Research On Construction Technology Of Suiyue Expressway Expansive Soil Roadbed

The expansive soil is a high scattering and high expansive special clay. It is consist of Mengtuo stone or Yili stone. It has some speciality such as much more cranny. Supper concretion and expanding with wet and contracting with dry. If it is treat with the improper method, it will endanger the engineering in the different extent, even the harm is very serious. The expansive soil subgrade is easy to slide and collapse, even to shrink, split, relax, flake and so on. And if the harm occurs, it is difficulty to deal with it. This paper relies on the engineering practice, always take the treatment process and construction technology of Suiyue highway expansive soil subgrade as the main line. through the optimization of various technology and operation, in order to give a guide for similar area.Through the limits of water content and standard moisture absorption water content test, Suiyue freeway's subgrade identification and classification of expansive soils has been studied; Three kinds of initial improvement programs were carried out which contain hit solid, compressibility, plasticity, shear strength, expansion and shrinkage of the test analysis,present reasonable program of expansive soil and its mixed doses of modified, mixing process of expansive soil has been compared and choose,presented expansive soil concentrated mixed and improvement mixing process which is adoptted; through the soil material moisture content, ash mixed with lime treat soil mixing rate and particle size, concentration mixed with the Road mix improvement and other indicators mixing operation to test a few times, made with the mountain highway roadbed and road mix ready-mixed several times; determined control range of moisture content filler, and compaction process and compaction factor.