Abstract Summary
The increasing energy demand and the limited fossil fuel resources make searching for new sustainable clean energy sources. In this regard, it is vital to use energy geo structures as a renewable and clean energy source. It was reported by many researchers that the engineering properties of clayey soils change at high temperatures. Therefore, there is a need for soil materials that can maintain their long-term engineering properties under high temperatures. Bo-rates are naturally occurring minerals. In the present study, it was tried to improve the compressibility behavior of bentonite by adding colemanite under high temperature.