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Abstract At the tip end of fracture，there is very high stress and dilatancy occurs during hydraulic fracturing. Although the fact is well known in petroleum engineering，the effect of dilatancy is not clear on the rock fracture parameters. Based on the knowledge of mechanism of compression-induced dilatancy，the rock porosity permeability(K)，elastic modulus(E)，fracture length(Xf)，width(wwn) are changed during hydraulic fracturing. The rock mechanics related problems are discussed in detail.
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Received: 01 October 2001
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