浅埋不良地质条件下小净距隧道掘进及减振爆破技术研究.pdf

2011 1 Jan 20 11 1( 14 8) JOURNAL OF RA ILW AY ENG IN EER ING SOC IETY NO. 1( Ser. 14 8) : 1006- 2106 ( 20 11) 01- 0051- 07 ( 中铁三局集团有限公司 太原 030001) : : : ( 1) !∀ 5. 8 m ; ( 2) 1. 8 cm / s 11. 02 cm / s : ; ; ; ; ; + : U 2 31 3 : A Research on Driving and Damping Blast Technologies for Construction of Shallow SmallClear- distanceTunnelunderFavorableGeologicalConditions ZHA G Jun- bing, HU Guo- wei ( The Th ird Eng ineering Group Co. L td of Ch ina R aiwl ay T a iyuan Shanx i 0 30001 Ch ina) Abstract:Research purposes: T he research w as done on the driv ing and dam p ing b last techno log ies for con stru ction o f sh allow sm all c lear - d istance tunne l of light ra il transit in X inzheng Chongqing under the favorab le geo log ica l condition s of so ft and hard m ixed strata and the w eak rock p illar to gu arantee the stabilities of the w a ll rock and supporting stru cture and the safety of underground p ipe lines and ach ieve the good sm oo th b lasting e ffect. Research conclusions: ( 1) T he large p ipe roof con stru ction w as adopted to the sha llow area w ith filling so ft so il around the tunnel portal. T he positive tri- bench m ethod the positive b i- bench m ethod w ith rem aining the core so il the positive b i- bench m ethod and fu llw a ll excavation m ethod w ere u sed along w ith sm ooth blast ing resp ect ively to the w all rock s of G rade ! and ∀. T hese constru ction techno log ie