Experimental Study Of Temperature Field Monitoring In Similar Material Model

The temperature field is an essential component in the rock mass existing environment with the underground construction or resource exploitation shift into the depths, it became an inneglectable factor in rock mechanics research, which made the rock mass multi-field coupling issue a hotspot in this area. The similar material model test is the conventional method of rock mechanics that was widely used to slope, geology, tunneling, and mining engineering. But in the model test, the distribution of temperature field had been barely considered. Therefore, in order to establish a monitoring system of temperature field to discover the temperature distribution in the similar material model, not only is beneficial to the validity of model test but also provide an approach to solve the rock mechanics or rock engineering problem under complex and multi-field coupling situation.This paper introduced a monitoring method of temperature field and its system in the model test study. A distribution relation of temperature field and moisture content was derived based on the heat transfer theory and thermal properties of similar material. A similar material specimen test was carried out to obtain the temperature history in the curing process of model construction, which lay a foundation for the temperature monitoring in the model test. The distribution optical fiber sensing of Raman scattering technology were introduced to build the temperature monitoring system of distribution optical fiber sensing. The basic performance indexed of this monitoring system were calibrated at first, and it shows that the system is suitable for temperature measuring.Where after, a DOFS based temperature monitoring system was implemented into a similar material model test, there were built a plain and a stereo model. Before the test, a demarcation experiment of the optical fiber system was carried out. The study shows that the Raman scattering based distributed optical fiber sensing realizes the temperature monitoring of the similar material model. The distribution law of the temperature field in the model was discovered during the model curing process. And the corresponding relationship between the temperature field distribution and the curing status of the plain model was obtained, which provide a scientific basis to multi-field coupling study of the model test. A curing status prediction of stereo model is set up based on the temperature monitoring experiments of the similar material specimen and the plain model. And this study also provide a temperature compensating method of the similar material model test.