Study On Engineering Properties Of The Moraine In Sichuan-Tibet Transportation Corridor

Moraine as a product of special area is formed under some certain conditions, so people barely know it. With the development of western region, the effect and status of Sichuan-Tibet transportation corridor are increasingly prominent, and the moraine gradually attracts people’s attention which is an unavoidable problem on the transportation corridor. The author has a clear understanding of the moraine’s characteristics and classification through collecting large amounts of relevant material and site visiting some areas. The distribution of moraine is summarized. A study on the engineering mechanics properties of the moraine is conducted through laboratory test which includes laboratory gradation analysis, large scale direct shear tests and relative density test. At last, the moraine’s structure is simulated based on Cellular Automation by the Programming software of Borland C++Builder. The study as follow:(1)The distribution of Sichuan-Tibet transportation corridor moraine is concluded, including the different segment elevation distribution of moraine, and find out the factors that affect its distribution. The elevation distribution of moraine does not have a precise elevation segment because it is subject to many factors. Even if the two adjoining places the elevation distribution may vary widely. Considering all the factors, we can get an approximate elevation range to ensure that the distribution of majority of the moraine is in this elevation range.(2)We obtain that the moraine’s coefficient of uniformity is large and its coefficient of curvature is less than one in this area through gradation analysis. The result indicates that some particles is missing. When used in the project, moraine can be used as group B fillers or group A fillers under the condition of complement diameter. We come to the conclusion that its cohesion is small and angle of internal friction is large through large scale direct shear tests. That means the greater shear strength can be provided at same vertical pressure. We can get its maximum dry density and minimum dry density through relative density test. The moraine’s dry density is fixed when used in the field by reference to the relevant specifications to determine compaction. The compaction quality is assured by controlling the on-site filling dry density.(3)The simulation of moraine soil structure based on cellular automata is achieved by using the Borland C++Builder programming software. The results correspond to agglomerate and inhomogeneity of the distribution of gravel, and consistent with reality basically. It also lays the groundwork for the following numerical simulation.A systematic study on Sichuan-Tibet line’s moraine is carried on in this paper, so we have a more comprehensive understanding and knowledge about it. This research also provides a reference for the Sichuan-Tibet railway route selection and construction.