冻融环境下红砂岩三轴蠕变特性及其模型研究

doi:10.11779/CJGE202105007

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摘要为研究寒区岩体工程在冻融循环与长期荷载耦合作用下的时效力学特性,对不同冻融循条件下的饱和红砂岩进行分级加卸载三轴蠕变试验,研究冻融循环对岩石蠕变特性的影响。结果表明：冻融循环对红砂岩蠕变变形的影响与加载应力水平有关。低应力水平下,岩石黏弹性应变随冻融次数的增加近似线性缓慢增长;而高应力水平时则呈非线性增长;黏塑性应变随冻融次数的增加均呈近似线性增长,第四级加载应力水平（70% $\sigma_{c}$）为红砂岩蠕变变形特征的分界点。红砂岩稳态蠕变速率随冻融循环次数的增加呈指数型增长。根据红砂岩蠕变试验结果,建立考虑冻融循环作用影响及蠕变损伤的冻融-损伤蠕变模型,得到三维应力状态下岩石蠕变本构方程;对模型进行验证及参数识别,理论值与试验值吻合较好;分析了冻融循环作用对模型参数的影响。研究结果为寒区岩体工程的建设及长期稳定性分析提供理论依据。

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	宋勇军
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	陈佳星
	车永新
	杨慧敏
	毕冉

关键词 ：红砂岩, 冻融循环, 分级加卸载蠕变试验, 蠕变特性, 蠕变模型

Abstract：：In order to study the time-effectiveness mechanical properties of rock mass engineering in cold regions under the coupling of freeze-thaw cycles and long-term loads, the triaxial multi-level loading and unloading creep tests are carried out on saturated red sandstone under different freeze-thaw cycles. The results show that the effects of freeze-thaw cycles on the creep deformation of red sandstone are related to the loading stress level. At low stress levels, the viscoelastic strain of rock increases approximately linearly and slowly with the increasing freeze-thaw cycles, and at high stress levels, it increases nonlinearly. The viscoplastic strain increases linearly with increasing freeze-thaw cycles. The fourth-level loading stress level (70%$\sigma_{c}$) is the boundary point of the creep deformation characteristics of red sandstone. The steady-state creep rate of red sandstone increases exponentially with the increase of the freeze-thaw cycles. Based on the creep test results of the red sandstone, the freeze-thaw-damage creep model considering the effects of freeze-thaw cycles and creep damage is established. The creep equation for rock under three-dimensional stress is obtained. The proposed model is verified and its parameters are identified. The theoretical and experimental data are in good agreement. The influences of freeze-thaw cycles on the model parameters are analyzed. The research results may provide a theoretical basis for the construction of rock mass engineering and long-term stability analysis in cold regions.

Key words： red sandstone freeze-thaw cycle multi-level loading and unloading creep test creep property creep model

收稿日期: 2020-08-10

ZTFLH:

TU452

基金资助:国家自然科学基金项目（11972283,11872299）; 陕西省自然科学基金项目（2017JM1039）

通讯作者: *（E-mail：zhanglt95@163.com）

作者简介: 宋勇军(1979— ),男,副教授,博士生导师,主要从事岩石力学与地下工程方面的教学与研究工作。E-mail：songyj79@xust.edu.cn。

引用本文:

宋勇军, 张磊涛, 任建喜, 陈佳星, 车永新, 杨慧敏, 毕冉. 冻融环境下红砂岩三轴蠕变特性及其模型研究[J]. 岩土工程学报, 2021, 43(5): 841-849. SONG Yong-jun, ZHANG Lei-tao, REN Jian-xi, CHEN Jia-xing, CHE Yong-xin, YANG Hui-min, BI Ran. Triaxial creep properties and model of red sandstone under freeze-thaw environment. Chinese J. Geot. Eng., 2021, 43(5): 841-849.

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http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/10.11779/CJGE202105007 或 http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/Y2021/V43/I5/841

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