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金属矿山 ›› 2018, Vol. 47 ›› Issue (12): 45-50.

• 采矿工程 • 上一篇    下一篇

冻融循环对饱水岩石纵波波速影响的试验研究

崔贺佳1,2,夏冬1,2,吴朝松1,2,吴杨1,2   

  1. 1. 华北理工大学矿业工程学院,河北 唐山 063210;2. 河北省矿业开发与安全技术重点实验室,河北 唐山 063210)
  • 出版日期:2018-12-15 发布日期:2019-01-17
  • 基金资助:

    基金项目:河北省大学生创新训练项目(编号:省级X2016074),河北省自然科学基金项目(编号:E2018209281)。

Experimental Study on the Influence of Freeze-thaw Cycles on Longitudinal Wave Velocity of Saturated Rock

Cui Hejia1,2,Xia Dong1,2,Wu Zhaosong1,2,Wu Yang1,2   

  1. 1. College of Mining Engineering,North China University of Science & Technology,Tangshan 063210,China;2. Hebei Province Mining Industry Development with Safe Technology Priority Laboratory,Tangshan 063210, China
  • Online:2018-12-15 Published:2019-01-17

摘要: 为探究冻融作用对饱水岩石纵波波速与损伤变量的影响规律,在冻结温度为-20 ℃、融解温度为20 ℃的条件下,对饱水砂岩、黑云变粒岩、闪长岩和灰岩开展了40次的冻融循环试验。结果表明:在相同的冻融条件下,岩石的矿物成分、胶结类型、孔隙特征、矿物颗粒的排列方式对岩石的纵波波速和损伤变量均产生重要影响;经历40次冻融后,砂岩、黑云变粒岩、闪长岩和灰岩的纵波波速较饱水岩样分别降低了42.12%、14.30%、23.21%和19.24%;纵波波速和损伤变量降低幅度在前5个冻融周期降低较为明显,随冻融次数的增加,纵波波速与损伤变量的降低幅度逐渐减小并趋于稳定。

关键词: 冻融循环, 纵波波速, 闪长岩, 灰岩, 砂岩, 黑云变粒岩

Abstract: In order to investigate the effect of freeze- thaw cycles on the longitudinal wave velocity and the damage variable of saturated rock,40 freeze-thaw cycles were carried out on saturated sandstone, black cloud granulite, diorite and limestone under the condition of freezing temperature at -20 oC and melting temperature at 20 oC. The results show that the mineral composition, cementation type, pore characteristics, and the arrangement of mineral particles have a significant influence on the longitudinal wave velocity and damage variable of the rock under the same freeze-thaw conditions; after 40 freeze-thaw cycles, the longitudinal wave velocity of sandstone, black cloud granulite, diorite and limestone were decreased by 42.12%, 14.30%, 23.21% and 19.24% respectively compared with that of saturated rock samples; the reduction of longitudinal wave velocity and damage variable is more obvious in the first 5 freeze-thaw cycles. With the increase of freezing thawing times, the decreasing amplitude of the longitudinal wave velocity and the damage variable gradually decreases and tends to be stable.

Key words: Freeze- thaw cycle, Longitudinal wave velocity, Diorite, Limestone, Sandstone, Black cloud granulite