冻融后不同含水率红砂岩三轴蠕变特性及损伤模型研究

doi:10.11779/CJGE202108011

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摘要针对寒区自然环境对岩体长期稳定性的影响,以川藏铁路沿线的红砂岩为研究对象,对不同含水率的岩样进行了冻融后核磁共振检测及三轴蠕变试验。试验结果表明,含水率的增加促进了冻融循环过程中红砂岩内各尺寸孔隙的发育扩展,且冻融后红砂岩中孔的发育程度最高;在长期荷载作用下,冻融后红砂岩的时效变形特征呈现明显的软化趋势,随着含水率的增加,冻融后红砂岩的蠕变量及蠕变速率随之增大,而荷载等级及长期强度显著降低,破坏断面由单一剪切向张拉劈裂型逐渐演变。根据试验结果,基于损伤力学原理建立一种考虑冻融及含水劣化的西原模型,并通过弹塑性力学理论将其扩展为三维形式,采用通用全局优化算法对模型进行参数辨识,借此揭示了模型参数及劣化系数随冻融循环次数及含水率的变化规律。通过FLAC^3D岩石三轴蠕变仿真模拟,验证模型能较好地反映冻融后不同含水率红砂岩全阶段蠕变特征。研究结果可为川藏线寒区岩土工程长期稳定性提供科学依据及技术参考。

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	万亿
	陈国庆
	孙祥
	张广泽

关键词 ：红砂岩, 三轴蠕变, 损伤力学, 本构模型

Abstract：In view of the influences of the natural environment in cold regions on the long-term stability of rock mass, the red sandstone samples along Sichuan-Tibet railway are taken as the research object, and the nuclear magnetic resonance and triaxial creep experiments are conducted on the samples subjected to freeze-thaw cycles under different water contents. The experimental results show that the increase of water content promotes the development and expansion of pores in red sandstone during freeze-thaw cycles, and the development degree of mesopore in red sandstone after freeze-thaw cycles is the highest. The time-dependent deformation characteristics of red sandstone after freeze-thaw cycles present obvious softening trend, and the creep strain and rate of red sandstone subjected to freeze-thaw cycles increase with the increase of water content, while the load capacity and the long-term strength decrease significantly, and the fracture surface evolves from single shear to tension splitting gradually. According to the experimental results, a modified Nishihara model considering freeze-thaw damage and water deterioration is proposed based on the principle of damage mechanics, which is further extended to a three-dimensional creep constitutive equation based on the elastoplastic mechanics. The parameters of the model are identified by using the universal global algorithm with the creep data, and the variation trend of the parameters and deterioration coefficients with the number of freeze-thaw cycles and water content is revealed. Finally, the model is written into FLAC^3D to realize the numerical simulation of triaxial creep experiments of rock, and it is verified that the model can well reflect the creep characteristics at all creep stages of red sandstone subjected to freeze-thaw cycles under different water contents. The research results can provide scientific basis and technical reference for the long-term stability of geotechnical engineering in cold regions along Sichuan-Tibet highway.

Key words： red sandstone triaxial creep damage mechanics constitutive model

收稿日期: 2020-12-25

ZTFLH:

TU452

基金资助:国家自然科学基金项目（41972284,41521002）; 中铁二院工程集团有限责任公司科研项目（KYY2020010（20-21））

通讯作者: *（E-mail: chgq1982@126.com）

作者简介: 万亿(1994— ),男,硕士研究生,主要从事岩石力学方面的研究工作。E-mail: 470536212@qq.com。

引用本文:

万亿, 陈国庆, 孙祥, 张广泽. 冻融后不同含水率红砂岩三轴蠕变特性及损伤模型研究[J]. 岩土工程学报, 2021, 43(8): 1463-1472. WAN Yi, CHEN Guo-qing, SUN Xiang, ZHANG Guang-ze. Triaxial creep characteristics and damage model for red sandstone subjected to freeze-thaw cycles under different water contents. Chinese J. Geot. Eng., 2021, 43(8): 1463-1472.

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http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/10.11779/CJGE202108011 或 http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/Y2021/V43/I8/1463

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