Analysis and study of the subgrade bedding disease in expansive soil area;

This paper analyzed the parameters of underwater blasting ramming and pointed out that the construction must make use of underwater shock wave,increase energy dense,and distribute symmetrically to make more blasting energy act on the surface of stone bedding,and consequently,to increase solid degree and improve construction quality.

Compared with the traditional hammer ramming method,the explosive ramming method of wharf bedding has characteristics of short construction period,simple process,low cost and good quality.

Experimental research on swelling rocks′ roadbed improved with lime additive;

It has been founded that the analysis model of semi-infinite three-dimensional spatial finite elements for the slab track-roadbed systems with soft rock as embankment filling,firstly,based on weak variational form of the equilibrium equations for the system in D’Alembert method;and the dynamic characteristics of the slab tracks in high-speed railways are investigated.

The measures of the subgrade bed diseases of railway in the expansive soil;

Detailed introduction is made on filling construction from bottom layer construction of subgrade,graded broken stone filling of surface layer of subgrade bed and other aspects,which provide good references for roadbed construction of high speed railway.