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中南大学学报(自然科学版)

Journal of Central South University

第48卷    第8期    总第276期    2017年8月

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文章编号:1672-7207(2017)08-2126-07
制备岩石试样的高温预损伤方法及应用
吕庆1,周春锋1,郑俊1,于洋2

(1. 浙江大学 建筑工程学院,浙江 杭州,310058; 2. 浙江大学 海洋学院,浙江 舟山,316021)

摘 要: 通过高温加热预损伤试验,分析花岗岩密度、纵波波速、单轴抗压强度、劈裂抗拉强度、弹性模量随温度的变化规律,提出岩石加热损伤效应评价方法,并将高温损伤后的岩样应用到滚石碰撞试验中,以检验该方法的可行性。研究结果表明:随着加热温度升高,花岗岩的抗压强度、抗拉强度、弹性模量、纵波波速逐渐降低,当温度低于400 ℃时,变化幅度较小;在400~600 ℃时,试样的强度和弹性模量降低程度加剧;在800 ℃以上时,试样损伤严重,抗压强度、抗拉强度、弹性模量仅为常温下的10%~35%。因此,采用控制温度加热方法,可获得不同质量和不同物理力学性质的预损伤岩石试样。加热温度越高,滚石碰撞越破碎,高温损伤效应越显著。

 

关键字: 岩石试验;高温损伤;岩石强度;弹性模量;纵波波速

Preparing rock samples using high temperature heating damage method and its application
Lü Qing1, ZHOU Chunfeng1, ZHENG Jun1, YU Yang2

1. College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China; 2. Ocean College, Zhejiang University, Zhoushan 316021, China

Abstract:The relationship between the density, the P-wave velocity, the uniaxial compressive strength, the Brazilian tensile strength and the elastic modulus of granite with temperature were investigated by means of high temperature heating pre-damage experiment. A method for evaluating the damage effect of rock heating was proposed. Finally, the method was applied to preparing samples in rockfall impact testing to illustrate its feasibility. The results show that the properties including the compressive and tensile strength, the elastic modulus and P-wave velocity of the granite gradually decrease as the heating temperature increases. The change is small when the temperature is below 400 ℃. The rock properties of strength and modulus turn to deteriorate when the temperature increases from 400 ℃ to 600 ℃. And the damage becomes severe when the temperature is higher than 800 ℃, beyond which the properties such as the strength and the modulus decrease to 10%-35% of their original values. Thus, rock samples with different properties can be readily obtained by controlling the heating temperature. The higher the heating temperature, the severer the rockfall fragmentation, which illustrates, that the high temperature damage effect is obvious.

 

Key words: rock experiment; high temperature damage; rock strength; elastic modulus; P-wave velocity

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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