Comparative Study of Construction Sheme Otimization for Excavation of LD Tunel
LD reroute highway tunnel exit section belongs to the railway within 1 km,which has strict requirements for the tunnel construction.And the window period seriously affects the construction progress,so the construction section is not suitable for blasting construction,the site using XCMG XTR6/280 cantilever tunneling machine for tunnel excavation.This paper investigates the research results of milling construction at home and abroad,and relies on the LD tunnel milling construction site test experiments to get the geological conditions suitable for LD tunnel milling construction.And through the loosening circle test,the initial support structure force test,and numerical analysis,the impact of the cantilever tunneling machine construction and blasting construction was compared under the same geology on the surrounding rock disturbance.The experi-mental results show that when the geological conditions of the LD tunnel are rock compressive strength less than 40 MPa,rock integrity coefficient less than 0.2,rock quality index RQD less than 20%,the number of volu-metric joints in the rock is more than 30/m3,and groundwater is not(weakly)developed,the cantilever boring machine boring rate is higher than that of blasting method construction,and the disturbance of the surrounding rock by the construction of the cantilever boring machine is much smaller than that of blasting method construc-tion.The diversion tunnel is similar to the LD reroute highway tunnel,which can provide a reference basis for the railway-related part of the diversion tunnel and similar projects.
cantilever tunneling machinenon-blasted excavationdrill and blast methodcompatibili-typerimeter rock disturbance
NETL
NSTL
万方数据
