大厚度湿陷性黄土地基处理及效果研究OA

The compaction pile method is an efficient foundation treatment technology for reinforcing collapsible loess foundations.Currently,the treatment of thick collapsible loess foundations with a thickness exceeding 20 meters remains a technical challenge.This paper takes an industrial project in Ningxia HuiAutonomous Region as a case study and conducts on-site experiments on the compaction pile method for collapsible loess foundations,aiming to systematically evaluate the application effectiveness of lime-soil compaction piles.The experiments were carried out in the thick collapsible loess layer of the site,using 15-meter-long lime-soil compaction piles for foundation treatment,with a pile spacing of 0.8 meters and a hole diameter of 0.4 meters.The self-weight collapsibility coefficient of the soil between the piles and the bearing capacity of the composite foundation were tested after treatment.The experimental results show that the collapsibility of the soil between the piles has been completely eliminated after this treatment;the characteristic value of the foundation bearing capacity has increased from 150 kPa before treatment to 250 kPa,an increase of 66.7%,meeting the design requirement of 200 kPa.This study confirms that the lime-soil compaction pile technology has a good application effect in thick collapsible loess foundations.