论文部分内容阅读
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。
The study of stress relaxation characteristics of soft rock is an important aspect of its long-term mechanical properties and the key to ensure the long-term safety and stability of soft rock tunnels with high ground stress. The TLW-2000 triaxial rheometer was used to test the stress relaxation of the argillaceous red sandstone of Yi-Ba (Yichang-Badong) highway with a confining pressure of 30 MPa. The experimental results show that in the relaxation process, with the development of relaxation damage, the relaxation has obvious nonlinear characteristics. The evolution law of damage dissipation energy in relaxation process was established, and the evolution equation of relaxation damage was established. The damage factor was introduced into the Nishihara model to establish a nonlinear relaxation damage model. By comparing with the experimental results, the model was established Reasonable, it may be appropriate - Pakistan Highway high ground stress soft rock tunnel long-term stability analysis to provide a scientific basis.