Analysis and Research on the Construction Stability of Tunnel with Unstable AccumulationOverlying the Portal
Unstable accumulation can cause certain obstacles to the construction of geotechnical engineering such as slope engineering and tunnel engineering.Taking the unstable accumulation at the entrance of Luobang Tunnel on Kaili Ring Expressway in Guizhou as the research object,this paper explores the stability of the surrounding rock and the mechanical response of the support structure in the unstable accumulation body area of the tunnel.The stability of the unstable accumulation body's forward slope and the causes of settlement of the existing road above the tunnel are analyzed.Research has shown that when the tunnel entrance section passes through unstable accumulations,special attention should be paid to the safety of initial support at the crossing slip zone.In the case of excavation disturbance in the tunnel,the use of grouting steel flower pipe anti slip pile support has a good effect,which can significantly improve the stability of the tunnel entrance slope in the unstable accumulation area,and effectively control the settlement of the existing road.
国家科技期刊平台
NSTL
万方数据
维普
