基于FLAC~(3D)数值模拟的让压锚索边坡加固机理研究

高地应力或软岩地区开挖边坡的卸荷变形量及范围均较大,普通锚杆(索)已不能满足此类变形的需要,探索新型支护措施已成为必然趋势。提出一种能够体现让压锚索工作原理的本构模型,结合FLAC~(3D)软件和FORTRAN编程语言成功实现了让压锚索边坡加固的数值模拟方法。以锦屏一级左岸边坡加固设计为例,对边坡开挖卸荷过程中不同锚索的边坡加固效果和影响规律进行模拟分析。结果表明,较普通锚索加固效果,让压锚索在边坡大变形方面具有明显优势,且其数值模拟方法的实现也为让压锚索支护方案的设计及优化提供了科学依据。

Reinforcement mechanism of slopes with yielding anchor cables based on numerical simulation of FLAC3D

The unloading deformation and range of the excavation slope are larger in high-ground stress or soft rock areas, and the ordinary bolt (cable) cannot meet the need of such deformation. So, exploring the new support measures has become an inevitable trend. A constitutive model to simulate the working principles of yielding anchor is put forward, and the numerical simulation method for the reinforcement of the yielding anchors are successfully realized. Taking the reinforcement design of the slope at the left bank of Jingping I Hydropower Station as a typical example, the effectiveness and influence of slope reinforcement in the excavation and unloading process are simulated and analyzed. The results show that the yielding anchor has certain advantages in the large deformation of the slope, and the numerical simulation method may provide a scientific basis for the design of the yielding anchor supporting scheme.