RESEARCH ON THE APPLICATION TECHNOLOGY OF FOLLOW-UP CASING ROTARY EXCAVATION PILE IN GOBI DESERT
Taking the pile foundation project of the elevated bridge for the renovation and expansion of Urumqi Airport as an example,the project is located in the Gobi Desert,where the soil is composed of unevenly graded Gobi materials with poor cohesion,easy expansion of holes,and collapse.The study adopts traditional mud wall protection operation,which has serious mud seepage,causes significant pollution to the formation,and is not environmentally friendly,so it is not suitable.If rotary drilling is used for dry drilling operations,the pile foundation filling coefficient is large,uneconomical,and inefficient.Based on this project,the use of follow-up casing and wall protection rotary drilling construction method effectively solves the problems of large pile foundation filling coeffi-cient and geological pollution.
万方数据
维普
