J . melan proposed the deflection theory for analyzing large - spanned suspension bridge early as in 1888 . the finite element theory has been so advanced today and has been widely applied in analyzing suspension bridges J . melan早在1888年就提出了大跨度悬索桥的挠度理论，空间有限元理论也在七十年代中期趋于成熟并广泛应用于大跨度悬索桥的分析。
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In this paper , the numerical techniques and computational methods for limit analyses and shakedown analyses of soil structures and foundations are systematically investigated and then are employed to the assessment of the safety of the non - homogeneous foundations and the offshore platform foundations . in this dissertation , the computational method which combines elasto - plastic analysis with melan ' s theorem is developed and then applied to evaluate limit load and shakedown load of soil structures . elasto - plastic analyses are performed to obtain elasto - plastic stress field and elastic stress field 在岩土工程领域，饱和粘土的安定现象与饱和砂土的液化早已为人所知，但是安定性理论及其分析在工程实际中并没用受到足够的重视，在这方面的探索研究也极为有限，这与土体稳定性评价中广泛应用极限分析方法极不协调，而在海洋平台地基等实际工程中安定性问题又显得十分重要。
