The preference soil pit was contour line pit, the second choice was soil digging at slope bestriding ridge, and the last selection was soil digging at slope without striding over ridge.

• 提出了借土场和弃渣场的优先选择方法：借土方式应优先选择沿等高线借土，跨山脊坡面借土次之，最后考虑不跨山脊坡面借土；