eralcharacteristicsofmining-inducedhorizontalsheardeformations.ThisShearIndexisderivedbasedonthecomponentofhorizontalmovementsperpendiculartoasurveylineoralineofinterest.Theformulaforderivingthisindexisthesameasthatfortheconventionallydefinedtilt.Physically,thisindexreflectsangularchangesinthehorizontalplanebutitisnotpossibletotellwhatcausessuchchanges,beingeithershearorrigidbodyrotationorboth.However,thedistributionpatternofthisindexcanhelptounderstandthedevelopmentofsheardeformationsandtofind"troublespots"(refertofurtherdiscussionspresentedintheSectionbelow).FURTHERDISCUSSIONSONHORIZONTALSHEARDEFORMATIONSFigureshowsthedistributionpatternofhorizontalmovementsperpendiculartoasurveylineacrossalongwallpanelandthecorrespondingShearIndexasdiscussedabove.AlthoughthesiteislocatedintheHunterCoalfieldwithshallo变形中一个重要组成部分。
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