Roadbed Line Of Expansive Soil And Locale Test In Yuxi To Mengzi Railway

Expansive soil is a special clay which contains the mineral that gets close to water and has particular structure and particular character of engineering, it mostly exists by not-saturated, swelled with water and shrank without water, this character can be changed extensively.Expansive soil is a regional soil, it distributes widely in the world, and China is one of the countries which has the most area of expansive soil. The expansive soil has brought up serious disasters to the railway, traffic, water conservancy and resulted in large losses of the economy. Abroad, the expansive soil is called "expensive soil", and it had been looked as "bad soil" in our country. Therefore, the problem of expansive soil has been a cosmopolitan research subject.The author based on the research of predecessor carried on the research on theoretic, indoor experimentation and numerical value analysis through indoor experimentation and locale testing. and stressed to research the stability and distortion of the road bank of expansive soil at one containing water percent and with different reinforcing steel bar. It main contents that:1. investigate the cause of formation and distributing character of the expansive laterite and expansive muddy stone and completely weathering eluvium along the line locally. And take Statistic analysis by doing routine experimentation to test the main physics mechanics index of the expansive soil, the correlative experimentation contains water percent, density, tramp, straight cut experimentation.2. Research the relationship among the swelling rate, expansibility, shear strengthen, water percent and density by indoor experimentation.3. Accordingly to the index of swelling rate and expansibility of expansive soil, analyze the feasibility and the applicable range and the applicability of the way of adding reinforcing steel bar to different height of road bank and the request of padding in different parts.4. Accordingly to the above production, use the way of off center model experimentation to simulate the stability of the road bank with adding different thickness of reinforcing steel bar and different density and different containing water percent. 5. Use FLAC numerical value simulation software to analyze the stability of expansive soil road bank in Jianshui basin based on the method of intensity decreasing.