1地形地貌geographicandgeomorphic工程地质条件engineeringgeologicalconditions地形地貌条件geographicandgeomorphicconditions地形landform地貌geomorphology,relief微地貌microrelief地貌单元landformunit,geomorphicunit坡度grade地形图reliefmap河谷rivervalley河道rivercourse河床riverbed(channel)冲沟gully,gulley,erosiongully,stream(brook)河漫滩floodplain(valleyflat)阶地terrace冲积平原alluvialplain三角洲delta古河道fossilrivercourse,fossilstreamchannel冲积扇alluvialfan洪积扇diluvialfan坡积裙talusapron分水岭divide盆地basin岩溶地貌karstlandfeature,karstlandform溶洞solutioncave,karstcave落水洞sinkhole土洞Karsticearthcave2地层岩性地层geostrome(stratum,strata)岩性lithologiccharacter,rockproperty岩体rockmass岩层bedstratum岩层layer,rockstratum母岩matrix,parentrock相变facieschange硬质岩strongrock,film软质岩weakrock硬质的competent软质的incompetent基岩bedrock岩组petrofabric覆盖层overburden交错层理crossbedding层面beddingplane片理schistosi