Study On Treatment Of Typical Road Cutting Slope In Nanling Mountain Area, Hunan Province

With rapid development of our country’s expressways, more and moreexpressways continuously extended to mountain areas. There will certainly existplenty of deep digging cutting engineering in roadbed engineering if we want to buildsome roads at a high level under so complex topography, landforms and geologyconditions in mountain areas. The high-slop instability of roads in mountain areas isclosely related to life safety, property safety, construction efficiency and operationefficiency. Although the slope is stable under natural conditions, the stability of theslope will be damaged by other external factors such as rainwater and humanactivities. In order to keep people’s life and property safe, some treatment measuresmust be taken before or just after the instability so that we can stop the consequencesof instability from keeping on expanding. Therefore, carrying out researches intothe treatment of the slope’s instability has a great significance.This paper does researches into the treatment of the typical road slope in the lightof geological characteristics such as changeable topography, rock stratum andcomplex geology structure. This paper summarizes the geology condition according toexperimental analysis and document data, investigates the road slope having built orbeing built and analyzes the characteristics of the road slope in this area. SinceK19+190~K19+320 and K127+800~K127+900 are parts of Hunan Yanru Expressway;what’s more, these two parts are typical landslides. Therefore, both of them areselected to be studied to analyze the characteristics of the landslide and the causes ofthe slide. The paper poses the comprehensive treatments contain cutting slope andreducing load, strong supporting, short supporting and them combined with slopeprotection, drainage measure, slope grouting and so on for the cutting slopes inNanling as well as the detailed ways for the above two mentioned typical cuttingslopes, which is based on the characteristics of geological conditions in Nanling andconstruction requirements. This paper does a pre-numerical-simulation analysis and apost-numerical-simulation analysis for K19+190~K19+320 and two treatmentschemes analysis for K127+800~K127+900 respectively. The results are safety factorincreased to 1.50 after treatment from 0.57 and the displacement reduces obviously ofK19+190~K19+320. The two treatment schemes can meet the requirements ofstability and the maximum displacement are almost equal of K127+800~K127+900. So compared with the two treatment schemes from economy and constructiontechnology, etc. Compared with the second scheme, the first scheme can save 2.417million yuan, construction technology also better. Therefore, this paper chooses thefirst program.Anti-slide pile and anchor rope ground beam retaining have been constructed ofK19+190~K19+320 at present. Earthwork have already unloaded of K127+800~K127+900. Now the two slope are at the state of stability from construction site andmonitoring data. So we can think that the treatment results are well.