Experimental Study And Practice Of Dynamic Compaction For Filled Subsoil With Block And Crushed Stones In Mountain Area

As an effective ground treatment method with the merits of cost-saving and rapidness in construction, Dynamic Compaction Method (DCM) has, more and more, obtained extensive engineering applications. However, for this method further researches are still needed in the areas such as design of construction parameters, testing of improved ground and its application in special soils. In this thesis, utilizing a huge ground treatment project for a petrochemical plant in Northeast China as the background, practical problems on DCM application in the treatment of filled subsoil with block and crushed stones in mountain area have been studied through experimental study and engineering practice. The major works conducted in this thesis can be summarized as follows:(1) On the basis of study and analysis on the results from preliminary dynamic compaction tests for the particular ground treatment project of petrochemical plant in Northeast China, appropriate construction parameters and construction methodology were obtained for detailed DCM design;(2) Basic concepts, methodology, advantages and disadvantages of various testing methods were examined, comprehensive application of these testing methods for filled subsoil with block and crushed stones in mountain area were studied. Furthermore, for a specific testing area, relationships among static load tests, dynamic penetration tests and Rayleigh wave tests were proposed by means of regression analysis.(3) A set of design system of DCM for filled subsoil with block and crushed stones in mountain area has been established, in which particular attentions were paid to the problems of initial treatment for ground surface, determination of construction parameters, quality control of filled materials, treatment of interface between filling and excavation areas, stability of high fill slope, respectively.