Karst Mountain High Fill Gravel Soil Compaction Deformation Simulation And Stability Analysis

In recent years, the high embankment appears in large numbers of highway and airport projects, and it has attracted much attention. The main studies of high embankment included the compaction properties of fillers, the methods of original foundation reinforcement, the filling method, the deformation characteristics and forecast of high embankment and its stability. These achievements apply to engineering constructions successfully in Fujian-Sanming airport, Xichuan-Jiuzhaihuanglong airport and Xichuan-Kangding airport project.Based in expansion project of Guiyang Longdongbao airfield, this paper studied the compaction properties and the deformation regularity of crushed stone and made some creative achievements as below.(1) Mainly through compaction test, we got the dry density of crushed stone in the different weight percentage of water and the different coarse granule content, and got the binomial relationship in the dry density and coarse granule content of crushed stone, which of 81.25% at the maximum dry density. Through theoretical derivation, this paper came to the consistent conclusions basically in the experimental and theoretical values when the stone weight percentage of crushed stone at the smallest pore rate. At last, we also got the binomial relationship in the coarse granule and optimum water content of crushed stone.(2) The character of the compaction curve is an important index to measure the sensitivity of the coarse granule to water in different compactness. Analyzed by way of controllable water content range, it is the conclusion that the less fine particle content, the higher water content sensitivity, and the smaller controllable range. Using the water bag method to test field compactness , it is taking the advantages of high reliability, easy operation, compliance with the testing requirements.(3) There are two kinds curves of crushed stone compression creep test, one is the development process of specific compression in different loadings; another is specific compression and loadings relationship in same loading times and these all are logarithmic functions. At the meantime, using the latter curve to calculate the ultimate compression and post-compression of the 60m crushed stone high embankment.(4) In the part of the deformation numerical simulation, it used the layer-by-layer loading method to simulate the actual construction. The calculation results show that there is a great displacement in filling because of the high compression of the LooseFill and RedClay layer. The filling slope stability improved after adding the backpressure filling, and the displacement influence to the runway was gradually reduced. It indicated that the ways of crushed stone filling to control deformations one is need to strengthen compaction, the other should add the necessary backpressure filling to restrict its lateral displacement. The part of high embankment slope stability analysis, mainly analyze the stability of segmented slope with kinds of combinations of work conditions and it meet the safety requirements of airport slope engineering.