节理对爆生裂纹扩展影响的试验研究

PDF(1209 KB)

振动与冲击 ›› 2017, Vol. 36 ›› Issue (10) : 26-30.

论文

节理对爆生裂纹扩展影响的试验研究

杨仁树1,2，丁晨曦1，杨立云1，王雁冰1，许鹏1

作者信息 +

Experimental study on the effects of joints on blasting induced cracks propagation

YANG Ren-shu1,2，DING Chen-xi1，YANG Li-yun1，WANG Yanbing1，XU Peng1

Author information +

文章历史 +

摘要

采用模型试验方法，结合新型数字激光动态焦散线试验系统，比较了不同炮孔与节理间距下节理处起裂的动态行为，研究了节理对爆生裂纹扩展的影响。结果表明：由于节理结构的细观差异，试件的破坏形态表现出多样性。根据节理处起裂时段的差异，节理处起裂形式有2种，形式Ⅰ：在爆生裂纹扩展至节理之后，节理处起裂并扩展；该种起裂形式下，爆生裂纹对节理的直接作用是节理处起裂的主要原因，炮孔到节理的距离对节理处起裂裂纹的偏移距离影响不大。形式Ⅱ：在爆生裂纹扩展至节理之前，节理处已经起裂并扩展；该种起裂形式下，爆炸应力波对节理的作用是节理处起裂的主要原因。节理处裂纹的整体偏移范围由这两种起裂形式决定。试件的不同破坏形态在裂纹扩展的应力特征上表现出差异性和复杂性。

Abstract

Using model test method combined with new digital laser dynamic caustics experimental system(DLDC), the dynamic behaviors of crack initiation at joints were compared in condition of different intervals between boreholes and joints, the effects of joints on blasting induced cracks propagation were studied. It showed that the failure forms of test specimens were various duo to mesoscopic differences of joint structure. There were two forms of crack initiation at joints according to different crack initiation time situations, Form 1: Crack at the joint did not initiate until the blasting induced crack reaching to the joint; in this form, the direct action of blasting induced cracks on joints was primary cause of crack initiation at joints, the offset distance of crack which initiated at the joint had little to do with the distance between borehole and joint in such form. Form 2: Crack at the joint had already initiated and propagated before the blasting induced crack reaching to the joint; in this form, the action of blasting stress waves on joints was primary cause. The overall scope of crack offset distance at the joint was determined by these two forms. Different failures of specimens showed various discrepancies and complexities in the aspect of crack stress characteristics.

导出引用

杨仁树1,2，丁晨曦1，杨立云1，王雁冰1，许鹏1. 节理对爆生裂纹扩展影响的试验研究[J]. 振动与冲击, 2017, 36(10): 26-30

YANG Ren-shu1,2，DING Chen-xi1，YANG Li-yun1，WANG Yanbing1，XU Peng1. Experimental study on the effects of joints on blasting induced cracks propagation[J]. Journal of Vibration and Shock, 2017, 36(10): 26-30

