As　the　intensity　of　urban　underground　space　development　increases,　more　and　more　tunnels　are　planned　and　constructed,　and　sometimes　it　is　inevitable　to　encounter　situations　where　tunnels　have　to　underpass　the　river　embankments.　Most　previous　studies　involved　tunnels　passing　river　embankments　perpendicularly　or　with　large　intersection　angle.　In　this　study,　a　project　case　where　two　EPB　shield　tunnels　with　8.82　m　diameter　run　parallelly　underneath　a　river　embankment　was　reported.　The　parallel　length　is　380　m　and　tunnel　were　mainly　buried　in　the　moderate　/　slightly　weathered　clastic　rock　layer.　The　field　monitoring　result　was　presented　and　discussed.　Three-dimensional　back-analysis　were　then　carried　out　to　gain　a　better　understanding　the　interaction　mechanisms　between　shield　tunnel　and　embankment　and　further　to　predict　the　ultimate　settlement　of　embankment　due　to　twin-tunnel　excavation.　Parametrical　studies　considering　effect　of　tunnel　face　pressure,　tail　grouting　pressure　and　volume　loss　were　also　conducted.　The　measured　embankment　settlement　after　the　single　tunnel　excavation　was　4.53　mm　similar　to　7.43　mm.　Neither　new　crack　on　the　pavement　or　cavity　under　the　roadbed　was　observed.　It　is　found　that　the　more　degree　of　weathering　of　the　rock　around　the　tunnel,　the　greater　the　embankment　settlement　and　wider　the　settlement　trough.　Besides,　the　latter　tunnel　excavation　might　cause　larger　deformation　than　the　former　tunnel　excavation　if　the　mobilized　plastic　zone　overlapped.　With　given　geometry　and　stratigraphic　condition　in　this　study,　the　safety　or　serviceability　of　the　river　embankment　would　hardly　be　affected　since　the　ultimate　settlement　of　the　embankment　after　the　twin-tunnel　excavation　is　within　the　allowable　limit.　Reasonable　tunnel　face　pressure　and　tail　grouting　pressure　can　to　some　extent　suppress　the　settlement　of　the　embankment.　The　recommended　tunnel　face　pressure　and　tail　grouting　pressure　are　300　kPa　and　550　kPa　in　this　study,　respectively.　However,　the　volume　loss　plays　the　crucial　role　in　the　tunnel-embankment　interaction.　Controlling　and　compensating　the　tunneling　induced　volume　loss　is　the　most　effective　measure　for　river　embankment　protection.　Additionally,　reinforcing　the　embankment　with　cement　mixing　pile　in　advance　is　an　alternative　option　in　case　the　predicted　settlement　exceeds　allowable　limit.