Dynamic caustics experiment of crack propagation in material containing flaws under blasting load - 文章详情页

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摘要：

Using　the　dynamic　caustics-test　system,　the　PMMA　(Polymethyl　Methacrylate)　model　transmission-type　experiment　of　dynamic　caustics　was　carried　out　to　simulate　blasting　process　of　rock　containing　flaws.　The　crack　propagation　law　under　blasting　load　of　the　borehole　in　the　same　line　of　the　prefabricated　flaw　was　studied.　The　experimental　results　show　that　two　wing　cracks　appear　at　both　ends　of　the　flaw　in　material　subjected　to　blasting　load.　The　wing　crack　A　length　is　longer　than　wing　crack　B　length.　Two　wing　cracks　expand　along　reverse　direction.　The　crack　velocity　oscillates　with　the　increase　of　crack　length,　and　there　are　several　stages　of　recognized　increasing,　decreasing,　reincreasing　and　redecreasing　regions　during　the　whole　fracture　process.　The　wing　crack　acceleration　presents　the　alternation　with　increasing　and　decreasing.　Dynamic　stress　intensity　factors　also　present　the　wavy　variation　of　quick　increasing　and　gradual　decreasing.　The　maximum　value　of　dynamic　stress　intensity　factor　KId=1.3　MN/m3/2,　and　the　value　of　KId　is　larger　than　KIId　at　all　times.

关键词：

Blasting load; Crack propagation regularity; Dynamic caustics; Material containing flaws; Stress intensity factor

作者机构：

[ 1 ] [Yang, R.-S.]School of Mechanics and Civil Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
[ 2 ] [Yang, R.-S.]State Key Laboratory of Coal Resources and Mine Safety, China University of Mining and Technology (Beijing), Beijing 100083, China
[ 3 ] [Yang, L.-Y.]School of Mechanics and Civil Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
[ 4 ] [Yang, L.-Y.]State Key Laboratory of Coal Resources and Mine Safety, China University of Mining and Technology (Beijing), Beijing 100083, China
[ 5 ] [Yue, Z.-W.]School of Mechanics and Civil Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
[ 6 ] [Yue, Z.-W.]State Key Laboratory of Coal Resources and Mine Safety, China University of Mining and Technology (Beijing), Beijing 100083, China
[ 7 ] [Xiao, T.-S.]School of Mechanics and Civil Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
[ 8 ] [Xiao, T.-S.]State Key Laboratory of Coal Resources and Mine Safety, China University of Mining and Technology (Beijing), Beijing 100083, China
[ 9 ] [Dong, J.-C.]School of Mechanics and Civil Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
[ 10 ] [Dong, J.-C.]State Key Laboratory of Coal Resources and Mine Safety, China University of Mining and Technology (Beijing), Beijing 100083, China
[ 11 ] [Niu, X.-C.]Beijing Polytechnic College, Beijing 100042, China

通讯作者信息：

[Yang, R.-S.]School of Mechanics and Civil Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China

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