Study for Key Technology of Metro Deep Foundation Pit Monitor in Loess Region of Northwest China

This paper puts forward main content, the effect, common monitoring means of deep pit engineering based on four years experience of the first metro deep foundation pit monitor in the loess region of Northwest China. This paper introduces the key technology in axial force monitoring, displacement measurement by inclinometer, the layout principles of ground fissures surface points.This paper introduces the monitoring action and monitoring items of shield tunnel. Formation moving characteristics under shield construction and points for attention in monitoring alarm are put forward. This paper puts forward emphatically analyses points for attention and cause of abnormity in rigid supporting axial force monitoring.It is the most common method of internal bracing in the loess region of Northwest China. This paper puts forward that, the influence of temperature action on rigid supporting axial force monitoring can not be neglected.