The influencing factors to minimal concrete protective cover thickness are presented;and the criteria on minimal protective cover thickness are compared in some kinds of codes for concrete structures at home and abroad.

This article gives the calculation formula on smallest support thickness of soft stratum and large cross-section shaft and tunnel combined with the calculation method of road tunnel ground pressure,and calculates the force of support structure by FLAC3D,at last checks the stability of arch walling.

Based on plastoelasticity mechanics and surrounding rock-supporting principle,the stability of shaft was analyzed,and calculation formula of stress,displacement and support thickness were derived.

Thus,an integrated model for the minimum thickness of the intervening liquid film between two contacting fluid particles .

The concept of "minimum thickness" to meet the requirement of filter efficiency is put forward, and the theoretical base for designing ceramic filter element is established.

In this article,the regulation of minimum thickness of completed convex head in GB 150 is discussed.

In the long-term use of GB 150-1998 "steel pressure vessels" and JB/T 4746-2002 "head for steel pressure vessels",some problems of the acceptance standards of minimum thickness of convex head in the GB 150 were found.