应力–冻融耦合作用下砂岩变形与损伤特征研究

doi:10.13722/j.cnki.jrme.2022.0217

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摘要寒冷地区工程岩体承受应力和冻融循环的共同作用。在长期应力–冻融耦合作用下，岩石力学性能会产生显著弱化，造成工程岩体灾害。为了研究应力–冻融耦合作用下砂岩的变形和宏细观损伤特征，首先采用砂岩试样开展冻融循环试验，研究无应力作用下砂岩冻融循环过程中的冻融变形规律。然后提出一种基于颗粒流和颗粒膨胀的岩石冻融循环数值模拟方法，并采用该方法开展应力作用下岩石冻融循环数值模拟，研究轴向应力作用下岩石冻融过程中的变形和破裂演化规律。研究结果表明：无轴向应力时，随着冻融循环次数的增大，砂岩的轴向和径向应变先增大后基本保持不变；冻融循环过程中砂岩试样轴向和径向应变存在显著差异，试样径向应变大于轴向应变，砂岩试样轴向和径向应变的差异随着冻融循环次数的增多先增大后减小；轴向应力不为0时，试样轴向应变随冻融循环次数的增大逐渐减小，径向应变随冻融循环次数的增大逐渐增大；在冻胀力作用下，试样表面附近的裂纹密度大于试样内部的裂纹密度；冻融循环过程中，轴向应力会抑制裂纹沿与试样轴线夹角较大的方向起裂和扩展；冻融循环过程中，试样内的破坏以拉伸破坏为主；基于颗粒流和颗粒膨胀的数值模拟方法能够较好的模拟冻融循环过程中砂岩的冻融变形和破裂演化规律。

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	朱谭谭1
	李昂1
	黄达2
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	宗西垒1
	马福旺1

关键词 ：岩石力学, 应力–冻融耦合, 轴向应力, 冻胀变形, 颗粒流, 冻胀损伤

Abstract：Engineering rock mass in cold regions is subjected to the combined effect of stress and freeze-thaw cycle. Under the long-term coupling action of stress and freeze-thaw，the mechanical properties of rock will be significantly weakened，which may result in engineering rock mass disasters. To investigate the deformation and damage characteristics in macro and micro view of sandstone under stress and freeze-thaw coupling，the freeze-thaw cycle test was carried out firstly on sandstone samples. The change in frost heaving deformation of sandstone during freeze-thaw cycle without stress was studied. Then，a numerical method for rock freeze-thaw cycle simulation based on particle flow and particle expansion was proposed. The method was used to carry out numerical simulations of rock freeze-thaw cycle under axial stress. The evolution of deformation and fracture in the process of freeze-thaw under axial stress is studied. Results show that without the action of axial stress，the axial and radial strains of sandstone first increase and then remain unchanged as the number of freeze-thaw cycles increases. There is a significant difference between axial strain and radial strain of sandstone samples during freeze-thaw cycle. The radial strain of sandstone samples is greater than the axial strain. The difference between axial strain and radial strain of sandstone samples first increases and then decreases with the increase of the number of freeze-thaw cycles. When the axial stress is greater than zero，the axial strain decreases with the increase of the number of freeze-thaw cycles，and the radial strain increases with the increase of the number of freeze-thaw cycles. Under the action of frost heaving force，the crack density near the sample surface is greater than that inside the sample. During the freeze-thaw cycle，the axial stress will inhibit the crack initiation and propagation along the direction with a large angle with the specimen axis. During the freeze-thaw cycle，the cracks formed inside the sample are mainly tensile crack. The numerical simulation method based on particle flow and particle expansion can better simulate the freeze-thaw deformation and fracture evolution of sandstone in the process of freeze-thaw cycle.

Key words： rock mechanics stress and freeze-thaw coupling axial stress frost heaving deformation particle flow frost heaving damage

引用本文:

朱谭谭1，李昂1，黄达2，3，宗西垒1，马福旺1. 应力–冻融耦合作用下砂岩变形与损伤特征研究[J]. 岩石力学与工程学报, 2023, 42(2): 342-351.
ZHU Tantan1，LI Ang1，HUANG Da2，3，ZONG Xilei1，MA Fuwang1. Deformation and damage characteristics of sandstone under the combined action of stress and freeze-thaw cycles. , 2023, 42(2): 342-351.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0217 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/I2/342

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