含双缺口北山花岗岩的热力耦合断裂特性试验研究

摘要
图/表
参考文献
相关文章 (15)

全文: PDF (1078 KB) HTML (1 KB)
输出: BibTeX | EndNote (RIS)

摘要通过带加载SEM高温试验系统对含双预制缺口北山花岗岩进行原位观察热力耦合破坏试验研究。研究表明，北山花岗岩的矿物成分及花岗岩矿物颗粒粒径差异较大，这些矿物具有不同的热学和力学性质(或硬度)，这将大大影响花岗岩的破坏机制及断裂韧性，热开裂、力诱发微裂纹的萌生、扩展和贯通等受到热力耦合机制的综合影响，并且这些机制反过来也将影响其他的机制，如渗流场及化学场的变化。对于北山花岗岩I型断裂而言，裂纹的扩展主要受到与其垂直方向拉应力的影响，但试件较大的原生缺陷和较大矿物颗粒对花岗岩的断裂路径影响不容忽视。特别是随着温度的变化，花岗岩的断裂机制将发生变化，低温以沿颗粒(沿晶)断裂为主，而高温以沿颗粒(沿晶)和穿颗粒(穿晶)耦合断裂机制为主。试验表明，75 ℃之前花岗岩的平均断裂韧性约为4.728 MPa•mm1/2，而75 ℃之后的平均断裂韧性为3.048 MPa•mm1/2，前后断裂韧性降低了35%左右，这主要是因为温度的升高直接导致热开裂增多，且矿物颗粒之间的胶结作用明显减弱，这逐渐影响了花岗岩的断裂韧性，进而将影响其渗流场和化学场，可见高放核废料储库设计中温度的影响不容忽视。

	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

关键词 ：岩石力学, 热力耦合, 北山花岗岩, 扫描式电子显微镜(SEM), 细观断裂机制, 断裂韧性

Abstract：In-situ experimental investigations on thermal-mechanical coupled effects on physical and mechanical behavior of Beishan granites have been carried out through high temperature scanning electron microscope(SEM) testing system. Studies have clearly indicated that both mineral composition and mineral particle size are quite different for Beishan granite；and they have different thermal and mechanical properties(or hardness)，which greatly affect the failure mechanism and fracture toughness of granite. Thermal cracking，the initiation，propagation and coalescence of microcracks are greatly affected by thermal-mechanical coupled mechanism. In addition，these mechanisms will in turn affect other mechanisms，such as variations of seepage and chemical fields. For model I crack sample of Beishan granite，the crack propagation direction is proximately perpendicular to the direction of tensile stress. In addition，the initial defects and larger mineral particles have also greatly affected the granite fracture path. Especially with the temperature changing，granite fracture mechanism will change from the boundary(intergranular) fracture mechanism at low temperature to the coupled mechanism of boundary(intergranular) and grain(transgranular) fracture. Experimental data also show that the average fracture toughness of Beishan granite before 75 ℃ is about 4.728 MPa•mm1/2，while approximately 3.048 MPa•mm1/2 after 75℃，which deceases about 35%. The main reasons are due to the increasing thermal cracking with the increasing temperature and loads，which lead directly to the increasing microcrack and the decreasing cementation of mineral particles. All of these gradually affect the fracture toughness of granite. In addition，they will affect the seepage and chemical fields. Therefore，the thermal-mechanical coupling effects should not be ignored in nuclear waste repository design.

Key words： rock mechanics thermal-mechanical coupling effects Beishan granite scanning electron microscope (SEM) meso-fracture mechanism fracture toughness

收稿日期: 2011-10-17

引用本文:

左建平1，2，周宏伟1，2，方园1，黄亚明1. 含双缺口北山花岗岩的热力耦合断裂特性试验研究[J]. 岩石力学与工程学报, 2012, 31(4): 738-745.
ZUO Jianping 1，2，ZHOU Hongwei1，2，FANG Yuan1，HUANG Yaming1. EXPERIMENTAL RESEARCH ON FRACTURE CHARACTERISTICS OF DOUBLE-NOTECHED BEISHAN GRANITE UNDER THERMAL- MECHANICAL COUPLING EFFECTS. , 2012, 31(4): 738-745.

