| In view of the subgrade with a large number of earth-rock mixtures along the XiHan Highway. An in-depth and systematic study was conducted on the essential nature and classification; the laboratory and field tests of the earth-rock mixtures in the south of Shaanxi Provience; Settlement and deformation; Stability of subgrade and earth-rock subgrade construction technology. The main contents were presented as the following:(1) According to the research on engineering and survey data domestic and abroad, a summary was given to the present situation of the research on the construction technology of the earth-rock subgrade. And the main problems in the construction controling process of the earth-rock subgrade were put forward.(2) According to the structure and strength formation characteristics of earth-rock mixtures, based on the principles of simple orperating and reflecting engineering properties of earth-rock mixtures, the guideline of classification was put forward ,which was according to the lithology and the content of coarse particles of earth-rock mixtures. And the engineering classification of earth-rock mixtures was also conducted.(3) Through indoor full-scale test on the earth-rock subgrade construction technology, relationships among the different rolling compaction times and subgrade settlement; deflection value; penetration volume; modulus and the degree of compaction were proposed.(4) On the basis of the field test, conbining the researches domestic and abroad and engineering survey data, Construction technologies were proposed on the stone filling selection; construction machinery choices and allocating combinations; the whole scene spreading and compacting process, the slope builds and so on. And the construction techniques of the highway earth-rock subgrade were also summarized.(5)In view of the characteristics of the earth-rock subgrade, non-and so on time curve grey theory (2, 1) was proposed to forecast the subgrade settlement model.
|
PDF Full Text Request