圆形孔洞结构岩体冲击响应识别实验模拟研究

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摘要孔洞是地质和岩石工程中常见的结构，为了模拟孔洞结构岩体在高速冲击荷载下的响应特征，设计和加工了孔洞结构的花岗岩体试样，采用改进的冲击动力学测试模拟系统，在不同冲击能下，在垂直和平行孔洞轴线方向对孔洞结构花岗岩体进行渐进式循环冲击模拟试验，对实验杆入/反射应力波进行测量。研究表明，峰值反射应力比与冲击能大小无关，但反射应变比能比随冲击能的增大而降低；在低冲击能下，孔洞结构对反射应力波的响应影响不大；随着冲击能的增大，其影响增大；岩体沿孔洞结构的轴线方向发生开裂破坏，与冲击位置无关；在试样开裂后，应变比能显著增高但峰值应力比的变化不大，说明应变比能比可作为岩体结构破坏指示的响应指标。模拟实验为孔洞类岩石结构的钻进识别以及防护设计提供了理论依据。

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	谭卓英
	武斌
	夏志远
	丁宇
	齐宽
	李文
	岳鹏君

关键词 ：花岗岩, 洞室结构, 冲击能, 应变比能, 响应识别

Abstract：Cavities are a usual structure in natural geology and rock engineering.In order to simulate the response characteristics of rock mass with an opening circular hole structure under high speed impact loading, granite samples with tunnel-like structure were designed and processed.An improved impact dynamics simulation test system was employed to measure the stress wave in experimental bar for the structural rock samples at the different positions parallel and perpendicular to the axis of the cavity under progressive cycle impact loads.The results show that peak reflected stress ratio is independent of the impact energy; however, specific reflected strain energy decreases with the impact energy.The void structure has little effect on the response of reflected stress wave under low impact energy.With the increase of impact energy, the influence of the void structure on the response increases.The ratio of specific strain energy but not the peak stress ratio significantly increases after the rock samples were spalled.The impact failure of rock occurs along the axis of the tunnel-like structure and is independent of the loading points.It indicates specific strain energy ratio may be proposed to be the response indicator of rock cavity structure failure, which provides the theoretical basis for identification of a cavern structure as well as its protection while drilling.

Key words： granite cavern structure impact energy specific strain energy response identification

收稿日期: 2018-05-03 出版日期: 2020-02-15

引用本文:

谭卓英，武斌，夏志远，丁宇，齐宽，李文，岳鹏君. 圆形孔洞结构岩体冲击响应识别实验模拟研究[J]. 振动与冲击, 2020, 39(4): 136-141.
TAN Zhuoying，WU Bin，XIA Zhiyuan，DING Yu，QI Kuan，LI Wen，YUE Pengjun. Experimental simulation of impact response identification on circular hole cavern rock mass. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(4): 136-141.

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http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2020/V39/I4/136

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