It is easily collapsed for shallow and unsymmetrical large-span tunnel near portal in soft rock.
软岩地区浅埋偏压大跨度隧道进口段极易塌方。
2
Based upon the shield construction practice in the portal section of South Tube of Yanan Donglu Tunnel, this paper demonstrates the technology for slurry balance shield passing through freezing zone.
本文以上海延安东路隧道南线盾构进洞段工程施工为背景，论述了泥水平衡盾构穿越冻结加固区的施工技术。
3
Objective To study the therapeutic effect of transverse carpal ligament release on carpal tunnel syndrome (CTS) with arthroscopic "two-portal" technique.