Study on Stability Analysis of Expressway Crossing Large Ancient Landslide
The construction of high-speed highways in mountainous areas will inevitably cross ancient landslides,which will have an impact on the stability of the roadbed.In order to study the feasibility of roadbed crossing ancient landslide,this article relies on a large-scale ancient landslide treatment project of a certain highway in Guangxi.The sliding range is obtained through on-site drilling method and audio magnetotelluric geophysical exploration method.Numerical analysis method is used to calculate and analyze the stability of the ancient landslide roadbed.Measures are taken to reinforce the sections with poor stability.The results show that the apparent resistance results are relatively similar to the drilling results,it can be used as a method for determining the range of ancient landslide bodies(the basis for determining ancient landslide bodies);the internal joints and fissures of the ancient landslide are developed,the rock mass is broken,and water enters along the fissures,causing low apparent resistance anomalies.The depth is 0.00～30.00 m,and the resistance value is between 0～150 Ω·m,which is the boundary range of the ancient landslide;based on the audio magnetotelluric method to detect the range of ancient landslides,the interface unit in FLAC3D is used to simulate the loose soil in the ancient landslide zone,which can better simulate the stable state of the ancient landslide;further simulate and analyze the impact of different road design conditions on the stability of ancient landslides,and use anti slip piles or wide platform unloading,anchoring,drainage and other methods for protection.The results can provide reference for similar projects.
large ancient landslideexpresswaymagnetotelluric methodborehole surveyFLAC3D
NETL
NSTL
万方数据
