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Study on the Closure Deformation Properties of Joint Fractal under SHPB Load

WANG Weihua,LI Kun,YAN Zhe,TANG Xiu   

  1. School of Resources and Safety Engineering,Central South University,Changsha    410083,Hunan,China
  • Received:2015-12-22 Revised:2016-06-23 Online:2017-02-28 Published:2017-05-12

Abstract:

In order to investigate the properties of joint closure deformation under dynamic loading,artificial specimens with joints are produced by using cement mortar,then,the impact test is carried out on joint specimens with different fractal dimension(JRC) under different loading rates by means of SHPB,and the dynamic deformation curves of joints with different Barton standard JRC values under different loading rates are obtained.Analysis of specimens and their results after impact test shows:With the increasing of loading rate,the number of fragmentation is increasing significantly,showing a strong correlation between number and the rate of loading;the change trend of joint closure deformation curve is not affected by loading rate;δ is increasing with the increasing of σ.Under the circumstance of same loading rate,there is a great difference about normal deformation among specimens with different joint morphology;the deformation curves of the specimens with the same joint under different loading rates are also different.No matter how fast the loading rate,there is a strong index relationship between δ and σ,which can be expressed in a unified formula.It provides the experimental basis for the further study of the constitutive equations of joint closure deformation under dynamic loading.

Key words: SHPB, joint fractal, joint closure deformation, dynamic load

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