热冲击对花岗岩动态断裂行为的影响研究

doi:10.11872/j.issn.1005-2518.2023.05.036

Abstract

Abstract:

In engineering operations such as geothermal development and utilization in high-temperature rock formations，underground coal gasification，multiple oil extractions，underground disposal of high-level radioactive waste，and protection and restoration of important buildings after fires，rocks often experience thermal shock due to drastic temperature changes.Thermal shock refers to the phenomenon where an object undergoes a large amount of heat exchange in a short time due to rapid heating or cooling，resulting in the generation of thermal shock stress within the object.To investigate the impact of thermal shock on the dynamic fracture behavior of high-temperature granite，the granite was heated to three different temperature levels of 100，300，600 ℃，followed by cooling using three different methods of furnace cooling，air cooling，and water cooling to provide different cooling rates，resulting in varying degrees of thermal shock within the granite samples.The notched semi-circular bend （NSCB） specimens of the granite samples subjected to thermal shock treatment were tested using a split Hopkinson pressure bar （SHPB） system for dynamic fracture behavior.The fracture pattern of the specimens was recorded using a high-speed camera.The results show that with the increase in specimen temperature and cooling rate，the dry density and longitudinal wave velocity of the specimens decrease significantly，and the porosity increase.Under thermal shock，the dynamic fracture toughness value of the specimens decreased significantly.At the same loading rate level，the dynamic fracture toughness value of the water-cooled specimens is lower than that of the air-cooled specimens，indicating that the crack propagation resistance of rock materials decrease when subjected to dynamic impact.Furthermore，at loading rates higher than 130 GPa·m^0.5/s，the effect of thermal shock on fracture toughness is more pronounced.By analyzing the relationship between dynamic fracture toughness and loading rate，a power law function with a good fitting degree is obtained，revealing the impact of thermal shock on dynamic fracture toughness.Therefore，this study provides valuable reference for the stability of rock formations in cooling treatment projects involving high-temperature rocks，contributing to the design and management of engineering operations such as geothermal development and utilization，underground coal gasification，multiple oil extractions，underground disposal of high-level radioactive waste，and protection and restoration of important buildings after fires.

Key words: thermal shock, granite, mode I dynamic fracture toughness, NSCB, cooling method, fracture patterns, SHPB system

CLC Number:

TD315

Weihua WANG, Kai LI, Ruixin HUANG. Study on the Effect of Thermal Shock on Dynamic Fracture Behavior of Granite[J].Gold Science and Technology, 2023, 31(5): 752-762.

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参数	数值	参数	数值
杆径/mm	50	弹性模量/GPa	240
入射杆长度/mm	2 000	泊松比	0.28
吸收杆长度/mm	500	纵波波速/（m·s^-1）	5 400
投射杆长度/mm	1 500	杆密度/（kg·m^-3）	7 800

温度 /℃	炉内冷却		空气冷却		水冷却
温度 /℃	ρ_s	σ	ρ_a	σ	ρ_w	σ
100	3.185	0.0024	3.181	0.0025	3.174	0.0020
300	3.163	0.0046	3.161	0.0053	3.149	0.0018
600	3.125	0.0018	3.114	0.0012	3.101	0.0050

温度 /℃	炉内冷却		空气冷却		水冷却
温度 /℃	V_s	σ	V_a	σ	V_w	σ
100	3 333.43	18.14	3 356.31	45.05	3 167.25	65.46
300	2 793.42	56.80	2 618.81	51.70	2 493.01	57.04
600	1 395.57	17.66	1 338.28	42.94	1 278.82	7.08

温度/℃	炉内冷却		空气冷却		水冷却
温度/℃	P_s	σ	P_a	σ	P_w	σ
100	1.34	0.04	1.37	0.13	1.89	0.19
300	1.47	0.08	1.52	0.24	1.92	0.08
600	1.89	0.08	1.66	0.08	2.23	0.16

冷却方式	温度/℃	a	b	R²
未处理	25	0.369	0.628	0.969
炉内冷却	100	0.259	0.982	0.964
	300	0.463	0.515	0.932
	600	0.182	0.701	0.886
空气冷却	100	0.485	0.941	0.977
	300	0.129	0.759	0.949
	600	0.454	0.479	0.827
水冷却	100	0.270	0.636	0.883
	300	0.265	0.613	0.908
	600	0.123	0.713	0.971

Study on the Effect of Thermal Shock on Dynamic Fracture Behavior of Granite

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