Freeze-thaw　processes　can　cause　slope　instability　in　areas　with　short-term　frozen　(STF)　soil,　resulting　in　potential　safety　risks　and　huge　financial　losses　to　a　certain　extent,　as　these　processes　affect　the　physical　and　mechanical　properties　of　the　soil.　However,　their　adverse　effect　on　the　mesoscopic-level　mechanical　properties　of　residual　soil　has　not　been　adequately　investigated.　To　gain　an　effective　understanding　in　this　regard,　a　laminated-wall　approach　was　adopted　to　create　a　flexible　boundary　for　a　triaxial-shear　test.　Simulated　stress-strain　curves　closely　matched　experimental　results,　with　a　maximum　relative　error　of　7.81%　at　the　peak.　Moreover,　the　experimental　data　collected　from　real　soil　subjected　to　freeze-thaw　cycles　were　used　to　calibrate　the　relation　between　the　macroscopic　and　mesoscopic　parameters.　The　deterioration　of　the　macromechanical　and　micromechanical　parameters　of　residual　soil　primarily　occurred　in　the　first　four　freeze-thaw　cycles.　For　eight　freeze-thaw　cycles,　the　damage　degree　of　each　microparameter　remained　the　same,　reaching　approximately　0.37.　A　freeze-thaw　damage　model　of　the　mesoscopic　parameters　of　residual　soil　was　then　constructed　through　parameter　fitting.　Using　this　model,　the　impact　of　frost-thaw　on　slope　deformation　behaviors　was　analyzed.　A　simulation　revealed　that　displacement　primarily　occurred　at　the　slope　toe　and　the　area　of　influence　expanded　with　an　increasing　number　of　freeze-thaw　cycles.　As　freeze-thaw　cycles　increased,　the　stress　distribution　in　the　X-direction　along　the　top　and　surface　of　a　slope　became　more　concentrated,　impacting　mesoscopic　parameters.　Conversely,　the　stress　in　the　Z-direction　on　the　slope　dispersed　across　three　slopes　after　four　to　eight　freeze-thaw　cycles,　with　considerable　influence　during　the　initial　four　cycles.　The　flexible　boundary　created　using　the　laminated-wall　approach　and　the　freeze-thaw　damage　model　of　the　mesoscopic　parameters　facilitated　an　effective　understanding　of　the　freeze-thaw　effect　on　residual　soil　obtained　from　an　STF　area.　©　2024　American　Society　of　Civil　Engineers.