多扩头掏挖式基础应用研究

Foundation excavation is a commonly used form the basis of transmission tower foundation，The double expansion head excavation based on bearing capacity and pull down the bearing capacity are better than ordinary single expansion head excavation type foundation have varying degrees of increase。For more expanding head based finite element simulation of excavation base, calculate the ordinary pile, double expansion head, pull and press on the bearing capacity of pile head.Through comparative analysis of calculation results, select the optimal expansion head out of the engineering quantity, size and location,namely double expansion head, such as expanding on the head and head located in the base of the upper, and embedded depth of not less than 1/3 h.On the basis of the engineering geological conditions, total depth, bottom diameter, column diameter, certain forms the basis of the new - double expansion head excavation type is based on the special form the basis of worthy of popularizing.