At　present,　research　on　XCC　piles　has　mainly　focused　on　clay　foundations;　however,　there　has　been　little　research　on　XCC　piles　in　sand.　In　addition,　the　compaction　effect　of　a　pile　had　been　mainly　analyzed　when　the　penetration　of　the　XCC　pile　was　studied,　while　ignoring　the　key　problem　that　these　compaction　displacement　loads　produce　additional　pile　responses　to　adjacent　existing　piles　in　actual　engineering　constructions.　Therefore,　this　study　adopted　a　Coupled　Eulerian-Lagrangian　(CEL)　large　deformation　numerical　technique　for　establishing　an　integrated　CEL　finite　element　numerical　model　of　an　adjacent　XCC　pile-sand-existing　XCC　pile.　The　numerical　results　were　compared　with　the　measured　data　from　indoor　model　tests,　which　verified　the　feasibility　and　validated　the　CEL　numerical　technique　for　analyzing　adjacent　XCC　pile-soil-existing　XCC　pile　interactions.　Subsequently,　a　series　of　parametric　studies　were　performed　to　explore　the　influences　of　the　penetration　depth,　spacing　between　adjacent　piles　and　existing　piles,　and　boundary　conditions　of　the　existing　pile　head　on　the　lateral　response　of　the　existing　pile.　Finally,　based　on　the　results　of　the　parametric　analysis,　a　set　of　design　charts　that　can　be　used　by　geotechnical　engineers　to　evaluate　the　maximum　lateral　response　of　existing　XCC　piles　caused　by　the　penetration　of　adjacent　XCC　piles　at　the　early　design　stage　were　developed　to　mitigate　the　risks　associated　with　pile　foundation　construction.　©　2024　Chang＇an　University.　All　rights　reserved.