爆炸载荷下I型裂纹动态断裂韧度测试方法初探

doi:10.13722/j.cnki.jrme.2014.0125

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摘要爆破是岩土工程中广泛采用的掘进方法，岩石在爆炸载荷下的断裂特性是岩石动力学的核心问题之一。利用雷管和带裂纹的水泥砂浆试样进行爆破试验研究，采用试验–数值方法确定试样的动态断裂韧度。通过试验得到的应变信号来确定试样承受的荷载及裂纹起裂的时间，将得到的时程曲线输入有限元程序ANSYS，利用1/4节点单元计算裂尖的近场位移，进而使用位移外推法求得试样I型动态断裂应力强度因子的时程曲线。裂纹起裂时刻对应的应力强度因子值即为材料的动态断裂韧度，从而给出了在爆炸载荷下I型裂纹的动态断裂韧度测试新方法。

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关键词 ：岩石力学, I型裂纹, 动态断裂韧度, 爆炸载荷, 测试方法

Abstract：Fragmentation is widely applied in rock excavation，and fracture strength under blasting loads is one of the key issues in rock dynamic study. In this paper，blasting experiments with detonators and cement mortar specimens were conducted. The dynamic toughness was computed with experimental-numerical method. The loading and cracking time was determined by strain signals. The displacement field of crack tip was determined by finite element code ANSYS with 1/4 nodes element，and the loading acting on the borehole was determined according to the loading-time curve obtained from the experiments. Using displacement extrapolation method the curve of dynamic intensity factor KI(t) versus time was obtained. The dynamic toughness was determined by the dynamic intensity factor value at the crack initiation time，then a new test method of dynamic fracture toughness under blasting was proposed.

Key words： rock mechanics mode-I crack dynamic fracture toughness blasting load testing method

引用本文:

徐文涛，朱哲明，曾利刚. 爆炸载荷下I型裂纹动态断裂韧度测试方法初探[J]. 岩石力学与工程学报, 2015, 34(s1): 2773-2782.
XU Wentao，ZHU Zheming，ZENG Ligang. TESTING METHOD STUDY OF MODE-I DYNAMIC FRACTURE TOUGHNESS UNDER BLASTING LOADS. , 2015, 34(s1): 2773-2782.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2014.0125 或 http://www.rockmech.org/CN/Y2015/V34/Is1/2773

[4]	ZHU Z M，MOHANTY B，XIE H. Numerical investigation of blasting-induced crack initiation and propagation in rocks[J]. International Journal of Rock Mechanics and Mining Sciences，2007，44(3)：412-424.
[14]	WALLE E V. Evaluating material properties by dynamic testing[M]. London：ESIS Publication，1996：25-35. " target="_blank">
[15]	RUIZ C，MINES R A W. The Hopkinson pressure bar：an alternative to the instrumented pendulum for Charpy tests[J]. International Journal of Fracture，1985，29(2)：101-109. " target="_blank">
[2]	WITTMANN F H，ROKUGO K，BRÜHWILER E，et al. Fracture energy and strain softening of concrete as determined by means of compact tension specimens[J]. Materials and Structures，1988，21(1)：21-32. " target="_blank">
[13]	Comité Européende Normalisertion. EN 10045.2 Charpyimpact test on metallic materials-method for the verification of impact testing machines[S]. [S.l]：[s.n.]，1992. " target="_blank">
[1]	中华人民共和国国家标准编写组. GB/T 21143—2007 金属材料准静态断裂韧度的统一试验方法[S]. 北京：中国标准出版社，2007.(The National Standards Compilation Group of People?s Republic of China. GB/T 21143—2007 Unified test method for quasi static fracture toughness of metallic materials[S]. Beijing：Standards Press of China，2007.(in Chinese)) " target="_blank">
[3]	满轲. 岩石动态断裂韧性测试方法研究[博士学位论文][D]. 北京：中国矿业大学，2010.(MAN Ke. Testing method on dynamic fracture toughness of rock[Ph. D. Thesis][D]. Beijing：China University of Mining and Technology，2010.(in Chinese)) " target="_blank">
[5]	ZHU Z M，XIE H P，MOHANTY B. Numerical investigation of blasting-induced damage in cylindrical rocks[J]. International Journal of Rock Mechanics and Mining Sciences，2008，45(2)：111-121.
[7]	朱哲明，李元鑫，周志荣，等. 爆炸荷载下缺陷岩体的动态响应[J]. 岩石力学与工程学报，2011，30(6)：1 157-1 167.(ZHU Zheming，LI Yuanxin，ZHOU Zhirong，et al. Dynamic response of defected rock under blasting load[J]. Chinese Journal of Rock Mechanics and Engineering，2011，30(6)：1 157-1 167.(in Chinese))
[8]	ZHU Z M. New biaxial failure criterion for brittle materials in compression[J]. Journal of Engineering Mechanics，1999，125(11)： 1 251-1 258. " target="_blank">
[9]	ZHU Z M. An alternative form of propagation criterion for two collinear cracks under compression[J]. Mathematics and Mechanics of Solids November，2009，14(8)：727-746. " target="_blank">
[11]	许蔚，徐曼琼，姚学锋，等. 正交复合材料I型裂纹动态响应焦散线试验研究[J]. 工程力学，2006，23(3)：173-176.(XU Wei，XU Manqiong，YAO Yuefeng，et al. Experimental study of caustics of Mode-I crack response in orthotropic composites[J]. Engineering Mechanics，2006，23(3)：173-176.(in Chinese))
[19]	范天佑. 断裂动力学引论[M]. 北京：北京理工大学出版社，1990：9-10.(FAN Tianyou. The introduction to dynamic fracture mechanics[M]. Beijing：Beijing Institute of Technology Press，1990：9-10.(in Chinese)) " target="_blank">
[6]	ZHU Z M. Numerical prediction of crater blasting and bench blasting[J]. International Journal of Rock Mechanics and Mining Sciences，2009，46(6)：1 088-1 096. " target="_blank">
[10]	ZHU Z M. Evaluation of the range of horizontal stresses in the earth?s upper crust by using a collinear crack model[J]. Journal of Applied Geophysics，2013，88(1)：114-121. " target="_blank">
[12]	ASTM E 24. Proposed standard methods of test for instrumented impact testing of precracked charpy specimen of metallic materials[S]. [S.l.]：[s.n.]，1981. " target="_blank">
[16]	刘瑞堂，姜风春，刘殿魁. 应力波载荷作用下材料断裂韧性测试技术研究进展[J]. 试验力学，2000，15(2)：137-146.(LIU Ruitang，JIANG Fengchun，LIU Diankui. Advances in the measuring technigue of dynamic fracture toughness under stress wave loading[J]. Journal of Experimental Mechanics，2000，15(2)：137-146.(in Chinese))
[17]	邹广平. 金属材料动态断裂韧度的表征与测试[博士学位论文][D].哈尔滨：哈尔滨工程大学，2005.(ZOU Guangping. Description and test on dynamic fracture toughness in metal materials[Ph.D. thesis][D]. Harbin：Harbin Engineering University，2005.(in Chinese)) " target="_blank">
[18]	邹广平，唱忠良，曲嘉. 平应变下紧凑拉伸试样的动态断裂韧性的试验研究[J]. 试验力学，2011，26(3)：240-246.(ZOU Guangping，CHANG Zhongliang，QU Jia，et al. Experimental study of dynamic fracture toughness of specimen subjected to compact tension under plane strain[J]. Journal of Experimental Mechanics，2011，26(3)：240-246.(in Chinese)) " target="_blank">