This paper also probes into two important boundary indexes for moisture increasing deformation of collapsible loess:deformation boundary pressure P c and deformation boundary water comtert W c,analyses some factors influencing P c and W c,and introduces their engineering significance.

The distortion circumstance of mechanical seal face under high-pressure condition and its influence on the performance was anlyzed,the pressure distortion mechanism and solution of seal ring and notice items during practical design job was put forward,and partial successful experience example was listed.

The concept of deformation limit pressure as well as deformation limit moisture content,and the preliminary research on related experiment formula not only give a new idea about the initial pressure and initial moisture content, but also have the use value in practical engi.