Method and system for monitoring stability of loess tunnel bottom and construction method

The invention discloses a method and a system for monitoring the stability of the loess tunnel bottom and a construction method. The system comprises a basement and inverted arch contact pressure monitoring subsystem, a pile body stress monitoring subsystem, an inter-pile soil body pore water pressure and water content monitoring subsystem, an inter-pile soil body water content monitoring subsystem, a basement deformation monitoring subsystem, a data collection module and a data analysis software module. According to the system, the conditions of stress, sedimentation, pore water pressure and water content of a tunnel bottom can be well grasped, a reliable basis for distinguishing the stability of a basement is provided, forceful data information for formulating a basement emergency processing scheme is also provided, and thus deficiencies of the traditional specification are filled up, the condition of uncontrolled stability of the loess tunnel bottom is prevented and a forceful analysis basis for ensuring that the basement is in the safe and stable controlled states during construction and operation of the loess tunnel bottom is provided.