In order to forecast the space situation and the law of the fracture occurring,the complexity of the development of a quantitative theory of the phenomenon of uniform spacing fractures is determined by the need to simulate the behavior of a medium having the properties of elastic deformation in fracture.

Taking the strain as index,the expression of caving step length of roof is established.

The Research for the Crack Spacing of the Reinforced Concrete Beam;

Cracking positions are the weakest part of Continuously Reinforced Concrete Pavement,and crack spacing and crack width are the two control indexes.

Taking the Lei yi highway as the main body,This article carries on the long-term observation,makes the research on the law of development of Crack Spacing and Crack width,and then evaluates the crack Spacing and the width fit and unfit quality,Finally it provides the reference to the research on the CRCP long-term performance.

5 a,and the test results of crack space and crack width were analyzed by using statistical method.

Based on the elastic foundation beam,the control differential equation of tunnel lining is worked out,according to the theory of Saint-Venant,the predominance equation about the center angle to the crack space is established, then the crack space of tunnel lining under the loads can be worked out and according to the crack space,the crack width can be calculated.

The matrix crack spacing distribution of 3D C/SiC composites;