Effect of Thermal Shock on the Dynamic Tensile Mechanical Behavior of Granite
Received date: 2020-08-31
Revised date: 2020-12-30
Online published: 2021-10-08
Under certain conditions，such as the drilling surrounding rock cooled by drilling fluid in geothermal development，the surrounding rock rapid cooled in the process of extinguishing the fire，rock in rock mass engineering will experience rapid temperature change（thermal shock）.Therefore the study of thermal shock in rocks is of great significance for stability analysis of rock structure affected by thermal shock.Granite specimens were heated to the high temperatures of 200 ℃，400 ℃ and 600 ℃，and then cooled by three methods of water cooling，air cooling and cooling in the stove.The physical properties such as dry density，P-wave velocity，porosity of granite after distinctive thermal shock were measured.The dry density and porosity were measured with buoyancy techniques.The P-wave velocity was measured by a non-destructive ultrasonic detector.As the heating level and cooling rate rise，the dry density and P-wave velocity present a descending trend，and the porosity presents an ascending trend.The damage degree of granite increases with the increase of heating temperature and cooling rate.The dynamic tensile tests were performed on the specimens after distinctive thermal shock treatment utilizing the split Hopkinson pressure bar system.The dynamic tensile strength of granite heated at 600 ℃ is less than that of granite heated at 400 ℃ and 200 ℃，and the dynamic tensile strength of water-cooled granite is less than that of air-cooled and stove-cooled granite.The damage degree of the granite caused by thermal shock was analyzed by the crack morphology of the specimens recorded by high-speed photography during the tensile failure and the morphology of the broken pieces after failure.The results show that the damage degree of granite increases with the increase of heating level and cooling rate.Scanning electron microscopy （SEM） was used to identify the microcosmic damage and fracture characteristics of granite caused by thermal shock.There are two kinds of characteristic fracture morphology of thermal shock were observed on the specimens after heated at 400 ℃ and 600 ℃ （both air-cooled and water-cooled conditions）.However，neither fracture morphology can be found at 200 ℃ （including 3 kinds of cooling conditions）.Therefore，there is no thermal shock at 200 ℃；When the heating level reaches 400 ℃，the granite is damaged by high temperature and thermal shock.When the heating level reaches 600 ℃，the granite is badly damaged.And the damage degree of granite increases with the increase of heating temperature and cooling rate.This study can provide theoretical basis for the analysis of thermal shock damage and the evaluation of rock mass stability after high temperature disaster in practical engineering.
Baijin LI , Xiang LI , Yan WANG , Tubing YIN , Xibing LI . Effect of Thermal Shock on the Dynamic Tensile Mechanical Behavior of Granite[J]. Gold Science and Technology, 2021 , 29(4) : 545 -554 . DOI: 10.11872/j.issn.1005-2518.2021.04.156
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