In this paper,a three-direction strain measurement method at a single testing point,which is different from the traditional unilateral measurement at a single point,is proposed.

Rock failure mechanism and true triaxial experimental study of specimens with single structural plane under three-dimensional stress

It is of important significance to study the ultimate bearing capacity of foundation in three-dimensional stress.

In this paper, the mechanical characteristics of camel shoe has been analyzed and, the foot print and distribution of three dimensional stress under the camel shoe and loaded capacity of the sand under the action of a plate with two different behaviours have been tested and researched.

The approximate formula of the changing value of wall thickness of the inner and outer side of the tube and the formula of the tangential strain are presented,which may be applied to practical production after amending.

It was found that during the no_mandrel bending forming process of minor diameter tube,the actual tangential strain along pipeline direction was approximately distributed in parabola,and the maximum strain appeared around the intermediate section of the bending angle.

Study of dynamic pore water pressure and axial strain in saturated sand-gravel composites;

A new type of test method called multi-spots axial strain sensor was elaborated,the development conception and test principle were also introduced.

Then,the sand liquefaction process is divided into four phases according to the different behavior of hysteresis loop,during which the development characteristics of axial strain are analyzed.