不同热处理作用下花岗岩纵波波速和导热能力的演化规律分析

doi:10.13722/j.cnki.jrme.2021.0532

摘要
图/表
参考文献
相关文章 (15)

全文: PDF (7215 KB) HTML (1 KB)
输出: BibTeX | EndNote (RIS)

摘要在地热能源开采过程中，温度对高温岩石的物理特性有着显著的影响，尤其是高温花岗岩遇水冷却后导热特性会发生很大的变化。为进一步研究温度和冷却方式对高温花岗岩物理特性的影响，开展高温花岗岩自然冷却和遇水冷却试验，通过对其质量、体积、密度和波速等常规物理特性以及导热特性的测试，对比分析2种冷却方式下的物理参数变化规律。结果表明：质量损失率、体积增加率、密度变化率和波速衰减率随温度的升高呈指数型增加，当温度T = 450 ℃时，花岗岩的物理特性变化率显著增加。遇水冷却能够增大花岗岩微裂纹密度，导致其物理特性进一步变化。热处理后花岗岩的导热系数随温度(25 ℃～1 050 ℃)升高呈非线性降低，由3.41 W/(m·K)降至0.96 W/(m·K)，降低了72.85%。热处理后花岗岩的导热系数与其质量损伤率、体积增加率和波速衰减率成负相关，可以用指数函数来表示。对比各物理参数的改性系数发现，在敏感性方面：纵波波速＞导热系数＞密度，因此纵波波速可以优先作为衡量花岗岩热损伤的指标参数。

	服务

	把本文推荐给朋友
	加入我的书架
	加入引用管理器
	E-mail Alert
	RSS
	作者相关文章
	吴星辉1
	2
	3
	蔡美峰1
	2
	3
	任奋华1
	2
	3
	孙景来4
	郭奇峰1
	2
	3
	武旭4
	张杰1
	2
	3
	张利伟1
	2
	3

关键词 ：岩石力学, 高温花岗岩, 地热开采, 冷却方式, 纵波波速, 导热特性

Abstract：In the exploitation process of geothermal energy，the temperature has a significant impact on the physical properties of dry hot rock，especially the thermal conductivity of high-temperature granite after water cooling. In order to investigate the influence of the temperature and the cooling mode on the physical properties of high-temperature granite，the air-cooling and water-cooling experiments of high-temperature granite are carried out in this paper. Through investigating the conventional physical properties such as mass，volume，density and P-wave velocity as well as the thermal conductivity，the change rules of the parameters by the two cooling methods are compared and analyzed. The results show that the mass loss rate，volume increase rate，density change rate and P-wave velocity decay rate increase exponentially with the temperature. When T = 450 ℃，the change rate of granite physical properties increases significantly. Water-cooling increases the density of micro-cracks in granite，which causes further changes in the physical properties of granite. After thermal treatment，the thermal conductivity of granite decreases non-linearly by 72.85% from 3.41 W/(m·K) to 0.96 W/(m·K) with increasing the temperature from 25 ℃ to 1 050 ℃. The thermal conductivity of granite after thermal treatment is inversely related to the mass damage rate，volume increase rate and P-wave velocity decay rate in an exponential form. Comparing the physical parameters，it is found that P-wave velocity is most sensitive to the temperature，followed by the thermal conductivity and the density. Therefore，P-wave velocity can be used preferentially as an index parameter to measure the thermal damage of granite.

