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摘要: 通过室内爆炸压裂模拟实验,得到常压和20MPa围压2种情况下的爆炸压裂效果,并对实验结果 进行了对比分析,分析结果表明:围压对裂纹扩展路径、形状、弯曲度都有一定影响,与常压下的裂纹扩展情况 相比,施加围压后得到的裂纹数量少、长度短、弯曲明显。在对爆炸压裂形成的裂纹进行定性描述的基础上, 利用分形理论,对裂纹的分形特征进行了描述,并对裂纹的分形维数进行了求解。结果表明:同一实验条件、 同一试样表面形成的裂纹,分形维数也不完全相同,围压条件下形成的裂纹维数高于常压下的裂纹维数。Abstract: Indoorexplosivefracturingsimulationtestswerecarriedoutatatmosphericpressureand20 MPaconfiningpressure,respectively.Theobtainedexplosivefracturingeffectswerecompared.Comparisonsshowthatconfiningpressurehasacertaininfluenceoncrackpropagationpath, crackshape andcrackcurvature;andthatthenumberofcracksinducedbyexplosivefracturingat20MPaconfiningpressureisless, thelengthisshorterandthecurvatureisclearerthanthosegeneratedatatmosphericpressure. Thefractalpropertiesofthecracksweredescribedbythefractaltheoryandthefractaldimensionsofthosecrackswerederived. Resultsdisplaythatunderthesametestconditions,the fractaldimensionsofthecracksatthesurfaceofthesamecementsamplearenotcompletelythesame witheachother,andthatthefractaldimensionofthecracksat20 MPaconfiningpressureishigher thanthosegeneratedatatmosphericpressure.
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Key words:
- mechanicsofexplosion /
- fractalevaluation /
- confiningpressure /
- explosivefracturing /
- cement
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