【摘要】 文章介绍了坐标反算的方法及步骤,并结合巷道贯通前的测量结果,运用坐标反算,计算出巷道贯通位置的方位和坡度,为巷道贯通前测量放线提供依据,保证了巷道贯通精度。更多还原

【Abstract】 The method and step of coordinate countrary calculation are introduced and combining with tunnel go-through measure result,by coordinate contrary calculation count the position and slope of tunnel go-through so as to provvide the basis of putting line before tunnel go-through,which can guarantee the precision of tunnel go-through.更多还原