩板

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	Articles by authors
	XIA Kaiwen1
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	XU Ying1
	YAO Wei1
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	GAO Guiyun3

Cite this article:

XIA Kaiwen1,2,XU Ying1, et al. Experimental study of dynamic fracture behavior of brittle rock plate under static pre-loading[J]. , 2017, 36(5): 1122-1132.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2016.1278 OR http://www.rockmech.org/EN/Y2017/V36/I5/1122

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