The problem the snow causes influences the people ' s lives and impedes the economic development . meanwhile the transportation infrastructure such as highway intercity and airstrip needs a great amount of deicing salts to maintain the bare road . therefore from 1980s , many areas and countries such as north american , north europe , japan have greater and greater demands on the deicing salts , about 20 million tons per year , only japan needs 200 to 300 thousand tons per year 在我国和世界上许多国家的高寒地区，冬季冰雪已成为严重的公害，积雪引起的问题不仅给当地人民的生活带来困难，而且阻碍经济的发展；此外，城市高速公路，机场飞机跑道等交通设施对冬季除冰剂的使用也日益迫切，因此，九十年代以来，北美、北欧、日本等多雪地区和国家，对融雪产品的需求量与日俱增，年需求量在2000万吨左右，其中仅日本就需20 30万吨。
In connection with impact compaction technology of soil & stone cushion of third airstrip of pudong airport , it selects such experiment research as constructive technology & quality control , puts forward such constructive control parameters as pressing subsidence ratio ( single subsidence ratio ) , pressing times , pseudo thickness and so on 摘要基于浦东机场三期跑道山皮石垫层采用冲击压实技术进行压实的问题，选取试验段进行了施工工艺及质量控制等试验研究，提出了冲压沉降率（分计沉降量） 、冲压遍数、虚铺厚度等施工控制参数。
