Abstract: During the deep excavations in the high groundwater area, the piping hazards are frequently encountered due to the inadequate dewatering measured or inappropriate supporting structure. If these piping hazards are not promptly remediated or inappropriately treated, the safety of the deep excavation will be jeopardized and excessive deformation the supporting structure might affect the stability of adjacent buildings and other structures and even induces the loss of properties and human life. This paper presents a groundwater piping within a pipe jacking pit. Factors that might induce the piping were evaluated and the emergency response program was developed with structural supporting, dewatering and the construction monitoring program. The results indicate that these measures were effective.

Key words: pipe jacking pit, bottom piping, structural reinforcement, weep dewatering well, construction monitoring