In construction of pipe jacking, the wall of workingshaft and soil body behind the sidewall offers enormous supporting force to a lift.
在顶管施工中，千斤顶的支座需要巨大的反力支持，这些反力是由工作井的侧壁以及壁后土体提供的。
2
Larger tunnel section brings larger exposed area and higher risks when shield departs from the workingshaft, so the stability of reinforced soil in this stage is the new challenge for the work.
隧道断面越大，封门拆除时加固土体所暴露的面积也越大，施工风险也就越高。
3
All of the 28 miners who were working in the shaft were killed when an underground cable caught fire at about 8:10 pm at Xiaonangou coal mine at Sangshuping Township of Hancheng City.