Key words： rock mechanics high-temperature granite geothermal extraction cooling method P-wave velocity thermal conductivity

引用本文:

吴星辉1，2，3，蔡美峰1，2，3，任奋华1，2，3，孙景来4，郭奇峰1，2，3，武旭4，张杰1，2，3，张利伟1，2，3. 不同热处理作用下花岗岩纵波波速和导热能力的演化规律分析[J]. 岩石力学与工程学报, 2022, 41(3): 457-467.
WU Xinghui1，2，3，CAI Meifeng1，2，3，REN Fenhua1，2，3，SUN Jinglai4，GUO Qifeng1，2，3，WU Xu4，ZHANG Jie1，2，3，ZHANG Liwei1，2，3. Evolutions of P-wave velocity and thermal conductivity of granite under different thermal treatments. , 2022, 41(3): 457-467.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0532 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/I3/457

[2]	谢和平，高峰，鞠杨，等. 深地煤炭资源流态化开采理论与技术构想[J]. 煤炭学报，2017，42(3)：547-556.(XIE Heping，GAO Feng，JU Yang，et al. Theoretical and technological conception of the fluidization mining for deep coal resources[J]. Journal of China Coal Society，2017，42(3)：547-556.(in Chinese))
[4]	MAHMUTOGLU Y. Mechanical behaviour of cyclically heated fine grained rock[J]. Rock Mechanics and Rock Engineering，1998，31(3)：169-179.
[6]	PENG J，RONG G，CAI M，et al. Physical and mechanical behaviors of a thermal-damaged coarse marble under uniaxial compression[J]. Engineering Geology，2016，200(12)：88-93.
[7]	BAUER S，JOHNSON B. Effects of slow uniform heating on the physical properties of Westerly and Charcoal granites[J]. U.S. Symposium on Rock Mechanics，1979，1(1)：7-18.
[10]	LIMA J，PARAGUASSú A. Linear thermal expansion of granitic rocks：Influence of apparent porosity，grain size and quartz content[J]. Bulletin of Engineering Geology and the Environment，2004，63(3)：215-220.
[12]	CHEN S，YANG C，WANG G. Evolution of thermal damage and permeability of Beishan granite[J]. Applied Thermal Engineering，2017，110(1)：1 533-1 542.
[14]	LIU S，XU J. Mechanical properties of Qinling biotite granite after high temperature treatment[J]. International Journal of Rock Mechanics and Mining Sciences，2014，71(1)：188-193.
[17]	徐小丽，高峰，沈晓明，等. 高温后花岗岩力学性质及微孔隙结构特征研究[J]. 岩土力学，2010，31(6)：1 752-1 758.(XU Xiaoli，GAO Feng，SHEN Xiaoming，et al. Research on mechanical characteristics and micropore structure of granite under high-temperature[J]. Rock and Soil Mechanics，2010，31(6)：1 752-1 758.(in Chinese))
[20]	RAY L，BHATTACHARYA A，ROY S. Thermal conductivity of higher Himalayan Crystallines from Garhwal Himalaya，India[J]. Tectonophysics，2007，434(1)：71-79.
[22]	CHO W，KWON S. Estimation of the thermal properties for partially saturated granite[J]. Engineering Geology，2010，115(1)：132-138.
[24]	GAO P，ZHANG Y，YU Z，et al. Correlation study of shallow layer rock and soil thermal physical tests in laboratory and field[J]. Geothermics，2015，53(1)：508-516.
[8]	KILIC Ö. The influence of high temperatures on limestone P-wave velocity and Schmidt hammer strength[J]. International Journal of Rock Mechanics and Mining Sciences，2006，43(6)：980-986.
[18]	YANG S，RANJITH P G，JING H，et al. An experimental investigation on thermal damage and failure mechanical behavior of granite after exposure to different high temperature treatments[J]. Geothermics，2017，65(1)：180-197.
[27]	张卫强. 岩石热损伤微观机制与宏观物理力学性质演变特征研究[博士学位论文][D]. 徐州：中国矿业大学，2017.(ZHANG Weiqiang. Study on the microscopic mechanism of rock thermal damage and the evolution characteristics of macroscopic physical and mechanical properties—— Taking typical rock as an example[Ph. D. Thesis][D]. Xuzhou：China University of Mining and Technology，2017.(in Chinese))
