Long-term measurement method for balance humidity of roadbed

The invention discloses a long-term measurement method for balance humidity of a roadbed, belongs to the technical field of road engineering, and aims to solve the technical problem that the existing roadbed humidity estimation is inaccurate. According to the technical scheme, the method comprises the steps that a closed humidity sensor device and an open humidity sensor device are embedded in the top of a roadbed layer of the layered compaction roadbed with the compaction degree of 93%, the compaction degree of 94% and the compaction degree of 96% respectively, roadbed soil humidity measurement is carried out once every quarter every year, collection is continuously carried out for several years, and the humidity of the roadbed soil is obtained. By comparing humidity data collected by a closed humidity sensor device and an open humidity sensor device in a roadbed layer corresponding to the compaction degree, the optimal moisture content data of roadbed soil during construction and the moisture content changi