链接本文:

http://www.rockmech.org/CN/Y2012/V31/I4/738

[1]	http：//www.world-nuclear.org. " target="_blank">
[7]	中国岩石力学与工程学会废物地下处置专业委员会. 中国岩石力学与工程学会废物地下处置专业委员会成立大会暨首届学术交流大会论文集[C]. 北京：[s. n.]，2006.(Chinese Underground Waste Disposal Committee of Chinese Society of Rock Mechanics and Engineering. Inaugural Conference of Chinese Underground Waste Disposal Committee of Chinese Society of Rock Mechanics and Engineering and the First Academic Exchange Conference. Beijing：[s. n.]，2006.(in Chinese)) " target="_blank">
[9]	中国岩石力学与工程学会废物地下处置专业委员会. 第三届废物地下处置学术研讨会论文集[C]. 杭州：[s. n.]，2010.(Chinese Underground Waste Disposal Committee of Chinese Society of Rock Mechanics and Engineering. The 3rd Academic Exchange Conference of Chinese Underground Waste Disposal Committee. Hangzhou：[s. n.]，2010.(in Chinese)) " target="_blank">
[12]	刘月妙，王驹，谭国焕，等. 高放废物处置北山预选区深部完整岩石基本物理力学性能及时温效应[J]. 岩石力学与工程学报，2007，26(10)：2 034-2 042.(LIU Yuemiao，WANG Ju，THAM L G，et al. Basic physico-mechanical properties and time-temperature effect of deep intact rock from Beishan pre-selected area for high-level radioactive waste disposal[J]. Chinese Journal of Rock Mechanics and Engineering，2007，26(10)：2 034-2 042.(in Chinese)) " target="_blank">
[14]	周宏伟，谢和平，左建平. 深部高地应力下岩石力学行为研究进展[J]. 力学进展，2005，35(1)：91-99.(ZHOU Hongwei，XIE Heping，ZUO Jianping. Developments in researches on mechanical behaviors of rocks under the condition of high ground pressure in the depths[J]. Advances in Mechanics，2005，35(1)：91-99.(in Chinese))
[20]	中国航空研究院. 应力强度因子手册[M]. 北京：科学出版社，1981：188-189.(Chinese Aeronatatical Establishment. Handbook of stress intensity factor[M]. Beijing：Science Press，1981：188-189.(in Chinese)) " target="_blank">
[4]	HELEN W. Rock Solid？A scientific review of geological disposal of high-level radioactive waste(GeneWatch UK consultancy report)[R]. Derbyshire，England：[s.n.]，2010 " target="_blank">
[15]	左建平，周宏伟，谢和平，等. 温度和应力耦合作用下砂岩破坏的细观试验研究[J]. 岩土力学，2008，29(6)：1 477-1 482.(ZUO Jianping，ZHOU Hongwei，XIE Heping，et al. Meso-experimental research on the sandstone failure behavior under thermal-mechanical coupling effect[J]. Rock and Soil Mechanics，2008，29(6)：1 477-1 482. (in Chinese)) " target="_blank">
[18]	ZUO J P，XIE H P，ZHOU H W，et al. Thermal-mechanical coupled effect on fracture mechanism and plastic characteristics of sandstone[J]. Science in China Series E：Technological Sciences，2007，50(6)：833-843.(in Chinese))
[2]	国家发展和改革委员会. 核电中长期发展规划(2005～2020年)[R]. [S.l.]：[s.n.]，2007.(State Development and Reform Commission. Mid-long term development plan for nuclear power(during 2005-2020)[R]. [S.l.]：[s.n.]，2007.(in Chinese)) " target="_blank">
