白垩系冻结砂岩解冻过程中蠕变力学特性研究

doi:10.13722/j.cnki.jrme.2021.0413

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摘要立井冻结壁施工完成后会经历长时间的解冻过程，在长期荷载作用下会产生蠕变变形，冻结岩石解冻过程中的蠕变行为是控制冻结壁长期稳定的关键问题。以甘肃新庄煤矿回风立井冻结工程为背景，分析白垩系冻结砂岩解冻过程中的蠕变力学特性，同时采用核磁共振技术检测解冻过程中孔隙水含量的变化，分析未冻水与砂岩强度的关系，并基于分数阶理论，建立非线性蠕变本构方程。结果表明：岩石中孔隙水主要包括自由水、毛细水和吸附水3种形式，在常温下主要以自由水形式存在，在低温下主要以吸附水状态存在；冻结砂岩解冻过程中长期强度随温度升高逐渐降低，约为常规三轴压缩强度的45%～51%，且在−4 ℃时有突变现象；冻结砂岩长期强度与未冻水含量关系密切，呈指数函数关系；冻结砂岩的蠕变破坏主要是应力场、化学势场和渗流场三场耦合的作用，其中应力场起主导作用；根据冻结砂岩解冻过程中的蠕变变形特性，引入分数阶函数，基于分数阶理论建立相应的非线性蠕变方程。研究成果可为评价冻结壁解冻诱发失稳破坏提供理论支撑和技术支持。

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	李祖勇1
	杨更社1
	魏尧2

关键词 ：岩石力学, 白垩系, 冻结砂岩, 解冻过程, 蠕变特性, 分数阶理论

Abstract：After construction，shaft freezing walls will experience a long thawing process，creep deformation will occur under long-term loads. The creep behavior of frozen rocks during the thawing process is the key issue to control the long-term stability of the frozen walls. Based on the freezing engineering of the return air shaft in Xinzhuang Coal Mine，Gansu，this paper analyzes the creep mechanical characteristics of the frozen Cretaceous sandstone during the thawing process. At the same time，nuclear magnetic resonance technology is used to test the change of the pore water content during the thawing process to analyze the relationship between the unfrozen water and the sandstone strength. Based on the fractional order theory，a nonlinear creep constitutive equation is established. The results show that the pore water in rocks mainly presents three forms such as free water，capillary water and adsorbed water，mainly exists in the forms of free water at room temperature and adsorbed water at low temperature. During the thawing process of frozen sandstone，the long-term strength，gradually decreasing with increasing temperature，is about 45%–51% of the conventional triaxial compressive strength，and changes suddenly at – 4 ℃. It is also found that the long-term strength of the frozen sandstone is closely related to the unfrozen water content，showing an exponential function. The creep failure of the frozen sandstone is mainly due to the coupling of stress field，chemical potential field and seepage field，and the stress field plays a leading role. According to the creep deformation characteristics of the frozen sandstone during the thawing process，and introducing a fractional order function，a corresponding nonlinear creep equation is established based on the fractional order theory. The research results can provide theoretical and technical support for evaluating the instability and damage of frozen walls induced by the thawing.

Key words： rock mechanics cretaceous frozen sandstone thawing process creep characteristics fractional-order theory

引用本文:

李祖勇1，杨更社1，魏尧2. 白垩系冻结砂岩解冻过程中蠕变力学特性研究[J]. 岩石力学与工程学报, 2021, 40(9): 1777-1788.
LI Zuyong1，YANG Gengshe1，WEI Yao2. Study on creep mechanical properties of frozen cretaceous sandstone during thawing process. , 2021, 40(9): 1777-1788.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0413 或 http://rockmech.whrsm.ac.cn/CN/Y2021/V40/I9/1777

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