膨胀土收缩开裂特性研究

唐朝生 施斌 刘春

唐朝生, 施斌, 刘春. 2012: 膨胀土收缩开裂特性研究. 工程地质学报, 20(5): 663-673.
引用本文: 唐朝生, 施斌, 刘春. 2012: 膨胀土收缩开裂特性研究. 工程地质学报, 20(5): 663-673.
TANG Chaosheng, SHI Bin, LIU Chun. 2012: STUDY ON DESICCATION CRACKING BEHAVIOUR OF EXPANSIVE SOIL. JOURNAL OF ENGINEERING GEOLOGY, 20(5): 663-673.
Citation: TANG Chaosheng, SHI Bin, LIU Chun. 2012: STUDY ON DESICCATION CRACKING BEHAVIOUR OF EXPANSIVE SOIL. JOURNAL OF ENGINEERING GEOLOGY, 20(5): 663-673.

膨胀土收缩开裂特性研究

基金项目: 

国家自然科学基金项目(41072211); 江苏省自然科学基金项目(BK2011339)和高等学校博士学科点专项科研基金(新教师基金课题)(20090091120037)

详细信息
    作者简介:

    唐朝生,主要从事环境岩土工程和工程地质方面的研究工作. Email: tangchaosheng@nju.edu.cn

  • 中图分类号: TU44

STUDY ON DESICCATION CRACKING BEHAVIOUR OF EXPANSIVE SOIL

  • 摘要: 在干燥环境中,由于蒸发失水,膨胀土发生收缩,表面容易产生纵横交错的裂隙网络(龟裂)。龟裂的产生会极大弱化土体的工程性质,并导致各种工程问题。随着极端干旱气候的频发,膨胀土龟裂问题将会越来越多,越来越显著。开展龟裂研究对揭示龟裂现象的本质规律和指导膨胀土地区的工程实践有重要意义。龟裂的形成和发展是一个动态的过程,与土中水分的蒸发速率、应力状态、收缩特性等直接相关:龟裂形成时水分蒸发处于常速率阶段; 吸力和抗拉强度是制约龟裂形成的两个关键力学参数,当土体中的吸力引起的张拉应力超过土体的抗拉强度时,龟裂便会产生; 龟裂是孔隙发生收缩的直观表现。总体上,力的作用和收缩空间是土体龟裂形成的两个必要条件。此外,膨胀土龟裂具有非常复杂的发生发展过程,受土质学、土力学、土结构、试验条件和方法等许多因素的影响。龟裂定量分析是龟裂研究的重要内容之一,能为龟裂机理研究及相关理论模型的建立提供必要参数。计算机图形处理技术具有效率高、操作性强、精度高等优点,为龟裂定量分析提供了强有力的工具。目前关于土体龟裂研究还存在许多不足之处,在今后的工作中,应该重视龟裂形成和发展过程的动态特征,围绕与土体龟裂相关的水-土作用关系、力学机制、收缩变形机制、大尺度现场试验和三维观测分析技术等方面开展更多的针对性研究,综合考虑龟裂形成过程中的土质学、土力学和土结构因素,结合宏观现象与微观分析,建立土体龟裂的理论体系。
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  • 收稿日期:  2012-05-20
  • 修回日期:  2012-05-27
  • 刊出日期:  2012-10-25

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