ballast pocket meaning in Chinese

混凝土中道碴窝

The expansion soil on yangan railway roadbed cause many diseaseses , such as mud pumping , ballast pocket and settlement and extrusion , etc . when being serious there are too mud on sleeper and roadbed to walk on it , it is hard to keep the size of geometry of the track and often cause the car shaking and influence the security of the driving seriously
由于路基土质所特有的不良的工程性质。使阳安线基床病害十分严重，其中基床翻浆及下沉十分突出，它直接影响到轨道的稳定。使轨道几何尺寸难以保持，经常造成晃车，一到雨季轨道面上及道床上全是泥浆以致无法行走，行车安全受到严重威胁。