Using　a　typical　four-lane　highway　tunnel　as　a　prototype,　we　conducted　static　pushover　tests　on　a　scaled-down　model　to　examine　the　variations　in　ground　displacement,　ground　pressure,　and　ground　cracking　with　pushover　distance.　Compared　with　the　test　results　of　two-lane　tunnel,　the　test　results　indicate　that　the　ground　is　displaced　reversely　from　the　arching　line　and　then　cracked.　Therefore,　the　location　of　fracture　point　should　be　modified　from　the　bottom　of　the　side　wall　to　the　arching　line.　The　test　results　also　show　that　the　ground　slides　smoothly　along　the　tunnel　circumferential　direction　with　a　large　inclination　angle,　so　the　potential　slip　planes　should　be　modified　from　constant　vertical　to　linear　inclination.　According　to　these　test　results,　the　applicability　of　surrounding　ground　pressure　calculation　model　assumption　in　the　four-lane　tunnel　is　discussed,　and　a　modified　ground　pressure　calculation　model　suitable　for　the　four-lane　highway　tunnels　is　proposed.　These　researches　can　provide　experimental　basis　and　technical　support　for　the　seismic　calculation/checking　of　the　four-lane　highway　tunnel,　and　provide　reference　for　further　improvement　of　surrounding　ground　pressure　calculation　model.　©　2024　Biodiversity　Research　Center　Academia　Sinica.　All　rights　reserved.