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Gold Science and Technology ›› 2021, Vol. 29 ›› Issue (6): 834-842.doi: 10.11872/j.issn.1005-2518.2021.06.104

• Mining Technology and Mine Management • Previous Articles     Next Articles

Study on Mode Ⅰ and Mode Ⅱ Fracture Characteristics of Granite Under Different Thermal Shock Process

Xiaodong FAN1(),Xiang LI1,2(),Ming TAO1,Tubing YIN1,Xibing LI1   

  1. 1.School of Resources and Safety Engineering, Central South University, Changsha 410083, Hunan, China
    2.School of Civil Engineering, Sun Yat-sen University, Zhuhai 519082, Guangdong, China
  • Received:2021-07-28 Revised:2021-10-03 Online:2021-12-31 Published:2022-03-07
  • Contact: Xiang LI E-mail:Xiaodong_Fan2021@163.com;lixiang85@mail.sysu.edu.cn

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Abstract:

In the high temperature related disasters occurring in rock engineering，the effect of rapid cooling （thermal shock） can’t be ignored.Therefore，the study on mode Ⅰ and mode Ⅱ fracture toughness of granite under different degrees of thermal shock can provide theoretical basis and technical support for the stability analysis of rock engineering after thermal shock disasters.In this experiment，the granite is heated to the target temperature （200 ℃，400 ℃，600 ℃）.According to the characteristics of low freezing point of calcium chloride solution，calcium chloride solution is used as refrigerant，and refrigerants of -20 ℃，20 ℃ and 60 ℃ are obtained by means of freezing and heating respectively，and thermocouple thermometer is used to ensure that the temperature of refrigerating liquid reached the set temperature.Use refrigerants （-20 ℃，20 ℃，60 ℃） for three different cooling rate of the high temperature granite processing，namely the three different levels of thermal shock.The physical properties of the samples are measured before and after heat treatment，including dry density，porosity and P wave velocity.In the end，mode Ⅰ and mode Ⅱ fracture toughness of specimens is tested by Brazilian splitting test.The experimental results show that the dry density and P-wave velocity of heated granite samples decrease with the increase of cooling rate，while the porosity increases with the increase of cooling rate.These phenomena are related to the opening and expansion of pores and micro-cracks caused by thermal shock，that is，more violent thermal shock will cause more serious damage to granite.In addition，with the increase of heating temperature，the sensitivity of the physical properties of heated granite to the temperature change of refrigeration liquid decreases during the cooling process.In terms of fracture toughness，the fracture toughness of granite as a whole decreases significantly with the increase of heating temperature.In addition，at the same high temperature level，the mode Ⅰ and mode Ⅱ fracture toughness of heated granite decreases linearly with the decrease of cooling liquid temperature，which is roughly the same as the change trend of physical properties of granite.The main causes of thermal shock damage are the non-uniform expansion and contraction of minerals inside the rock and the disharmony of deformation caused by the temperature gradient inside and outside the rock.The tensile stress generated by the temperature gradient inside and outside the rock is positively correlated with the temperature difference between granite and refrigerant.

Key words: granite, thermal shock, refrigerant fluid, cooling rate, fracture toughness, temperature gradient

CLC Number: 

  • TD853

Fig.1

Granite specimen"

Fig.2

Schematic diagram of heat treatment process"

Table 1

Physical and mechanical properties of granite after different degrees of thermal shock"

试样温度/℃制冷液温度/℃干密度/（kg·m-3）孔隙率/%纵波波速/（m·s-1）Ⅰ型断裂韧度/（MPa·m0.5）Ⅱ型断裂韧度/（MPa·m0.5）
25-2 638.140.6644 272.88--
200-202 634.380.6964 059.680.9731.418
202 638.090.6564 331.961.0201.438
602 642.630.6034 557.401.0701.449
400-202 616.871.3132 802.470.4040.586
202 621.391.2882 877.780.4240.709
602 625.661.2682 935.610.4510.772
600-202 547.113.7761 461.490.0740.159
202 549.223.7521 481.300.0800.160
602 552.393.7351 504.760.0860.161

Fig.3

Fracture toughness test"

Fig.4

Variation trend of granite physical properties after different degrees of thermal shock"

Fig.5

Fracture toughness of granite after different degrees of thermal impact"

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