1. The measured results are as following:（1） in-situ stress at shallow depth of tunnel is controlled by dead weight topography and region formation, and a typical stress distribution of ＂V＂ shape for river valley is formed.
测量结果表明：（1）在探洞浅部，受局部地形影响，测点的应力分布主要受自重和区域及地形地貌控制。
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2. Yamakita loess hills are large and fat ICo River Basin River Basin, the East West low, the surface wave V were ups and downs, high view, county River winding like ribbons on it like, the valley was the source of vertical and horizontal distribution of Stephanopyxis, River County hills to the two sides together to form a rugged hills and basins ICo.
山北为大面积黄土丘陵和肥川河流域丘间盆地，东高西低，地表呈波伏起伏，登高远眺，县川河象飘带状蜿蜒其上，其源头沟谷呈掌状纵横分布，两岸丘陵向县川河汇聚，形成高低不平的丘陵和丘间盆地。