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1 山区水毁公路的成因1.1 自然因素 冬冻、春融、夏流失的反复循环,是山区水毁公路的直接原因。根据莱城区35年系列气象资料,多年平均气温12.8℃,最高气温为39.2℃,最低气温为—22.5℃,冰冻期一般为70天,最大冻土层厚度为0.5m左右。自3月上旬以后,气温开始回升,冻土层也随之融化。莱城区多年平均降水量为对711.1mm,其
1 mountain water damage highway causes 1.1 natural factors winter freeze, spring melting, summer loss of repeated cycles, is the direct cause of the mountain water damaged road. According to the 35-year meteorological data in Laicheng District, the average annual temperature is 12.8 ℃, the highest temperature is 39.2 ℃, the lowest temperature is -22.5 ℃, the freezing period is generally 70 days, and the maximum permafrost thickness is about 0.5m. Since early March, temperatures have started to pick up and permafrost melts. Laicheng District, the average annual rainfall of 711.1mm, its