The definition of volumetric joint count(J V) for rock mass is introduced firstly and the indexes of joint set spacing or frequency are more suitable to the definition of J V.

Especially,the methods to determine the parameter volumetric joint count(Jv)are studied in detail Finally,the proposed methods have been applied to practical projects and its rationality is further verified by comparing with field tests results.

The strength and mechanical parameters of large-volume jointed rockmass can be estimated by using Hoek-Brown criterion.

Binal regression equation for calculating segmental volume of Chinese young female bodies;

This paper researches the caving pattern of triangle intact rock, analyses the effect of the angle changes of the main set of joints on the cavability, and derives the equivalent set of joints, A table of the appraisal pattern is given.

Effect of NO_2 combination at atmospheric pressure on measurement of its volume fraction by ultraviolet absorption;

Quantitative solution of volume fraction of interface in cementitious composites;

Research status of the volume fraction and the material properties of functionally gradient materials;