It was shown that ① For the rockfills with determined particle grading,the conversion between shear dilatancy and shrinkage of the samples depended upon a critical initial void ratio(e0)crit and critic.

The study has shown that the transient modulus of MSW is changed when the organic content,the initial moisture,the initial void ratio or the degradation degree of MSW changing;and some changing laws due to influences of above-mentioned factors are obtained.

The original porosity lied on clastic size and lithofacies so that the original porosity of a sort clastic bed can be considered as the same, but the compaction process could be different from each other.

With new inferring method and theory,difference of initial gap distribution laws in basic ways of gear modification is analyzed.

The closing constitutive relation for the frictional contact with initial gap is added to the model in this paper, which makes it more perfect.

The computation shows that the equal number of the maximum strain of the beams is well consistent with the maximum strain of the beams which is ob-tained by the equal number of the initial gap of the beams.

This paper introduces a new easy calculating method by which the original gap of gear shape repaired cycloid pin gear planetary reducer and standard pin gear be estimated,making two variables φ and τ in one expression change a function of one variable τ,which largely simply calculational program.

In the present study, a stiffness matrix of cylinder shell elements was established with the influences of incipient interstices and stiffeners taken into account.