层间错动带剪切蠕变试验及蠕变模型研究

doi:10.13722/j.cnki.jrme.2020.0881

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摘要层间错动带是控制白鹤滩水电站工程区坝基及地下厂房洞室群围岩安全稳定性的一种典型软弱结构面，其力学时效性研究对工程围岩体的长期稳定性十分重要，从已有研究成果来看，白鹤滩层间错动带蠕变特性方面的研究成果较少。以白鹤滩工程区内的层间错动带原状试样为研究对象，进行剪切蠕变试验，探究层间错动带的蠕变特性、蠕变速率及长期强度等特征。试验结果表明：层间错动带原状试样具有典型的蠕变特性；采用等时曲线簇方法确定了不同法向力下层间错动带的长期强度。最后，基于元件法和屈服面蠕变模型，建立能够描述层间错动带瞬时弹性、稳定蠕变及加速蠕变特征的非定常黏弹塑性蠕变模型，拟合结果显示，该蠕变模型能够较好地反映错动带的蠕变特性。研究结果对于进一步揭示层间错动带的时效性规律和理论研究具有一定意义。

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	韩钢1
	2
	侯靖3
	周辉1
	2
	张传庆1
	2
	高阳1
	2
	杨柳1
	2
	陈平志3

关键词 ：岩石力学, 层间错动带, 剪切蠕变试验, 蠕变特性, 长期强度, 非定常黏弹塑性模型

Abstract：The interlayer shear weakness zone(ISWZ) is a typical weak structural plane which controls the safety and stability of the dam foundation and underground caverns in Baihetan Hydropower Station. It is very important for the long-term stability of engineering surrounding rock mass to study the time-dependent mechanical effects. However，from the existing research results，there is little research on the creep characteristics of ISWZs in Baihetan. In this paper，the creep characteristics of undisturbed ISWZs¢ specimens in the Baihetan engineering area are studied through direct shear creep tests. The experimental results show that the undisturbed specimens of ISWZs present typical creep characteristics. The long-term shear strength of the ISWZs under various normal stresses is determined by isochronous curve cluster method. Finally，based on the element method and the yield surface creep model，a non-stationary viscoelastic-plastic creep model which can describe the instantaneous elasticity，stable creep and accelerated creep characteristics of ISWZs is established. The fitting results show that this creep model can well reflect the creep characteristics of ISWZs. The research results can provide a reference for further revealing the time-dependent law of ISWZs.

Key words： rock mechanics interlayer shear weakness zones direct shear creep experiments creep characteristics long-term strength non-stationary viscoelastic-plastic constitutive model

引用本文:

韩钢1，2，侯靖3，周辉1，2，张传庆1，2，高阳1，2，杨柳1，2，陈平志3. 层间错动带剪切蠕变试验及蠕变模型研究[J]. 岩石力学与工程学报, 2021, 40(5): 958-971.
HAN Gang1，2，HOU Jing3，ZHOU Hui1，2，ZHANG Chuanqing1，2，GAO Yang1，2，YANG Liu1，2，CHEN Pingzhi3. Shear creep experimental study on constitutive model of interlayer shear weakness zones. , 2021, 40(5): 958-971.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2020.0881 或 http://rockmech.whrsm.ac.cn/CN/Y2021/V40/I5/958

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