The article mainly talks about the problems that we must think about the directing stability of hanging machine combination,the directing stable modulus X and the relationship between the directing stable modulus and critical slope;the checking about the loading of the tyre and locating the total weight of agriculture machine implements and the general uses of hanging construction.

Formula of longitudinal Youngs moduli is derived.

The results show that the average longitudinal momentum of secondary particles becomes larger and their x -distribution flatter when the multiplicity of secondary particles decreases.

Numerical modeling of influence of fault spacengel on longitudinal stability of tunnel;

This paper simulated the influences of fault angles on the tunnel longitudinal stability by the finite-difference program FLAC(3D).

The characteristics and influence factors of the longitudinal stability of subsea tunnel with long-distance,high water pressure and large diameter are analyzed;and taking a certain project for example,a study on channel dredging as a new and important influence factor is carried out.