Analysis of Disaster Mechanism and Sliding Force Response Law of Highway High Slope
Rainfall is the main factor causing and inducing landslides,and according to surveys,about 68％of landslide disasters in China were caused by rainfall.To reveal the correlation between rainfall induced factors and the deterioration and deformation of slope rock and soil,a study was conducted on the slope instability and failure mode induced by rainfall,taking the Xinfeng section of the Daguang Expressway as an example.By establishing a three-dimensional numerical calculation model for the slope of the Xinfeng section of the Daguang Expressway under rainfall and excavation conditions,analyzing the evolution laws of the landslide stress field and displacement cloud field,the buried depth of the sliding surface(H=14 m)and the exposed position of the sliding surface sur-face were determined.It was found that the exposed area of the sliding surface exhibited a main failure mode of"trailing edge tension V-shaped cracks and tongue compression uplift deformation",while the slope surface exhibited a main failure mode of creep deforma-tion.The reinforcement design and feasibility numerical simulation analysis of the"coupled anchor cable frame beam+anti slip pile"on the slope of the Xinfeng section was carried out.Finally,a comprehensive online safety monitoring and warning system for highway slope sliding force was established on the slope of the Xinfeng section,revealing the dynamic response law of sliding force with rainfall.The results show that at the reinforcement position of the anti slip pile,the deformation in the Z-direction of the slope decreases,with a maximum deformation of only 9 mm,meeting the requirements for slope control.It can be seen that this has laid a theoretical and practical foundation for the safety monitoring and deformation mechanism research of high slopes similar to highways.
rainfall slopenumerical simulationfailure mechanismNewton force
万方数据
维普
