绢云母石英片岩和砂岩的SHPB试验研究

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Abstract By using the hydraulic and servo-controlled pressure testing machine and the split Hopkinson pressure bar(SHPB) testing apparatus of 100 mm in diameter，which is improved by pulse shaping technique，the experimental tests of sericite-quartz schist and sandstone with strain rate varying from 50–160 s－1 under shock compression loading are carried out to study the quasi-static mechanical properties and relationship among wavy curves，dynamic compressive strength，specific energy absorption and strain rate effect of fracture forms of the two rocks. The experimental results show that the dynamic compressive strength，specific energy absorption and fracture forms of sericite-quartz schist and sandstone have significant correlation with strain rate. However，there is no significant correlation with strain rate can be seen for elastic moduli of the two rocks. The dynamic mechanical comparison results of sericite-quartz schist and sandstone show that sandstone is more sensitive to strain rate than sericite-quartz schist. In the sight of microstructure characteristics and energy absorption of sericite-quartz schist and sandstone，dynamic fracture process is analyzed；and crucial factors influencing the characteristics of fracture are discussed. The research method and conclusions can provide references for analyzing dynamic mechanical behavior of other kinds of brittle materials.

Key words： rock mechanics sericite-quartz schist sandstone large-diameter split Hopkinson pressure bar(SHPB) testing apparatus strain rate

Received: 08 April 2011

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http://www.rockmech.org/EN/Y2011/V30/I9/1864

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