| Excavation engineering mainly include excavation support system design and construction, and soil excavation etc. It is strong comprehensive system engineering. Because geological conditions of every area are different, excavation engineering has a very strong regional and individual characters. The soil pressure that support systems bear has stronger space-time effect too. It is excavation engineering regional and individual characters that offer us bigger space to research the design knowledge of excavation support, study corresponding excavation stability, and internal force and displacement of the support structure, the impact on the building around and underground pipeline of displacement of the stratum, and computational analysis of protection. By that means, we can adopt the economic and practical excavation support project. So it has the important theoretical and reality meanings.This text has carried on research to above-mentioned problems, the main content includes: (1) the choice of excavation support method. Combine the commonly used support structure form at present, the author put forward the characteristic composite using many support structure forms; (2) the study on water seal ,precipitation and drainage measures. Put forward the influence on support engineering stability by precipitation system. (3)Combine project reality, this paper put forward new design project of the support structure. Include choice of scheme, support system design of soil-nailing wall and anchor-pile composite supporting structure, excavate and monitor measurement in excavation engineering. It discusses especially the finite element method on anchor- pile support in deep excavation and on design computing of soil-nail wall. (4) This paper demonstrates the issue with the case study and real design data, and achieves the design purpose through practice.We research the stability of two typical foundation ditch in the region of Shang HAI Bao Gang,using sorts of construction,and resolve the stability problem of un-sustain side slope in soft soil foundation,reducing largely investment outlay by PHC pile instead of steel-pipe pile which is always used by construction of Bao Gang,the stability of side slope protects PHC pile.The application of super-deepth constinous concrete wall in foundation ditch sustain instructs that it still holds intensive vitality,the deapth of 50 m of constinous concrete wall creates the maximum of national. The problem of confined water in the construction of cyclone desilter is soluted by proper designing of depth well precipitation.Excavation support systems generally include soil retaining system and drainage system; it generally bears soil pressure and water pressure. So its choices are greatly affected by area, and the levels of underground water have greatly influent on support system choice, for example. The composite application of many support methods is the effective way to research the problems of excavation supporting structure engineering in some special regions. In addition, through the means such as improving the soil in supporting structure passive district, reducing the underground water level etc, we can improve the strength state of structure effectively. The method adopted include mainly intermix in deep layer, high pressure spray casting and pressure casting etc. The researched excavation has two completely different structures. The top of it adopt soil-nail wall and the bottom adopt slope protection pile combined with two bolting. There drill precipitation wells around the excavation. This text calculates the single anchor stock and many anchor stocks respectively. The calculation of single anchor support structure adopts static balance method and equivalence beam method respectively. According to trial method, depth of penetration t needs to be supposed in advance, and then calculate support strength. On the safe side, we should use active soil pressure and passive soil pressure to calculate the support strength before T increased. That is RA=EA...
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