Analysis And Assessment Of The Stability Of Loess Landslides In The Tong Yan Highway

When our country's strength of economy and technology is great developing, more and more new roads are constructed in the mountainous loess area in the west of China. Therefore the geology environment that we face to is more and more complicated. The loess land slide is an important factor to engineering. By the spot investigates and thorough research, experiment, the writer obtained plenty of first hand information about loess land slides. By the way, the writer also collected a lot of domestic and international research data about loess land slides, then absorbs the excellent fruits. The aim of the paper is to realize the process of loess land slide distortion and breakage and the characteristics of slope structure. Then analyze the influence factors and characteristics of distortion and breakage. By appraising of loess land slide stability, compartmentalize types and grades of loess land slides.TongYan highway passes through the North Shaanxi loess-plateau, loess-beam and loess -hill physiognomy area. In the area, the new tectonic movement is quiet; There mainly appears gritstone and mudstone of the Jurassic and Trias period in ditch and hollow. The surface water and the ground water are greatly influences to the landslide. In the loess physics and mechanics parameters, the important factors that affects the landslide stable is: Bulk specific gravity, water content, shearing strength, elasticity coefficient, poisson's ratio. By investigation and statistics, it is found that there are 54 loess landslides which mainly lies along loess plateau, beam and hill. Considered the slope substance, structure, sliding-surface position, sliding-bed lithology, the project need and so on, there are loess type, loess and bedrock contact type, loess and bedrock cutting the mixed type, remnant diluvial type landslide in TongYan highway. It has distortion characteristics with wriggling distortion, extrusion distortion and pull-opening distortion. The engineering geological pattern of distortion destroys is mainly landslide body wriggling with the toe of slope extrusion, landslide body wriggling with the rump pulled-opening. Thus the thesis summarizes that the...