Experimental study of microstructure of Changchun subway line 2 construction layer clay soil
Structural properties of soil have an important impact on its engineering properties, and soils microstructure and macroscopic properties are inextricably linked.The macroscopic properties of soil such as anisotropy and permeability can be explained through qualitative analysis and quantitative analysis of particles, pores and some other microstructure properties.Therefore the pore water pressure transfer mechanism, the distribution and movement of pore water in different soil layers can be analyzed at micro-scale.Besides it can provide the appropriate reference data of underground structures design in floating resistance.Based on mercury intrusion tests and scanning electron microscope tests, this paper mainly studies the microstructure of clay soil, which was obtained form the construction layer of Chang chun subway line 2, before and after the consolidation test.Then qualitative and quantitative analyses are made after these tests.The particles of clay soil are edge-to-edge contact and edge-to-face contact before consolidation test.After consolidation test, the particles are observed as edge-to-face contact, face-toface contact and the pore size tends to homogenization.Besides particles tend to be much closer, pores become smaller and the pore size distribution is reduced.The pore size distribution, pore quantity, pore area all show certain anisotropy before and after consolidation test.
B.Zhang F.Feng S.Cui B.Wu
China University of Geosciences,School of Engineering and Technology,Beijing,China
国际会议
International Symposium and 9th Asian Regional Conference of IAEG(第9届IAEG亚洲区域会议)
北京
英文
771-776
2013-09-23（万方平台首次上网日期，不代表论文的发表时间）