Study On Capillary Water Action And Control Technology Of Silt Soil Foundation Of The Yellow River Flood Field In East Of Henan

With the rapid development of Chinese highway construction, it has important significance forpromoting the national economic and social development to ensure the safety and unblocked roadtransportation. The special silt soil has a strong capillary action, which is distributed in both sides of theYellow River. The rising of capillary water will change types of aridity and humidity of each layer ofsubgrade soil, which will result in the water content of each layer of subgrade soil changing. Then, inally, itcan effect strength and deformation of subgrade soil, and cause some roadbed diseases, such as subsidence,frost boiling and collapse. Finally, the changes will cause serious damages to the pavement and subgrade.Aiming at diseases caused by capillary water, some engineering measures have been taken nowadays, butthe effect is not ideal because of the lack of theoretical research. Therefore, it is very necessary to study thecapillary water action and control technology of silt soil located in the Yellow River flood field in theeastern Henan.This paper focuses on silt soil of the Yellow River flood field in the east of Henan. By using themethod of theoretical analysis, test and numerical simulation, the major contents studied are as follows:（1）Based on particle analysis test, liquid and plastic limits, X-ray Diffraction (XRD), full chemicalanalyses, leaching solution, this paper discusses the basic physicochemical properties of silt soil of theareas formerly flooded by the huanghe river in the eastern Henan.（2）According to capillary rise laboratory test, the law of capillary water increasing under differentcompaction degree were discussed. Respectively, with the cushion layers of cement stabilized soil, fiberadding cement stabilized soil and graded broken stone, some tests were completed, through which thebarrier properties to capillary water were studied.（3）Series tests, including compaction test, unconfined compression test, and freezing and thawingtest of pure soil and cement stabilized soil, were put forward, and the influence of capillary water onstability of subgrade were studied by establishing the relationship between water content and strength.（4）By using modules of SEEP/W and SIGMA/W in GEO-STUDIO software, the numericalsimulations of silt soil of the Yellow River in the eastern Henan were done, which included the migrationlaw of capillary water upward movement and the subgrade deformation under capillary water action. Reference value of the maximum rising height of capillary water, and the influence on the subgradedisplacement of different groundwater level and different filling height were obtained.（5）According to the results of indoor laboratory tests and numerical simulations, the influencingfactors of capillary water of silt subgrade located in the area of Yellow River flooded in the eastern Henanwere considered. Finally, treatment recommendations were proposed.