The dynamic strength index φdwas increased with the increasing of vibration frequencies,the maximum difference was 12.

Nevertheless,it is difficult to use an appropriate earthquake intensity index for variant ground motions.

This paper introduces an experimental study on mechanical properties of self-compacting concrete,which include compressive strength,effect of specimen size,splitting tensile strength,maintain ages,flexible strength and the relationship between intensity index.

The test results show that the intensity index is strongly affected by water content of the expansive soil.

The writer claims that,intensity index,which is classified into one of relativity indicators in all books of statistics,is paralled with relativity indicators.

Regularity of relation between structural parameter and strength indexes of unsaturated loess

Based on the influence of localization according to results of plane strain tests,the strength index was employed in the design of foundation pits.

In order to give the best proportion of cement to fly-ash for coustructing cement-fly-ash stabilized crushed-stones pavement,through varying the proportion of cement to fly-ash while maintaining aggregate percentage and gradation,the variation law of mixture strength index with age is studied by experiment.

Model tests simulating the excavation of foundation pits were conducted to study the relationship between stress paths and strength parameters.

Some aspects are analized in this paper,including the direction of failure surface,stress state prior to shear,stress path during shear,and stress reorienation,which influence the strength parameters for total stress analysis.