The invention belongs to the field of research of buffer material multi-field
coupling performances in high-level waste geological disposal and in particular relates to a sensor arrangement structure and a method in a buffer material multi-field
coupling experiment bench. The invention aims to provide necessary conditions for successfully constructing a buffer material thermal-water-force-chemical multi-field
coupling large experiment bench and indicating behaviors of the buffer material under the multi-field coupling condition. According to the structure and the method, three different monitoring areas are divided in a compacted
bentonite block layer from bottom to top according to the position of a heater in the experiment bench, different monitoring
layers are finely divided in each monitoring area, and the monitoring
layers are perpendicular to a cross section of a
vertical axis of the experiment bench, wherein two monitoring
layers are divided in a bottom monitoring area, four monitoring layers are divided in a middle monitoring area, two monitoring layers are divided in an upper monitoring area, a displacement sensor needs to penetrate through multiple monitoring layers, and a
soil stress sensor, an interstitial
hydraulic pressure sensor, a temperature sensor, a temperature and
humidity sensor and an
electrochemical corrosion sensor are positioned in the monitoring layers.