The ballastless track structure

reknown for its superior geometric stability assurance capability

has significantly contributed to the rise and development of high-speed railway technology. It is a key factor in ensuring the safety and smooth operation of high-speed railway. However

its limited adjustment capacity imposes stringent requirements on the deformation control of the underlying foundation. In recent years

some sites have experienced track upheaval deformation

which disrupt normal high-speed railway operations and present a new technical challenge. Therefore

investigating the heaving of ballastless tracks on high-speed railway subgrades holds important engineering significance. This study begins by systematically summarizing the mechanisms behind subgrade heaving in ballastless tracks

identifying three major contributing factors: foundation lithology

subgrade fill characteristics

and environmental conditions. Next

techniques including rail fastener adjustment and track gradient adjustment methods

are thoroughly reviewed

with their advantages

disadvantages

and applicable conditions outlined. Countermeasures and suggestions for effective prevention of upward deformation in the stages of railway surveying

design

construction

and operation are proposed. Finally

combining with a typical project case of a high-speed railway

the causes of its upheaval deformation; and remediation maintenance strategies are analyzed. The results can provide technical support for the prevention and remediation of upheaval deformation; diseases of high-speed railway subgrades.