The Mode Research Of Ecological Reconstruction Of Expressway Rock Slope Based On The Digital Identification Of Rock Mass Structure

With the rapid development of economy,the traffic transportation is increasingly valued by the state,and because of the advantages of fast speed and convenience,the expressway has been developed rapidly in recent years.At the same time of highway rapid construction,there are a large number of bare rock slope along the expressway,and the high and steep rock slope has become one of the key factors restricting the ecological environment protection and ecological reconstruction along the expressway which is one of the core tasks of ecological civilization construction in China.Therefore,the research work on the ecological restoration and reconstruction of rock slope along the expressway plays an important role in the construction of ecological civilization in our country.In this paper,on the basis of predecessors' research results and present investigations about study area's geological survey,climate,soil,biologic,the status quo of ecological destruction of slope and that of slope ecological reconstruction,with representative section's rock slope along the Chengde-Tangshan expressway as the research object,choose those representative measuring points to conduct the digital photogrammetry of rock discontinuities.According to the measured area‘s digital photogrammetry results and rock mass qualities,and combination of hydrogeology and engineering geology,soil,climate and other conditions along the highway,put forward the ecological restoration and reconstruction schemes of all kinds of rock side slopes with pertinence.The main research work of this paper is as follows:(1)Basic survey of the study areas.Taking the rock slope along the Chengde-Tangshan expressway as the research object,the geological survey,climate,soil,biologic,mining status and slope ecological current situation in the study areas were conducted site investigations.(2)Three-dimensional digital photogrammetry of rock discontinuities in study area.With the help of three-dimensional digital photogrammetry system(ShapeMetriX 3D),digital photogrammetry of rock discontinuities was conducted in the representative measuring points of rock slope ecological restoration area along the Chengde-Tangshan expressway.According to the digital photogrammetry results,analyze the spatial geometry information of rock mass structural plane(3)The rock mass quality evaluation in the study area.Sample at each measuring points and carry out tests of the uniaxial compressive strength of water-saturated in the laboratory.According to the spatial geometric information of rock discontinuities and uniaxial compressive strength of water-saturated,the rock quality is classified.(4)Ecological reconstruction scheme selection.According to the spatial geometry information of rock discontinuities and the quality grade of rock mass,the corresponding ecological reconstruction scheme is selected.