[17]	左建平，谢和平，周宏伟，等. 不同温度作用下砂岩热开裂的试验研究[J]. 地球物理学报，2007，50(4)：1 150-1 155.(ZUO Jianping，XIE Heping，ZHOU Hongwei，et al. Experimental research on thermal cracking of sandstone under different temperatures[J]. Chinese Journal of Geophysics，2007，50(4)：1 150-1 155.(in Chinese)) " target="_blank">
[3]	International Atomic Energy Agency(IAEA). IAEA-TECDOC-1243：The use of scientific and technical results from underground research laboratory investigations for the geological disposal of radioactive waste[M]. Vienna，Austria：International Atomic Energy Agency (IAEA)，2001：3-8. " target="_blank">
[5]	HUDSON J A. Lesson learned from 20 years of UK rock mechanics research for radioactive waste disposal[J]. International Society For Rock Mechanics News Journal，1999，6(1)：27-41. " target="_blank">
[6]	LEE S Y，SINDELAR R L. Thermal analysis of repository codisposal waste packages containing aluminum spent nuclear fuel(U)[R]. Aiken，USA：Westinghouse Savannah River Company，1998. " target="_blank">
[8]	中国岩石力学与工程学会废物地下处置专业委员会. 第二届废物地下处置学术研讨会论文集[C]. 甘肃：[s.n.]，2008.(Chinese Underground Waste Disposal Committee of Chinese Society of Rock Mechanics and Engineering. The 2nd Academic Exchange Conference of Chinese Underground Waste Disposal Committee. Gansu：[s.n.]，2008.(in Chinese)) " target="_blank">
[10]	杨春和，王贵宾，王驹，等. 甘肃北山预选区岩体力学与渗流特性研究[J]. 岩石力学与工程学报，2006，25(4)：825-832.(YANG Chunhe，WANG Guibin，WANG Ju，et al. Study of rock mass mechanics and seepage characteristics of candidate site-Beishan，Gansu Province[J]. Chinese Journal of Rock Mechanics and Engineering，2006，25(4)：825-832.(in Chinese))
[11]	杨春和，梅涛，王贵宾，等. 甘肃北山芨芨采石场岩体节理特征研究[J]. 岩石力学与工程学报，2007，26(增2)：3 849-3 854.(YANG Chunhe，MEI Tao，WANG Guibin，et al. Study of rock mass joint characteristics of Jiji Quarry in Beishan，Gansu Province[J]. Chinese Journal of Rock Mechanics and Engineering，2007，26(Supp.2)：3 849-3 854.(in Chinese)) " target="_blank">
[13]	李亚萍，许建东，于红梅. 甘肃北山花岗岩裂隙几何学特征研究及岩石质量初探[J]. 地震地质，2006，28(1)：129-138.(LI Yaping，XU Jiandong，YU Hongmei. Geometrical characteristics of fractures and rock quality assessment in granite in the Beishan area，Gansu Province[J]. Seismology and Geology，2006，28(1)：129-138.(in Chinese))
[16]	左建平，周宏伟，谢和平. 不同温度影响下砂岩的断裂特性研究[J]. 工程力学，2008，25(5)：124-130.(ZUO Jianping，ZHOU Hongwei，XIE Heping. Fracture characteristics of sandstone under thermal effects[J]. Engineering Mechanics，2008，25(5)：124-130.(in Chinese)) " target="_blank">
[19]	左建平，周宏伟，方园，等. 甘肃北山地区深部花岗岩的热开裂试验研究[J]. 岩石力学与工程学报，2011，30(6)：1 107-1 115. (ZUO Jianping，ZHOU Hongwei，FANG Yuan，et al. Experimental research on thermal cracking of deep granite in Beishan region，Gansu Province[J]. Chinese Journal of Rock Mechanics and Engineering，2011，30(6)：1 107-1 115.(in Chinese)) " target="_blank">