| 宜-巴高速公路泥质红砂岩三轴应力松弛特性研究 |
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| 引用本文： | 田洪铭,陈卫忠,赵武胜,田田,袁克阔.宜-巴高速公路泥质红砂岩三轴应力松弛特性研究[J].岩土力学,2013,34(4):981-986. |
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| 作者姓名： | 田洪铭 陈卫忠 赵武胜 田田 袁克阔 |
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| 作者单位： | 中国科学院武汉岩土力学研究所 岩土力学与工程国家重点实验室，武汉 430071 |
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| 基金项目： | 国家杰出青年基金资助（No. 51225902）；国家青年科学基金资助（No.51009133）；国家青年科学基金资助（No. 51108448） |
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| 摘 要： | 软岩应力松弛特性研究是其长期力学特性研究的重要方面，亦是保证高地应力软岩隧道长期安全稳定的关键。采用TLW－2000三轴流变仪，对宜－巴（宜昌至巴东）高速公路泥质红砂岩进行围压为30 MPa的应力松弛试验研究。试验结果表明，在松弛过程中，随着松弛损伤的发展，导致松弛具有明显的非线性特征。对松弛过程中损伤耗散能变化规律的分析，建立松弛损伤的演化方程，并将损伤因子引入到西原模型中建立非线性的松弛损伤模型，通过与试验结果的对比分析，验证所建模型的合理性，可为宜－巴高速公路高地应力软岩隧道长期稳定性分析提供科学依据。
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| 关 键 词： | 软岩 应力松弛特性 损伤 西原模型 |
| 收稿时间： | 2012-02-21 |
Analysis of triaxial stress relaxation properties of red silty mudstone of Yichang-Badong highway |
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| TIAN Hong-ming,CHEN Wei-zhong,ZHAO Wu-sheng,TIAN Tian,YUAN Ke-kuo.Analysis of triaxial stress relaxation properties of red silty mudstone of Yichang-Badong highway[J].Rock and Soil Mechanics,2013,34(4):981-986. |
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| Authors: | TIAN Hong-ming CHEN Wei-zhong ZHAO Wu-sheng TIAN Tian YUAN Ke-kuo |
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| Institution: | State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechancis, Chinese Academy of Sciences, Wuhan 430071, China |
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| Abstract: | Study of stress relaxation properties of soft rock is an important aspect of long-term mechanical property, which is very important to keep soft rock tunnel long-term stability. The stress relaxation test of red silty mudstone under triaxial compression with confining pressure of 30 MPa is carried out on TLW-2000 triaxial rheological machine. The test results show that: with the deterioration of material properties and relaxation damage evolution, the process of stress relaxation is nonlinear. By analyzing the damage energy dissipation during stress relaxation, a new relaxation damage equation is established. And, a nonlinear relaxation model is established by introducing the damage factor into Nishihara model. The fitting results of stress relaxation test show that the stress relaxation properties are well reflect by this model. The research results provide a scientific basis for long-term stability analysis of soft rock tunnel for Yichang-Badong Expressway. |
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| Keywords: | soft rock stress relaxation property damage Nishihara model |
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