山区公路路线所经过的地区,地质、地形、水文、气候等往往变化很大,因此,山区公路,无论从测设施工或养护方面而言,情况都比较复杂。以贵州省而言,纬度上,海拔上,都位于降雨量较大,雨云容易形成的地带。一年中有半年以上多雨,月降雨量或日降雨量非常集中。又因山区地表倾斜度较大,地面水汇集很猛,常常带来较大的灾害。一条公路修建完工以后,测设或施工人员很少有机会对已修建的公路在雨季进行观测和分析。养路部门,亦往往因 The area, geology, topography, hydrology, climate, etc. that the mountain highway route passes through often varies greatly. Therefore, the mountainous highway is complicated in terms of survey and measurement of construction and maintenance. Guizhou Province, latitude, altitude, are located in the larger rainfall, rain clouds easily formed zone. More than half a year in the rainy, monthly rainfall or daily rainfall is very concentrated. Due to the steep slope of the mountainous area, the surface water pool is very fierce, often resulting in greater disasters. After the construction of a highway is completed, the surveyor or builder rarely has the opportunity to observe and analyze the constructed road during the rainy season. Road maintenance department, but also often due to