Bentonite permeation-diffusion-expansive force combined test device and test method thereof

The invention relates to a bentonite permeation-diffusion-expansive force combined test device and a test method thereof, and belongs to the technical field of geotechnical engineering test instruments, and the bentonite permeation-diffusion-expansive force combined test device comprises a soil body lateral confinement device, a temperature control device, a diffusion device and a permeation device. By adopting the bentonite permeation-diffusion-expansive force combined test device and the test method thereof disclosed by the invention, a permeation-diffusion-expansive force continuous test in a temperature control state can be realized; the method can effectively test and evaluate the evolution law of core retardation parameters such as permeation, diffusion and expansion of the high-compaction bentonite under the thermal-chemical action, and further provides a basis for design and evaluation of a buffer material of a high-level radioactive waste deep geological repository. 本发明涉及一种膨润土渗透-扩散-膨胀力的组合试验装置及其试验方法，其