膨胀土硬质地层振动载荷沉桩的挤土效应OA北大核心CSTPCD

In order to study the soil squeezing effect of pile sinking under vibration load in expansive soil layer,based on the mechanical properties of shear expansion and water softening of expansive soil,the key technology of"hydrodynamic method"assisted pile sinking is proposed.Through field test and finite element calculation,the changing rules of deep horizontal displacement and deep soil pressure of the soil around the H-type and O-type steel sheet piles during pile sinking are summarized.The results shows that the deep horizontal displacement and deep soil pressure around the pile are closely related to the properties and depth of soil layer,and the shear expansion of expanding soil can significantly enhance the soil squeezing effect of the pile sinking.Compared with the pile sinking without auxiliary measures,the maximum value of deep horizontal displacement and deep soil pressure around the pile can be reduced by more than 50%when the pile sinking is assisted by"hydrodynamic method".The auxiliary measures of"hydrodynamic method"can significantly reduce the adverse effects of pile sinking on the surrounding environment,which provides important technical support for the design and construction of combined steel sheet pile support technology.