REPLACE A DRAINED TYPE NATM TUNNEL WITH AN UNDRAINED TYPE
NATM tunnels in Korea have been designed and constructed as a drained type waterproofing system to reduce the high external water pressure. Constructed at a depth of 30 meters the high water pressure has caused problems such as ground settlement over NATM tunnel, underground water depletion, pumping cost, and premature structure aging. After seven years of service it was decided to convert the drained type waterproofing system to an un-drained type. Performance requirements of a new waterproofing layer were established and the waterproofing seal (Turbo-Seal) suitable for this application was developed. Impact-Echo Method, GPR and Rebar detector methods were employed to review the structural integrity of the tunnel structure while under high water pressure. Subsequent test results revealed it was safe to use a grouting back method to inject a new lining into the existing waterproofing layer (ECB layer). A grouting waterproofing method with a viscous and flexible material (Turbo Seal) has been successfully installed to achieve an un-drained type waterproofing system in the tunnel.
Hwang, Deok-ll Kim Jung-Yun Kang Ho-Kyoung Lee Jong-Yong
Manager, Civil Engineering Team, KT Real Assets Development Center Director, Civil Engineering Team, KT Real Assets Development Center Director, Customer Service Team, KT Customer Service Group The Representative Director of Re-New System Co., Ltd.
国际会议
南京
英文
739-747
2006-05-22（万方平台首次上网日期，不代表论文的发表时间）