VISUAL SURROUNDING UNDERGROUND WATER LEVEL MONITORING AND EARLY-WARNING THRESHOLD DESIGN METHOD FOR A DEEP FOUNDATION PIT

摘要

A visual surrounding underground water level monitoring and early-warning threshold design method for a deep foundation pit. An optimized arrangement mode for monitoring wells outside a pit of a monitoring section is provided, such that the variation in the water level outside the pit can be truly reflected; by means of wireless transmission, collection and processing of data, data of the underground water level of a single monitoring well and the monitoring section is visualized, and the variation in the underground water level outside the pit can be intuitively reflected; moreover, an early warning speed ratio ηit parameter of the water level outside the pit is introduced, the characteristics of the variation in the underground water level outside the pit are analyzed, and the principle of mean deviation of mathematical statistics is used, so that a calculation method for a stability abnormal early warning threshold [ηicr] of the early warning speed ratio ηit of the water level outside a deep foundation pit is obtained. According to the design principle of the method, a conventional mode for performing, according to construction experience, arrangement of monitoring wells and reminding by means of an early warning is eliminated, and the method has the characteristics of being intuitive in data, timely in early warning and easy in implementation; moreover, the cost is reduced, the engineering applicability is strong, and the application range is wide.