[28]	ZUO J P，XIE H P，ZHOU H W，et al. SEM in situ investigation on thermal cracking behaviour of Pingdingshan sandstone at elevated temperatures[J]. Geophysical Journal International，2010，181(2)：593-603.
[30]	SUN H，SUN Q，DENG W，et al. Temperature effect on microstructure and P-wave propagation in Linyi sandstone[J]. Applied Thermal Engineering，2017，115(1)：913-922.
[5]	YAVUZ H，DEMIRDAG S S C. Thermal effect on the physical properties of carbonate rocks[J]. International Journal of Rock Mechanics and Mining Sciences，2010，47(1)：94-103.
[15]	QIANG S，WEIQIANG Z，XUE L，et al. Thermal damage pattern and thresholds of granite[J]. Environmental Earth Sciences，2015，74(3)：2 341-2 349.
[25]	高平. 岩石热物性参数分析及多场热效应耦合模型研究[博士学位论文][D]. 长春：吉林大学，2015.(GAO Ping. Analysis of rock thermal physical parameters and research on multi-field thermal effect coupled model[Ph. D. Thesis][D]. Changchun：Jilin University，2015. (in Chinese))
[3]	ZHANG F，ZHAO J，HU D，et al. Laboratory investigation on physical and mechanical properties of granite after heating and water-cooling treatment[J]. Rock Mechanics and Rock Engineering，2018，51(3)：677-694.
[13]	INSERRA C，BIWA S，CHEN Y. Influence of thermal damage on linear and nonlinear acoustic properties of granite[J]. International Journal of Rock Mechanics and Mining Sciences，2013，62(5)：96-104.
[23]	ZHAO Z. Thermal influence on mechanical properties of granite：a microcracking perspective[J]. Rock Mechanics and Rock Engineering，2016，49(3)：747-762.
[1]	闫治国，朱合华，邓涛，等. 三种岩石高温后纵波波速特性的试验研究[J]. 岩土工程学报，2006，28(11)：2 010-2 014.(YAN Zhiguo，ZHU Hehua，DENG Tao，et al. Experimental study on longitudinal wave characteristics of tuff，granite and breccia after high temperature[J]. Journal of Geotechnical Engineering，2006，28(11)： 2 010-2 014.(in Chinese))
[11]	CHAKI S，TAKARLI M，PRINCE W. Influence of thermal damage on physical properties of a granite rock：Porosity，permeability and ultrasonic wave evolution[J]. Construction and Building Materials，2008，22(7)：1 456-1 461.
[21]	PASQUALE V，VERDOYA M，CHIOZZI P. Measurements of rock thermal conductivity with a Transient Divided Bar[J]. Geothermics，2015，53(1)：183-189.
[9]	JOHNSON B，GANGI A F，HANDIN J. Thermal cracking of rock subjected to slow，uniform temperature changes[C]// The 19th US Symposium on Rock Mechanics. Reno，Nevada：University of Nevada，1978：1-9.
[16]	ZHAO Z，LIU Z，PU H，et al. Effect of thermal treatment on Brazilian tensile strength of granites with different grain size distributions[J]. Rock Mechanics and Rock Engineering，2018，51(1)：1 293-1 303.
[19]	HARTMANN A，RATH V，CLAUSER C. Thermal conductivity from core and well log data[J]. International Journal of Rock Mechanics and Mining Sciences，2005，42(7)：1 042-1 055.
[26]	ZHANG F，ZHAO J，HU D，et al. Laboratory investigation on physical and mechanical properties of granite after heating and water-cooling treatment[J]. Rock Mechanics and Rock Engineering，2018，51(3)：677-694.
[29]	孙强，张志镇，薛雷，等. 岩石高温相变与物理力学性质变化[J]. 岩石力学与工程学报，2013，32(5)：935-942.(SUN Qiang，ZHANG Zhizhen，XUE Lei，et al. Physical-mechanical properties variation of rock with phase transformation under high temperature[J]. Chinese Journal of Rock Mechanics and Engineering，2013，32(5)：935-942.(in Chinese))