冻胀工程测量研究

Research of the Frostheaving Project Survey

Lanxi, located in the middle of the Heilongjiang Province, belongs to the seasonal freezing region, where the frozen depth and frostheaving curves with time have been gotten in winter of 1990 and 1991. From those curves we can see that when the earth begins to freeze, the frostheaving happens at once and increases with the frozen depth, and notice that the surveyed altitude somewhere in freezing period is differint from that in warm period, and equals the altitude in warm period plus the frostheaving amount.Some bad results for engineering project have been analyzed due to the mixed usage of altitudes in freezing and warm period. For the area where the frostheaving is weak and the project with lower accuracy, the surveyed altitude in winter can be used, otherwise, only the surveyed height in unfreezing period can be used to project design and building.