摘要
考察发现本区有冻疱型空心穹窿式冻胀丘和烛状冰型冻胀丘。前者结构上分为5层:表层腐殖质土层、穹窿式块冰层、穹窿式空洞、松散砾石层和含粒状冰冻土层。后者结构上分为4层:表层腐殖质土层、烛状冰层、块冰层和含粒状冰冻土层。观测表明,此两类均属季节性冻胀丘。在分析形成机制的基础上认为冬季冷波传递、活动层中地下水冻结后的静水压力和较浅的、缓慢的渗滤层以及地表面细粒土质是本区季节冻胀丘发育的先决条件。
Frost heaving mounds of hollow-domelike frost blister type and candle ice type were found in this area. The former can be divided into 5 layers, namely, surface humus soil, domelike massive ice, empty dome loose debris as well as permafrost layer with particulate ice , and the latter can be divided into 4 layers, namely, surface humus soil, candle ice, massive ice and permafrost layer with particulate ice. It is found from the investigation that both of them are seasonal frost heaving mounds. Based on analyses of forming mechanism, the authors consider that transmission of cold wave in winter,. hydrostatic pressure of closed system freezing suprapermafrost ground water, shallow and low permeable layer, as well as fine soil material of ground surface are the prerequisite for developing seasonal frost heaving mounds in the region.
出处
《冰川冻土》
CSCD
北大核心
1990年第1期55-62,共8页
Journal of Glaciology and Geocryology
关键词
冻胀丘
季节性
静水压力
frost of frost blister type hollow-domelike heaving mound, frost heav ing mound of candle ice type, hydrostatic pressure
