Comparison of the actual behavior resulting from the testes and those from the pseudo-static method and rigidity-reduction method indicates that the dynamic p-y curves from the tests and f.

On the basis of analyzing character of shear strength of clay,this paper gives a theory that we can use discount coefficient to deal with shear strength aiming at its obtain problem of designing construction foundation pit bracing.

Aiming at problem of shear strength in designing construction foundation pit bracing, the paper gives a suggestion that we can use discount coefficient to deal with shear strength C.

in an experimental design, the problem of point estimation of unknown parameters is extended with discounted coefficient method from double-factor experiment to three-factor experiment with repeated numbers obtaining more standarized results.

Due to the lack of detailed information of the system in the concept phase of development,an index eclectic quotiety method is introduced to resolve the problem.

Method A new method for defining the environmental conversion factors of failure times has been given basing on the AMSAA model, and the MTBF point evaluated values and lower confidence limits of the units were defined, at last, the lower confidence limit of the system reliability was obtained using L M method.

According to the AMSAA model, a new method of time environmental conversion factors determination was proposed through optimization process in view of system engineering, which made full use of the failure data including the same kind of products and the similar products in their development phases.