(1. School of Civil Engineering，Central South University，Changsha，Hunan 410075，China；2. National Engineering Laboratory for High Speed Railway Construction，Central South University，Changsha，Hunan 410075，China；3. Nagoya Institute of Technology，Nagoya 466855，Japan)
Abstract：In the fields of nuclear waste landfill，geothermy and deep mining，the effects of temperature on the mechanical behaviors of soft rocks cannot be neglected. A thermo-elasto-plastic model of soft rocks considering structure was proposed based on the super loading yield surface and the concept of temperature-deduced equivalent stress. Compared to the super loading yield surface，only one more parameter is added，i.e.，the linear thermal expansion coefficient. The predicted results and the test results show that the proposed model is capable of describing both the phenomenons of heat-increase and heat-decrease of soft rocks. The stronger the initial structure，the larger the strength of soft rocks. The phenomenons of heat-increase and heat-decrease switch from each other due to the change of the initial structure of soft rocks. Furthermore，no matter whether the heat-increase or heat-decrease，a larger linear thermal expansion coefficient or a greater temperature，always leads to much more rapid dissipation of the structure. When the linear thermal expansion coefficient and temperature are larger at the same time，the dissipation trend will be more obvious. Lastly，the structure dissipates more easily in the case of heat-increase than in the heat-decrease.
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2017, Vol. 36 
