seasonally frozen ground

基本解释

In seasonally frozen ground regions as well as permafrost regions, active layer is the most active terrane in terms of thermodynamics.
活动层夏季融化、冬季冻结的近地表土（岩）层，是冻土地区热力动态最活跃的岩层，在冻土研究中有着重要意义。
It is shown from the results that seasonally frozen ground evidently influences site dynamical characteristics and seismic security of tank.
结果表明：季节性冻土层的存在明显地影响着场地动力特性，进而影响储罐的抗震安全性。
Water migration and variation in subgrade soils is the most active and live factor to the road frost damage in seasonally frozen ground regions.
在季节冻土区，路基水分迁移变化是道路冻害最积极活跃的因素。