If there are lack of suitable material filled roadbed during expressway construction,sand covered by soil can be selected as one kind of roadbed structure.

Permanent deformation prediction model of sandy soil under repeated load;

Test research on internal friction coefficient of sandy soil tunnel surrounding rock;

Mesomechanical simulation of seepage flow in sandy soil;

Progressive failure of sand and its numerical simulation;

Compression-dilatancy coupling effect and asymptotic state criterion of sand;

Numerical simulation of stress path tests on sand;

Analyzing and preventing seismic liquefaction of sands;

Deformation behavior of sands subjected to cyclic rotation of principal stress axes;

Test research for influencing factors of the cohesive strength of sand soil tunnel surrounding rock;

Interior stress change rule of sand soil liquefaction and criteria of engineering liquefaction;

Estimation of pore pressure of saturated compact sand soil in non-linear state;