hardpan

n.

（软土下面的）硬质地层，黏土层，砂砾层；硬盘；

hardpan
hardpan:
Hardpan
HARDPAN IN SOILS OF SEMI‐ARID WESTERN AUSTRALIA
Hardpan and microrelief in certain soil complexes of California
Influence of hardpan layers on arsenic mobility in historical gold mine tailings
A preliminary investigation of hardpan horizons in north-west New South Wales.
Performance of an oscillating subsoiler in breaking a hardpan
Residual effects of slit tillage and subsoiling in a hardpan soil
The effects of hardpan layers on the water chemistry from the leaching of pyrrhotite-rich tailings material
Mobility and retention of trace elements in hardpan-cemented cassiterite tailings, north Queensland, Australia
Geochemistry of calcretes (calcic palaeosols and hardpan), Coimbatore, Southern India: Formation and Paleoenvironment
Mineralogy of the hardpan formation processes in the interface between sulfide-rich sludge and fly ash: Applications for acid mine d...