The Study Of Crushed Stone Grouting Pile's Application In Post-earthquake Roads' Repairing Engineering

China is one of the nations that most seriously vulnerable to seism. The drastic shaking emerged by seism will devastate land-based structures such as roads and bridges. Once the road system has been ravaged, it will not only bring about negative effects on people's daily life, but also lead to a serious economic triment. What's more, it will at a large extent impede the post-earthquake salvage, rescue, dispersing as well as the material providing work, and all these above will ulteriorly exaggerate earthquake disaster. Therefore, fast repairing and ensuring the safe and regular usage of post-earthquake roads are crutially significant to the restoring and restructuring work in disaster area after seism.Under the effect of seismic force, the roadbeds mostly performs some mollisol engineering properties, like high compressibility, high sensitivity, high water content, macrovoid ratio, low strength, low permeability, etc.. The fast post-earthquake repairing technique, which belongs to emergency salvage, calls for a high requirement for reconnaissance, design and construction of special engineering. Based on collating the typical characteristics of roads suffered seism, this paper applied the new soft soil treating method, i.e. crushed stone grouting pile, which is widely adopted in coastal areas like Zhe Jiang, into the post-earthquake road repairing.Several jobs have been done as followed:(1) Collating the typical characteristics of mountainterrain and flat area roads suffered seism;(2) Based on the present grouting pile consolidating technique of composite foundation, this paper used the partially damaged roadbed as rigid roof bearing plate for grouting pile, proposed the constructural techniques of fast repairing roads after seism of grouting pile with rigid roof bearing plat, and primarily discussed the solidating mechanism and bearing behaviors of this grouting pile in composite foundation;(3) The transmission pattern of load, the characteristics of settlement and the influence factor of composite foundation borne with crushed stone grouting pile with rigid roof bearing plate were analyzed by FEM program, while the rule and the degree of the effect of these factors-such as load, the length of pile, capping plate replacement ratio, diffusing zone replacement ratio, capping plate replacement ratio, pile-soil module ratio, serous-soil module ratio. In the course of calculation, the element of diffusing zone is added in consider the pile character.(4) Using the elastic-plastic finite element strength reduction method to calculate the slope stability of embankment reinforcemented by the grouting pile.(5) By using the finite element method through step loading, the deformations is trackingly analylized between unreinforced and reinforced roadbeds after each added load step, and analylized the roadbed's sedimentation stability properties after reforcing through auto load step loading technique.At last gives the summarization of the work, it makes a conclusion about the study work, presents some summing-ups from the study work, and points out some unresolved questions for the further study.