›› 2016, Vol. 37 ›› Issue (6): 1530-1541.doi: 10.16285/j.rsm.2016.06.002

• 基础理论与实验研究 • 上一篇    下一篇

裂隙冻胀压力及对岩体造成的劣化机制初步研究

刘泉声1, 2,黄诗冰1,康永水1,刘建平1   

  1. 1. 中国科学院武汉岩土力学研究所 岩土力学与工程国家重点试验室,湖北 武汉 430071; 2. 武汉大学 土木建筑工程学院 岩土与结构工程安全湖北省重点实验室,湖北 武汉 430072
  • 收稿日期:2014-11-07 出版日期:2016-06-13 发布日期:2018-06-09
  • 通讯作者: 黄诗冰,男,1989年生,博士研究生,主要从事裂隙岩体低温多场耦合与冻融损伤机制方面的研究。E-mail: huang1989.9@163.com E-mail:liuqs@whrsm.ac.cn
  • 作者简介:刘泉声,男,1962年生,博士,研究员,博士生导师,主要从事岩土工程方面的教学与研究工作。
  • 基金资助:

    国家自然科学基金重点项目(No.41130742);国家自然科学基金青年基金项目(No.41302237)。

Preliminary study of frost heave pressure and its influence on crack and deterioration mechanisms of rock mass

LIU Quan-sheng1, 2, HUANG Shi-bing1, KANG Yong-shui1, LIU Jian-ping1   

  1. 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China; 2. Hubei Provincial Key Laboratory of Geotechnical and Structural Engineering Safety, School of Civil and Architectural Engineering, Wuhan University, Wuhan, Hubei 430072, China
  • Received:2014-11-07 Online:2016-06-13 Published:2018-06-09
  • Supported by:

    This work was supported by the Key Program of National Natural Science Foundation of China (41130742) and the Young Scholars of National Natural Science Foundation of China (41302237).

摘要: 岩体在冻融循环下裂隙中会经历冻胀力的萌生、发展与消散,裂隙冻胀扩展和岩体冻胀损伤程度受冻胀力控制,基于热力学、渗流理论、界面力学和弹性理论建立了柱形封闭裂隙中冻胀力演化模型,对考虑水分迁移和不迁移两种情况下的冻胀力量值进行了研究。结果表明:不考虑水分迁移作用下冻胀力随裂隙饱和度 和岩石弹性模量 增加而迅速增大, 当 且 94%时产生的冻胀力超过15 MPa,足以驱动任何岩体冻胀开裂,不同岩石裂隙冻胀开裂存在一个对应的临界饱和度 ;考虑岩石的透水性,渗透率低于5×10?14 cm2的低渗透性岩石中裂隙水冻结会产生较大的冻胀水压力,容易引起裂隙冻胀扩展;而在渗透率大于10?12 cm2的高渗透性岩石中,饱和裂隙水冻结难以形成有害的冻胀水压,裂隙冻胀开裂主要是冻结后期在冰-岩界面间的微观未冻水膜中产生的分离压力引起。

关键词: 裂隙岩体, 冻胀力, 水分迁移, 分离压力, 劣化机制

Abstract: It is known that frost heave pressure goes through the process of initiation, development and dissipation when rock cracks under freeze-thaw cycles. Moreover, both the frost extension of cracking and the degree of frost damage of rock depend on frost heave pressure. Therefore, an analytical model is established for frost heave pressure in an idealized cylindrical closed crack, based on the theory of thermodynamics, seepage mechanics, interfacial mechanics and elastic theory. Besides, the effect of moisture migration on the value of frost heave pressure is investigated. Without considering the moisture migration, the results show that the frost heave pressure increases rapidly with the increase of water saturation in crack and rock elastic modulus Es. Under the condition of and 94%, the frost heave pressure exceeds 15 MPa, which is high enough to drive rocks to initiate cracking. In addition, the rock starts to crack once the water saturation reaches its own critical value, . For rocks with the low permeability below 5×10?14 cm2, a high frost heave pressure can be produced by frozen water in the crack, which easily leads to frost crack propagation. However, for rocks with the permeability above 10?12 cm2, the frost heave water pressure could not cause any damage. The main reason for crack frost propagation in high permeability rock is the disjoining pressure in a microscopic unfrozen water film between ice and rock interface after water frozen.

Key words: fractured rock mass, frost heave pressure, water migration, disjoining pressure, deterioration mechanism

中图分类号: 

  • TU 456

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