Study on shear creep test and nonlinear model of granite structural plane under coupled freeze-thaw cycle and chemical corrosion

IF 2.8 3区工程技术 Q2 MECHANICS

International Journal of Non-Linear Mechanics Pub Date : 2025-01-03 DOI:10.1016/j.ijnonlinmec.2024.105012

Fengrui Zhang , Wei Yin , Kun Zhang , Haopeng Jiang

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引用次数: 0

Abstract

To investigate the combined effect of freeze-thaw cycles and chemical corrosion on the shear creep characteristics of rock structural planes in cold regions, taking the granite structural planes of Huibai Tunnel in Jilin Province as the research object, microscopic structural observation and shear creep test were carried out on the structural surfaces treated by acidic, neutral and alkaline solution immersion and freeze-thaw cycles, analyzed the damage characteristics and creep mechanism of structural planes. The results show that: (1) With the increase of freeze-thaw and chemical corrosion, the structural plane of the mineral particles significantly reduced, the structural plane shows phenomena such as dissolution and hydrolysis, and the surface is gradually smoothed. (2) Compared with the natural condition, the instantaneous deformation of the samples under 20, 40, and 60 freeze-thaw cycles in H₂SO₄ solution increased by 47.43%, 64.52%, and 128.57%, the creep deformation increased by 36.58%, 53.68%, and 107.31%, and the instantaneous shear modulus decreased by 25.34%, 40.31%, and 64.35%. The instantaneous deformation, creep deformation and creep rate of the structural plane gradually increase with the increase of freeze-thaw and chemical corrosion, while the instantaneous shear modulus and long-term shear strength show a decreasing trend. (3) Compared with the natural condition, the instantaneous deformation of the samples in H₂SO₄, NaOH and NaCl solutions increased by 128.57%, 68.29% and 85.36% respectively under 60 freeze-thaw cycles, the creep deformation increased by 107.31%, 62.52% and 76.88% respectively, and the instantaneous shear modulus decreased by 64.35%, 50.31% and 56.54% respectively. The acidic H₂SO₄ solution has the greatest impact on the damage and creep parameters of the structural planes, followed by NaOH solution, with NaCl solution causing the least damage. Furthermore, in the damage process of structural planes, the freeze-thaw cycle and chemical corrosion promote each other mutually, since the combined influence of two-factor on damage and creep characteristics are greater than the influence of single factor. Based on the experimental results, considering the influence of freeze-thaw and chemical corrosion on model parameters, a nonlinear viscous element was introduced to describe the accelerated creep characteristics, the shear creep damage model of structural plane was established, and the reasonableness of the model was verified through test data. Finally, the three-dimensional roughness JRC^3D of the structural plane was selected as the evaluation index, and the influence of the three-dimensional roughness JRC^3D on the shear creep mechanical properties of the structural plane was discussed. The research results have guiding significance for the long-term stability evaluation of rock mass engineering in cold regions.

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冻融循环与化学腐蚀耦合作用下花岗岩结构面剪切蠕变试验及非线性模型研究

为研究冻融循环和化学腐蚀对寒区岩石结构面剪切蠕变特性的联合影响，以吉林惠柏隧道花岗岩结构面为研究对象，对酸性、中性和碱性溶液浸泡和冻融循环处理的结构面进行了微观结构观察和剪切蠕变试验。分析了结构面的损伤特征和蠕变机理。结果表明：(1)随着冻融和化学腐蚀的增加，矿物颗粒的结构面明显减小，结构面出现溶解、水解等现象，表面逐渐光滑；(2)与自然条件相比，在H2SO4溶液中冻融循环次数为20、40、60次的试样瞬时变形增大了47.43%、64.52%、128.57%，蠕变变形增大了36.58%、53.68%、107.31%，瞬时剪切模量减小了25.34%、40.31%、64.35%。随着冻融和化学腐蚀的增加，结构面的瞬时变形、蠕变变形和蠕变速率逐渐增大，而瞬时剪切模量和长期抗剪强度呈减小趋势。(3)与自然条件相比，60次冻融循环下，试样在H2SO4、NaOH和NaCl溶液中的瞬时变形量分别增大了128.57%、68.29%和85.36%，蠕变变形量分别增大了107.31%、62.52%和76.88%，瞬时剪切模量分别减小了64.35%、50.31%和56.54%。酸性H2SO4溶液对结构面损伤和蠕变参数的影响最大，NaOH溶液次之，NaCl溶液对结构面的损伤最小。此外，在结构面损伤过程中，冻融循环与化学腐蚀相互促进，双因素对损伤和蠕变特性的综合影响大于单因素的影响。在试验结果的基础上，考虑冻融和化学腐蚀对模型参数的影响，引入非线性粘性单元来描述结构面的加速蠕变特性，建立了结构面的剪切蠕变损伤模型，并通过试验数据验证了模型的合理性。最后，选取结构面三维粗糙度JRC3D作为评价指标，讨论了三维粗糙度JRC3D对结构面剪切蠕变力学性能的影响。研究成果对寒区岩体工程的长期稳定性评价具有指导意义。

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来源期刊

International Journal of Non-Linear Mechanics 物理-力学

CiteScore

5.50

自引率

9.40%

发文量

192

审稿时长

67 days

期刊介绍： The International Journal of Non-Linear Mechanics provides a specific medium for dissemination of high-quality research results in the various areas of theoretical, applied, and experimental mechanics of solids, fluids, structures, and systems where the phenomena are inherently non-linear. The journal brings together original results in non-linear problems in elasticity, plasticity, dynamics, vibrations, wave-propagation, rheology, fluid-structure interaction systems, stability, biomechanics, micro- and nano-structures, materials, metamaterials, and in other diverse areas. Papers may be analytical, computational or experimental in nature. Treatments of non-linear differential equations wherein solutions and properties of solutions are emphasized but physical aspects are not adequately relevant, will not be considered for possible publication. Both deterministic and stochastic approaches are fostered. Contributions pertaining to both established and emerging fields are encouraged.