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黄金科学技术 ›› 2021, Vol. 29 ›› Issue (6): 834-842.doi: 10.11872/j.issn.1005-2518.2021.06.104

• 采选技术与矿山管理 • 上一篇    下一篇

不同热冲击过程花岗岩I型和Ⅱ型断裂特性研究

范晓冬1(),李响1,2(),陶明1,尹土兵1,李夕兵1   

  1. 1.中南大学资源与安全工程学院,湖南 长沙 410083
    2.中山大学土木工程学院,广东 珠海 519082
  • 收稿日期:2021-07-28 修回日期:2021-10-03 出版日期:2021-12-31 发布日期:2022-03-07
  • 通讯作者: 李响 E-mail:Xiaodong_Fan2021@163.com;lixiang85@mail.sysu.edu.cn
  • 作者简介:范晓冬(1995-),男,河南郑州人,硕士研究生,从事岩石力学研究工作。Xiaodong_Fan2021@163.com
  • 基金资助:
    国家自然科学基金项目“深部高温高应力岩石动态断裂特征及微观破裂机理”(51774325);珠海市社会发展领域科技计划项目“复合地层复杂环境下大断面顶管隧道安全施工及灾害防控技术研究与应用”(ZH22036205200004PWC);中山大学中央高校基本科研业务费专项(2021qntd15)

Study on Mode and Mode 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

摘要:

在岩石工程中发生的与高温相关的灾害中,快速降温的影响(热冲击)不可忽视,因此,研究在不同程度的热冲击作用下花岗岩的断裂特性可以对遭受高温灾害后岩石工程的稳定性分析提供理论依据和技术支撑。在本研究中,花岗岩被加热至目标温度(200 ℃、400 ℃、600 ℃),利用制冷剂的不同温度(-20 ℃、20 ℃、60 ℃) 为高温试样提供不同速率的降温处理。热处理前后对试样干密度、孔隙率和纵波波速进行测定,并通过巴西劈裂试验测试试样Ⅰ型、Ⅱ型断裂韧度。试验结果表明:干密度、纵波波速以及Ⅰ型、Ⅱ型断裂韧度均随降温速率的增大而减小,孔隙率则随降温速率的增大而增大;快速冷却引发的拉应力是造成花岗岩损伤的主要原因,且与岩石试样和制冷剂之间的温差呈正相关。

关键词: 花岗岩, 热冲击, 制冷液, 降温速率, 断裂韧度, 温度梯度

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

中图分类号: 

  • TD853

图1

花岗岩试样Q-石英;Kfs-钾长石;Bt-黑云母"

图2

热处理过程示意图"

表1

不同程度热冲击后花岗岩物理力学性质"

试样温度/℃制冷液温度/℃干密度/(kg·m-3孔隙率/%纵波波速/(m·s-1Ⅰ型断裂韧度/(MPa·m0.5Ⅱ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

图3

断裂韧度测试"

图4

不同程度热冲击后花岗岩物理性质变化趋势"

图5

不同程度热冲击下花岗岩断裂韧度"

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