The divisional walls will divide the long strippit into several small pits that will be excavated alternately to keep the old station stable and safe during deep pit excavation.
为了保证基坑开挖过程中既有车站的安全，用隔墙将新地铁车站长条形基坑分成小基坑间隔开挖。
2
Earthworks: two excavators to be used for excavation, two construction methods like single pit excavation and strip excavation to be adopted.
土方工程：采用两台挖机机械挖土，采用单坑开挖和条形开挖二种方案。
3
This paper presents a practical final-pit optimization algorithm for open-pit metal mines based on a breakeven strip ratio and a block model of ore grade.