Voids　behind　linings　are　a　typical　problem　in　the　majority　of　operational　tunnels.　Previous　researches　had　pointed　out　a　high　correlation　between　the　voids　and　tunnel　damages.　However,　mainly　single　tunnels　have　been　investigated　so　far.　In　fact,　few　studies　focused　on　the　cracking　performance　of　asymmetric　double-arch　tunnels　originating　from　the　relative　radial　displacements　around　the　void.　Herein,　by　combining　numerical　simulation　and　model　test,　the　real　three-dimensional　response　of　the　asymmetric　double-arch　tunnel　structures　caused　by　the　voids　is　reproduced.　Results　reveal　that　crack　patterns　around　the　void　can　be　classified　into　three　main　types.　Transverse　cracks　are　clearly　the　typical　cracks　and　the　spatial　distributions　are　closely　associated　with　void　dimensions.　Moreover,　the　localized　voids　imply　uneven　earth　pressure　distribution　near　the　void,　producing　an　asymmetric　radial　relative　displacement　and　local　bidirectional　internal　forces.　It　is　found　that　the　axial　force　is　much　higher　in　the　circumferential　direction　in　comparison　with　the　longitudinal　force.　Consequently,　the　longitudinal　bending　moment　plays　a　decisive　role　in　the　cracking　performance,　and　the　tensile　stress　in　longitudinal　direction　becomes　higher,　changing　the　usual　mechanism　of　cracking　of　the　linings.　For　the　tunnel　opposite　to　the　voids,　a　slight　growth　of　the　earth　pressure　is　observed　at　the　connection　between　the　vault　and　the　middle　wall,　accelerating　the　overall　cracking　of　the　linings.