Study On The Stability Evaluation And The Widening Ways For The Rebuilding Cutting Roadside Slop

In view of the high slope excavation construction is difficult, long duration, greatinfluence on operation and temporary road closed, therefore, based on Hangzhou (Hongken)to Jinhua highway reconstruction and extension project, through field investigation,theoretical analysis, Lizheng geotechnical software and other methods, study on slopestability along the expansion process and the broadening way of continuous high slopesections. The main research results are as follows:(1) Through the investigation of Hangzhou (Hongken) to Jinhua along the highwayslope regional environment, preliminary master the distribution of road slope and stability,and analyse the mechanism of deformation and failure of slope.(2) Combined with the survey data and Lizheng geotechnical software, analyse thechange law of slope stability under the different influence factors, the results show that, theslope safety factor decreases with the increasing level of fissure water in rock; the effect ofsingle stage excavation depth on the safety factor is less than the slope ratio; the relationshipbetween the dip angle and slope stability is not simply increasing or decreasing relationship.(3) Analyse the stability of a five stage high slope in K92~K96section, and analyse theinfluence of anchor design on slope stability to optimize the reinforcement scheme, theresults show that, the safety factor becomes larger after excavated the fourth grade of slope;because of the influence of construction disturbance, the safety coefficient is decreasingoverall; the more close to the slope toe excavation influence on the overall stability of theslope is greater; with the increase of bolt length, slope safety coefficient increase graduallydecrease; the safety coefficient increase with the anchoring angle, when increases to a certainextent, the safety factor decreased; the anchor arrangement scheme of above short below longis beneficial to the overall stability of the slope.(4) Follow the principle of reconstruction, and combined with the results of slopestability evaluation,analyzes the broadening way of continuous high slope section, putsforward a reasonable widening scheme.