参考文献

[1] Li J C, Ma G W. Analysis of blast wave interaction with a rock joint[J]. Rock Mechanics and Rock Engineering, 2010, 43(6SI): 777-787.
[2] Liu H Y, Lv S R, Zhang L M, et al. A dynamic damage constitutive model for a rock mass with persistent joints[J]. International Journal of Rock Mechanics and Mining Sciences, 2015,75: 132-139.
[3] 张力民，吕淑然，刘红岩. 综合考虑宏细观缺陷的岩体动态损伤本构模型[J]. 爆炸与冲击,2015, 35(3): 428-436.
Zhang Li-min, Lv Shu-ran, Liu Hong-yan. A dynamic damage constitutive model of rock mass by comprehensively considering macroscopic and mesoscopic flaws[J]. Explosion and Shock Waves, 2015, 35(3): 428-436.
[4] Borbely D, Megyeri T, Goeroeg P. Significance of joint pattern on modelling of a drill and blast tunnel in crystalline rock[Z]. Lollino G, Giordan D, Thuro K, et al. 2015，905-908.
[5] 朱亮，陈明，卢文波，等. 轮廓爆破下柱状节理岩体开裂过程的数值模拟[J]. 爆炸与冲击. 2015, 35(4): 555-560.
Zhu Liang, Chen Ming, Lu Wen-bo, et al. Numerical simulation on the cracking process of columnar jointed rock masses in contour blasting[J]. Explosion and Shock Waves, 2015, 35(4): 555-560.
[6] 宋全杰，李海波，李俊如，等．层理对爆破振动传播规律的影响[J]．岩石力学与工程学报，2012，31(10)：2103-2108
Song Quan-jie，Li Hai-bo，Li Jun-ru，et al．Influence of stratification on attenuation law of blasting vibration[J]．Chinese Journal of Mechanics and Engineering，2012，31(10)：2103-2108．
[7] 刘际飞，璩世杰. 节理走向角度对爆炸应力波传播影响的试验研究[J]. 爆破, 2014,31(02): 57-61.
Liu Ji-fei，Qu Shi-jie. Experimental study of influence of joint angle of strike on explosive stress wave propagation[J]. Blasting, 2014,31(02): 57-61.
[8] Sagong M, Park D, Yoo J, et al. Experimental and numerical analyses of an opening in a jointed rock mass under biaxial compression[J]. International Journal of Rock Mechanics and Mining Sciences. 2011, 48(7): 1055-1067.
[9] 杨仁树，桂来保．焦散线方法及应用[M]．徐州：中国矿业大学出版社，1997．
Yang Renshu，Gui Laibao．The caustics method and application[M]．Xuzhou：China University of Mining & Technology Press，1997．
[10] 姚学锋，方竞，熊春阳．爆炸应力波作用下裂纹与孔洞的动态焦散线分析[J]．爆炸与冲击，1998,18(3):232-236.
Yao Xue-feng，Fang Jing，Xiong Chun-yang．Dynamic caustics analysis of cracks and holes subjected to explosion stress wave[J]．Explosion and Impact，1998，18(3)：232-236．
[11] 杨仁树，杨立云，岳中文，等．爆炸载荷下缺陷介质裂纹扩展的动焦散试验[J]．煤炭学报，2009，34(2)： 187-192．
Yang Ren-shu，Yang Li-yun，Yue Zhong-wen，et al．Dynamic caustics experiment of crack propagation in material containing flaws under blasting load[J]．Journal of China Coal Society，2009，34(2)： 187-192．
[12] Yue Z W, Yang L Y, Wang Y B. Experimental study of crack propagation in polymethyl methacrylate material with double holes under the directional controlled blasting[J]. Fatigue Fracture Engineering Material Structure, 2013, 36, 827–833.
[13] Murphy N, Ali M, Ivankovic A. Dynamic crack bifurcation in PMMA[J]. Engineering Fracture Mechanics, 2006,73(16):2569-2587.
[14] 刘承, 苏先基. 裂纹扩展速度对焦散线的影响和动态应力光学常数的测定[J]. 实验力学, 1988，3(2)：109-118.
Liu Cheng, Su Xianji. On the caustics influenced by the crack propagating speed and determination of the dynamic stress optical constants[J]. Journal of Experimental Mechanics, 1988, 3(2)：109-118.
[15] 杨立云，杨仁树，许鹏．新型数字激光动态焦散线实验系统及其应用[J]．中国矿业大学学报，2013，42(2)：188-194．
Yang Li-yun，Yang Ren-shu，Xu Peng．Caustics method combined with laser & digital high-speed camera and its applications[J]．Journal of China University of Mining & Technology，2013，42(2)：188-194．
[16] Theocaris P S. Dynamic propagation and arrest measurements by method of caustics on overlapping kewparallel cracks[J]．International Journal of Solid and Structures，1978(14):639-653．
[17] 李清,张迪,杨阳,等含单侧预制裂纹梁的冲击动态断裂过程试验研究[J]．振动与冲击，2015，34(4):205-210．
Li Qing，Zhang Di，Yang Yang，et al．Dynamic fracture tests for a beam containing unilateral pre-existing cracks under impact loads[J]．Journal of Vibration and Shock，2015, 34(4):205-210.