Research on Evolution Law of Strength Water Sensitivity of Saline Soil under Water Damage Condition
In recent years,due to the continuous infiltration and erosion of roadbed slope in saline soil area by flood water and salt,the roads in Qaidam Basin is increasingly threatened by water damage.A direct shear test has been carried out for the soil conditions of the saline soil roadbed slope,and the evolution law of the water sensitivity to strength of the saline soil under soaking conditions is studied.Based on the sediment incipient theory,the motion force characteristics of the saline soil particles are analyzed,and the critical incipient shear stress formula of the saline soil on the Golmud-Manya Road is proposed,and the change law of the starting shear stress of the saline soil is analyzed.The results show that:(1)under saturated soaking conditions,the shear strength of saline soil varies significantly with different soaking time.The shear strength and parameters of saline soil decrease significantly with the increase of soaking time.(2)Under saturated soaking conditions,the shear strength increases with the increase of dry density.With the addition of NaCl,the thickness of the water film around the soil particles is changed,and the shear strength decreases.With the addition of Na2SO4,the soil absorbs water to form glauberite,fills the pores of the soil,converts the free water into glauberite crystal water,reduces the moisture content of the soil,and increases the shear strength.The research results can provide theoretical basis for the prevention and repair of erosion and water damage of saline soil subgrade slope.
subgrade engineeringprevention and control of water damageshear strength of saline soildirect shear testsalt contentsaturated soaking
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