裂隙砂岩未冻水含量演化特征研究

doi:10.13722/j.cnki.jrme.2022.0555

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摘要孔隙水的冻结是寒区岩体发生冻胀损伤的根源，研究未冻水含量演化规律对于了解孔隙水的冻结过程，揭示冻结岩体的损伤机制具有重要意义。以完整与双裂隙砂岩为研究对象，开展不同冻结温度(－2 ℃，－5 ℃，－10 ℃，－15 ℃，－20 ℃)下循环冻融试验，采用核磁共振系统检测未冻水含量变化。通过分析冻结温度、冻融次数、裂隙对未冻水的影响，探究未冻水含量与砂岩细观损伤的关联。结果表明：(1) 岩样未冻水含量随温度降低呈指数型衰减，在温度梯度作用下，毛细水的冻结速率最快，自由水次之，结合水的冻结速率最慢；(2) 未冻水含量与冻融循环次数线性负相关，当冻结温度低于－20 ℃时，冻融次数对未冻水含量的影响减弱，但裂隙的存在促使冻融前期自由水冻结速率加快，中、后期结合水加速冻结，相比完整岩样，裂隙岩样未冻水含量减少5%；(3) 岩石孔隙体积和渗透率均与冰含量呈正相关，裂隙岩石的冻融损伤主要是由于冻融前期自由水的原位冻结，后期结合水的继续冻结以及毛细水的迁移过程造成的。该研究有助于深入了解裂隙岩石的冻融特性，为寒区岩体工程安全建设与运营提供理论依据。

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	宋勇军
	张君
	陈佳星
	郭玺玺
	孟凡栋
	李晨婧

关键词 ：岩石力学, 椭圆裂隙砂岩, 冻融循环, 未冻水含量, 核磁共振, 细观特征

Abstract：The freezing of pore water is the root of frost heave damage of rock mass in cold regions. Studying the evolution law of unfrozen water content is of great significance to understand the freezing process of pore water and to reveal the damage mechanism of frozen rock mass. Taking intact and double fractured sandstone as the research object，the cyclic freeze-thaw tests were carried out at different freezing temperatures(－2 ℃，－5 ℃，－10 ℃，－15 ℃，－20 ℃)，and the changes of the unfrozen water content were detected by nuclear magnetic resonance(NMR) system. By analyzing the influence of freezing temperature，freeze-thaw times and cracks on unfrozen water，the relationship between the unfrozen water content and the sandstone meso damage is explored. The results show that：(1) The unfrozen water content of rock samples decreases exponentially with the decrease of the temperature. Under the action of the temperature gradient，the freezing rate of capillary water is the fastest，followed by free water，and the freezing rate of bound water is the slowest. (2) The unfrozen water content has a linear negative correlation with the number of freeze-thaw cycles. When the freezing temperature is lower than －20 ℃，the influence of the number of freeze-thaw on the unfrozen water content is weakened，but the existence of accelerates the freezing rate of free water in the early stage of freezing and thawing，and the freezing of combined water in the middle and late stages. Compared with the complete rock sample，the unfrozen water content of fractured rock sample is reduced by 5%. (3) The pore volume and permeability of rock are positively correlated with ice content. The freeze-thaw damage of fractured rock is mainly caused by the in-situ freezing of free water in the early stage of freeze-thaw，the continuous freezing of bound water in the later stage and the migration of capillary water. This study is helpful to understand the freeze-thaw characteristics of fractured rocks，and provides a theoretical basis for the safe construction and operation of rock mass engineering in cold regions.

Key words： rock mechanics elliptical fractured sandstone freeze-thaw cycle unfrozen water content nuclear magnetic resonance(NMR) meso characteristics

引用本文:

宋勇军，张君，陈佳星，郭玺玺，孟凡栋，李晨婧. 裂隙砂岩未冻水含量演化特征研究[J]. 岩石力学与工程学报, 2023, 42(3): 575-584.
SONG Yongjun，ZHANG Jun，CHEN Jiaxing，GUO Xixi，MENG Fandong，LI Chenjing. Study on evolution characteristics of unfrozen water content in fractured sandstone. , 2023, 42(3): 575-584.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0555 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/I3/575

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