Research on the Effect of Ground Treatment Measures of Highway Culvert in Collapsible Loess Area
ZHAO Yong - hu1，MI Wei - jun1，SUN Run - dong2，QU Yao - hui1，RONG Lu3，LIANG Heng - xiang1
(1. Northwest Research Institute Co. Ltd of China Railway Engineering Corporation，Lanzhou，Gansu 730000，China; 2. Qinghai Research Institute of Transportation， Xining， Qinghai 810000, China; 3. Lanzhou Jiaotong University， Lanzhou，Gansu 730070，China)
Abstract：Abstract：Research purposes： The highway culvert diseases are often occurred in collapsible loess areas. In order to solve the problems of post - construction sedimentation and large deformation of culverts caused by poor ground design in collapsible loess area，taking the two culverts of collapsible loess areas of Minhe to Xiaoxia I - grade highways in Qinghai province as examples， the actual effects of different ground treatment measures and settlement and deformation characteristics have been analyzed based on the methods of replacement and lime - loess compaction pile，to provide the reference for the application of different ground treatment methods of highway culvert in collapsible loess area. Research conclusions:( 1 ) The methods of replacement and lime - loess compaction pile can effectively eliminate or decrease the collapsible deformation of culvert ground caused by soaking and improve the bearing capacity of culvert ground significantly. (2) Compared with the replacement method，the lime - loess compaction pile method is more 9fective in the aspect of improving the compression modulus of ground soil. (3) By the field monitoring dada，the accumulative total sedimentation during a whole year is 25. 0 mm for the replacement method and 18. 2 mm for the lime - loess compaction pile method，and accounts for 79. 9% and 78. 1C of final settlement respectively. The settlement deformation of both kinds of composite ground presents the trend of the increasing rapid in the early stage and smooth and stable in the late. (4) The cumulative settlement of culverts which were processed by ground treatment keeps in a stable and controllable range， which can effectively improve the security of culvert structure. Lime - loess compaction pile method may perform a more important function in reducing the compression deformation of collapsible loess and improving the bearing capacity of culvert ground than the replacement method. (5) The research results can provide the theoretical guidance and scientific basis for ground design and disease prevention of culvert in collapsible loess areas.
2017, Vol. 34 
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