LABORATORY AND IN-SITU TESTS ON SOLIDIFIED SALINE SOILS FOR HIGHWAY FILLINGS

Road embankments in west coastal area of Bohai gulf are mainly fill embankment.The fill materials are mainly saline soil.When using saline soil for filling,it should be treated by modification and solidification to solve the weaker strength and stability due to the expansion,depression and serious water absorption of saline soil.More inorganic materials and fewer polymer materials are suitable for a reasonable construction budget.Some tests on saline soil with lime and saline soil with lime and SH agent are carried out.The tests include unconfined compression strength,tensile strength,triaxial shear strength,and CBR in laboratory,as well as degree of compaction,flattening degree,rebound deflection,CBR,and rebound modulus in-situ.The test purposes is to study the mechanical properties of solidified saline soils used for highway embankment fillings simultaneously.The test results indicate that (1)Mechanical indices of two solidified soils meet the requirements on highway fillings.The strength of saline soil with lime and SH agent is better than that of saline soil with lime.(2)SH agent brings about anti-water connection between soil particles,and forms lots of the wire-like connecting network in pores after drying.So anti-deformation and strength in air and water of the solidified soil are increased.(3)It is noted that compaction effort in-situ is well.The test results of the solidified soils are corresponding in the condition of laboratory and in-situ.The compaction and mechanical properties of saline soil with lime and SH agent satisfy the requirements of highway specification and are of a suitable treatment measure and have well using objective in the coastal area.