Experimental Research on PTC Control Technology of Widening Subgrade Differential Settlement 

Pan TONG

Chongqing Jiaotong University, Chongqing, 400074, China 

Abstract: This paper aims at improving after the new and old roadbed widening subgrade uneven settlement problem, using the geotechnical centrifuge experimental simulation control technology on the new and old embankment with pile composite foundation in different conditions of subgrade differential settlement influence. The test results show that the subgrade widening, pile treatment can not only greatly reduce the new and old subgrade uneven settlement and subgrade settlement can accelerate the stability of pile treatment technology can be used for settlement of high requirements and short construction period of the project, but pile treatment technology will also be penetrated into the phenomenon, can effectively alleviate the cap. In addition, through the geotechnical centrifuge experiments also showed that the treatment of subgrade widening for pile foundation soil settlement, settlement package reinforced area and the underlying stratum, the settlement of reinforced area accounted for 70%, accounting for 30% of settlement of substratum. 

Keywords: Widening subgrade; Uneven settlement; Geotechnical centrifuge; Pipe pile