【摘要】 实际工程岩体在三向不等压主应力作用下渗流-应力耦合特性是目前学术界和工程界尚不明确的一个关键点.首先通过合理的理论分析与公式推导,给出了可描述三向主应力作用下无充填节理内渗流-应力耦合特性的理论公式;利用室内岩石真三轴渗流-应力耦合试验,验证了上述理论公式的可行性;通过基于全局优化算法的非线性拟合软件,结合试验数据给出了可信度较高的渗流-应力耦合特性经验公式;采用三维块体离散元方法开展数值试验,探讨了节理法向刚度参数取值方法的差异性,在合理赋值情况下验证了渗流-应力耦合特性经验公式的合理性;基于室内真三轴应力-渗流耦合试验、非线性数据拟合与离散元数值试验的系统研究结果证明了理论分析的准确性.更多还原

【Abstract】 The see page-stress coupling characteristic of practical engineering rock mass under 3 D unequal principal stress is a key point in the academic and engineering fields. A reasonable formula for stress-seepage cou-pling characteristics of rock mass with a single rough joint is deduced based on the theoretical analysis. The feasibil-ity of the theoretical expression is verified by the indoor true tri-axial stress-seepage coupling tests. Based on the test data,a reliable empirical formula is given by the powerful data fitting software. The numerical experiment is carried out by the 3 D distinct element method. The difference of the methods on choosing joint normal stiffness pa-rameter is discussed. The empirical formula is also verified by the numerical simulation based on reasonable as-signed parameter values. The theoretical analysis is fully tested by the indoor true tri-axial stress-seepage coupling tests,the credible non-linear fitting and the numerical simulation.更多还原