根据广大冻土地区冬季气候和地基土冻结等特点,强夯施工时结合强夯法施工工艺与作用原理,强夯法冬季施工定义为:当冬季气温在0℃以下土壤开始冻结到第二年春季冻土全部融化(季节冻土层)为止的整个冻结期为强夯法冬季施工期。由于强夯法冬季施工的施工期较长,尤其是严冬地区,包括了初冬、初春和深冬季节,气候差异很大,地基土处在冻土—暖土、融土-冻土-暖土状态,不但其厚度不同,强度也不相同,直接影响强夯施工工艺和参数。 因此,按照气候条件、地基土的状态将强夯法冬季施工分为三个阶段:
According to the characteristics of winter climate and ground freezing in permafrost areas, combined with dynamic consolidation construction technology and principle, dynamic consolidation construction in winter is defined as: the whole freezing period of permafrost is dynamic consolidation construction in winter when the temperature of winter is below 0 C and the temperature of winter begins to freeze until the next spring when the permafrost thaws completely (seasonal frozen soil layer). Due to the long construction period of dynamic compaction in winter, especially in severe winter areas, including early winter, early spring and deep winter, the climate varies greatly. Foundation soil is in the state of frozen soil-warm soil, thawed soil-frozen soil-warm soil, not only its thickness is different, but its strength is also different, which directly affects the dynamic compaction construction technology and parameters. Therefore, according to the climatic conditions and the state of foundation soil, the dynamic compaction construction in winter can be divided into three stages:
(1)初冬——日平均气温不低于-10℃,冻土厚度不大于1.0m的月份,划为初冬。
(1) The month of early winter, when the average daily temperature is not less than - 10 C and the thickness of frozen soil is not less than 1.0 m, is classified as early winter.
(2)严冬——日平均气温低于-10℃或日最高气温在0℃以下,同时冻土厚度大于1m,划为严冬。
(2) In severe winter, the average daily temperature is below - 10 ~C or the maximum daily temperature is below 0 ~C, and the thickness of frozen soil is more than 1 m, which is classified as severe winter.
(3)春融期——日最高气温在0℃以上至冻土全部融化之前称为春融期。
(3) Spring thawing period - the maximum daily temperature is above 0 C until the frozen soil is completely melted, which is called spring thawing period.