Experimental Study On Dynamic Characteristics Of Sandy Soil Under Subway Moving Loads

In recent years,with the rapid development of economy in our country,traffic jams occur very frequently in the city,traffic congestion situation like this has brought the residents in the city is very inconvenient.Bring convenience to the residents in the city of travel and ease traffic pressure,we have already had dozens of cities have already completed the construction of the subway and officially running,and as the first-tier cities in China is the earliest opening line,and then more and more cities are also opened the subway lines,and some cities are building subway,and more and more cities will gradually build the subway.The normal operation of the subway has brought people a lot of convenience,and people have eased the traffic pressure.Shenyang subway is currently the northeast three provinces first running of metro trains,is currently building other lines of subway,the construction of shenyang subway greatly ease the shenyang area traffic situation,as well as the three northeast provinces of subway construction provides a good reference in other cities,shenyang subway 9 is the one in the present stage of shenyang metro planning,the line across the five regions,shenyang and line network plan of the other nine cross transfer to line 13.The construction of subway line 9 can bring more convenience to residents.However,the operation of shenyang metro will have an impact on the surrounding soil,which may cause deformation of the soil around the foundation,which may lead to more serious consequences.Therefore,it is very important to test the dynamic characteristics of soil in the vicinity of shenyang subway tunnel.Based on shenyang metro line 9 as research background,the shenyang area near metro line 9 sand has carried on the dynamic characteristic test,analyze and study the compactness,confining pressure and consolidation stress ratio,frequency and dynamic stress on the dynamic characteristics of the subway tunnel near the sand field in shenyang area.The following contents are mainly studied:(1)Through resonant column test,the dynamic shear modulus and damping ratio of saturated sand,explores the dynamic shear modulus and damping ratio and the relationship between the dynamic shear strain,and confining pressure on the dynamic shear modulus and damping ratio of saturated sand.(2)Through dynamic triaxial tests of saturated sandy soil cumulative plastic strain and cumulative pore pressure,and mainly studies the confining pressure,density,frequency,consolidation ratio and dynamic stress on saturated sand accumulation of plastic deformation and the effect of cumulative pore pressure.(3)Through the existing cumulative plastic deformation model and the cumulative pore pressure model fitting and comparison with experimental data,the accumulation of soil deformation field in shenyang area has been established model and the cumulative pore pressure model,the model parameters are also determined.