温度影响下花岗岩宏、细观力学性质演化规律

doi:10.11872/j.issn.1005-2518.2022.06.041

Abstract

Abstract:

In many underground engineering construction，the temperature change has a great impact on the macro mechanical properties of rock mass.The macro mechanical properties of the rock mass are closely related to the development and damage of micro cracks.In order to explore the relationship between meso damage mechanism and macro mechanical properties under the condition of temperature cycling，the granite was tested with different cold and heat cycles under five temperature conditions of 200，300，400，500 and 600 ℃，and then the micro pore parameters were detected by low field NMR（nuclear magnetic resonance） system.The macro uniaxial compressive strength of granite specimens under different temperature conditions was tested by universal hydraulic testing machine.Finally，through the fitting analysis of macro mechanical properties and damage parameters，as well as the correlation detection and analysis of meso parameters and macro parameters，the evolution relationship between micro pore fracture parameters and mechanical properties of granite under the condition of temperature cycle was studied.The results show that：（1）The increase of temperature and the number of cold and hot cycles will lead to the decrease of mechanical properties such as elastic modulus and uniaxial strength of granite，and the influence of cold and hot cycles on the decrease of rock strength after 400 ℃ is more obvious.（2）Nuclear magnetic testing can effectively obtain the pore distribution parameters of specimens under different temperatures.Combined with the changes of meso parameters and macro properties，it can be concluded that when the temperature is below 400 ℃，the micro cracks and damage formed in the rock are mainly caused by factors such as water overflow and internal stress concentration，while when the temperature is higher than 400 ℃，the micro cracks are mainly formed by mineral crystal creep and crystal denaturation，and at this time，a large-scale fracture group will be formed.（3）The damage value of granite increases with the increase of temperature，but the multiple damage caused by cold thermal cycle increases first and then decreases with the increase of temperature.The correlation parameter between the size of micro cracks in granite and the uniaxial compressive strength of the specimen is -0.943，and the correlation parameter between the content of micro cracks and the strain of the specimen is 0.935.

Key words: temperature field, temperature cycle, damage variables, fracture scale, fissure content, strength characteristics

CLC Number:

TD315

Guangsheng DU,Shijiang CHEN,Hailong WU. Evolution of Macro and Meso Mechanical Properties of Granite Under the Influence of Temperature[J].Gold Science and Technology, 2022, 30(6): 935-947.

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循环次数 /次	温度梯度及试样编号
循环次数 /次	200 ℃	300 ℃	400 ℃	500 ℃	600 ℃
2	200-2	300-2	400-2	500-2	600-2
4	200-4	300-4	400-4	500-4	600-4
6	200-6	300-6	400-6	500-6	600-6
8	200-8	300-8	400-8	500-8	600-8
10	200-10	300-10	400-10	500-10	600-10

循环次数/次	不同温度条件下花岗岩试件弹性模量值
循环次数/次	200 ℃	300 ℃	400 ℃	500 ℃	600 ℃
2	23.53	19.04	13.25	7.55	3.13
4	21.47	17.26	11.88	6.96	2.11
6	21.41	17.09	10.10	5.33	1.89
8	20.94	15.68	8.98	4.43	0.38
10	20.49	14.21	8.88	3.54	0.37

循环次数/次	不同温度条件下试件损伤变量值
循环次数/次	200 ℃	300 ℃	400 ℃	500 ℃	600 ℃
2	0.1207	0.2885	0.5049	0.7178	0.8830
4	0.1977	0.3550	0.5561	0.7399	0.9212
6	0.1999	0.3614	0.6226	0.8008	0.9294
8	0.2175	0.4141	0.6644	0.8345	0.9858
10	0.2343	0.4694	0.6682	0.8677	0.9859

温度工况	单轴抗压强度/MPa	应变/%	T_d/（n/a）	T_n/ms
200-2	104.82	0.477	77.504	22.241
200-4	109.52	0.537	109.698	30.041
200-6	109.16	0.536	144.811	31.371
200-8	115.06	0.560	126.038	25.261
200-10	105.49	0.516	144.811	35.983
300-2	98.90	0.478	191.164	29.931
300-4	111.62	0.569	191.164	36.240
300-6	88.34	0.488	191.164	33.045
300-8	86.54	0.541	204.907	33.829
300-10	86.93	0.543	270.496	34.615
400-2	85.96	0.604	289.942	39.848
400-4	94.02	0.704	310.786	54.052
400-6	86.79	0.806	382.749	55.569
400-8	88.18	0.864	410.265	57.884
400-10	74.49	0.791	439.760	55.722
500-2	72.69	0.908	439.760	62.122
500-4	72.75	0.954	410.265	73.637
500-6	65.25	1.095	580.522	112.459
500-8	56.47	1.114	580.522	135.556
500-10	48.77	1.224	622.257	155.082
600-2	60.61	1.637	580.522	162.011
600-4	31.71	1.455	666.992	188.872
600-6	35.71	1.766	580.522	192.529
600-8	8.92	2.202	880.488	516.347
600-10	9.58	2.328	666.992	479.786

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Evolution of Macro and Meso Mechanical Properties of Granite Under the Influence of Temperature

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