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浙江大学学报(工学版)
J4  2010, Vol. 44 Issue (10): 1967-1973    DOI: 10.3785/j.issn.1008-973X.2010.10.021
    
Unloading effect and rapture zone distribution of columnar joints cavern
ZHU Dao-jian
Shanghai Municipal Engineering Design General Institute, Shanghai 200092, China
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Abstract  

he unloading effect was studied in order to analyze the critical deformation and the rupture zone of columnar joints cavern. The mechanism of elastic modulus changing with the stress level was studied based on the mixed multiweakness planes softening constitutive model. A formula that applied to columnar jointed rock mass was deduced, and the unloading effect was implemented in the constitutive model of columnar jointed rock mass. The excavation of columnar joints cavern was analyzed combined with the results, and the deformation characteristics and the distribution of plastic zone were obtained. Results show that the failure of joints was closely related to the tendency. Then the influence of each joints in the developing process of plastic zone was analyzed. The greatest impact was main joints that were perpendicular to excavation surface. The distribution of rupture zone of columnar jointed rock mass was revealed, which was the process of breakdown of main joints followed with the rupture of minor joints and the cracking of rock.

Published: 01 October 2010
CLC:  TU 411  
  TU 472.5  
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Cite this article:

SHU Dao-Jian. Unloading effect and rapture zone distribution of columnar joints cavern. J4, 2010, 44(10): 1967-1973.

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http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2010.10.021     OR     http://www.zjujournals.com/eng/Y2010/V44/I10/1967


柱状节理岩体开挖卸荷效应及破裂区分布规律

为了分析柱状节理洞室的变形和破裂区分布特征,研究岩体开挖扰动后的卸荷效应.在构建的复合型多弱面本构模型的基础上,建立柱状节理岩体开挖卸荷过程中弹性模量随应力水平的变化机制,提出适用于柱状节理岩体的理论公式,并成功嵌入本构模型,实现了柱状节理岩体的卸荷效应.结合取得的研究成果,进行柱状节理洞室开挖的计算分析,获取了围岩的变形特征及塑性区分布规律,发现节理面的屈服破坏与节理的倾向关系密切.研究各组节理面在塑性区开展过程中的影响,结果表明，垂直于开挖面的主节理面影响最大.揭示了柱状节理洞室围岩破裂区的开展过程及分布规律,即主节理面破裂贯通的过程并伴随次节理面的破裂扩展及岩体的开裂.

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