Advanced Materials Research Vols. 168-170

Abstract: Quick lime has been widely applied for improving strength and water stability of loess due to its lower costs and better effect on subgrade construction. Taking collapsible loess of Dingxi section of Luoding Freeway in Gansu province as investigation object, CBR were done in cases of different quick lime contents, water contents and compaction times as well as immersion times. The results indicated that compaction degree of lime soil would be lower than that of loess as subjected to the same compaction times. The strength and water stability of loess mixed with quick lime would obviously improve. The optimal quick lime contents were equal to 3%. A dual linear regression equation of CBR was put forward and applied in six test sections of Luoding and Baotian freeways.

Abstract: The non-stationary time series data are dealt with the hybrid algorithm modal which combining the combined kalman and AR algorithm, and the modal was build, which the parameters stochastic variance of the AR modal was set in the state equations instead of extracting the tendency items from original data in conventional AR modals, and measure equations were constructed by observation data, then the AR modal can be solved by the Kalman algorithm. The deformation prediction results of the modal used in underground tunnel construction showed that this method was accuracy and feasible.