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应用FLAC3D数值模拟软件,采用强度折减法,求解常德—张家界高速公路某段含软弱夹层的岩质边坡安全系数,讨论了求解效率及失稳判据等。实际运用表明,结合两种失稳判据控制程序运算,即利用收敛性判据作为边坡失稳的判据,实现运算循环的自动化,参照塑性区贯通准则来衡量每次运算循环的步数,可使计算模拟更符合工程实际。结合“二分法”的强度折减法与极限平衡法相比,计算结果误差较小,偏于保守。此外,强度折减法与“二分法”的结合运用可明显提高计算速率,夹层1、2的安全系数求解时间分别为2046和5929s。相比FLAC3D内置强度折减法的计算时间,前者效率提高近6倍,且所求解的边坡安全系数可信度高。
Using FLAC3D numerical simulation software, the strength reduction method was used to solve the safety factor of rock slope with a weak interlayer in Changde-Zhangjiajie expressway. The efficiency and instability criterion were discussed. The practical application shows that combining the two kinds of instability criterion control program operation, that is, using the convergence criterion as the criterion of slope instability to realize the automation of the operation cycle, the steps of each operation cycle are measured by referring to the plastic zone penetration criterion , Make the simulation more in line with the actual project. Compared with the limit equilibrium method, the strength reduction method combined with the “dichotomy” method has less error and is conservative. In addition, the combination of strength reduction method and “dichotomy ” can obviously improve the calculation speed, and the safety factor of interlayer 1, 2 is 2046 and 5929s respectively. Compared with FLAC3D built-in strength reduction method of calculating time, the former efficiency increased nearly 6-fold, and the slope of the safety factor to be solved with high credibility.