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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。
Unloading deformation and the range of excavation slope in high ground stress or soft rock area are large, ordinary bolt (cable) can not meet the needs of such deformation, to explore new support measures has become an inevitable trend. A constitutive model that can make the working principle of the pressure anchor line be presented is proposed. The numerical simulation method for strengthening the slope of the pressure anchor line is successfully realized by combining FLAC 3D software and FORTRAN programming language. Taking the reinforcement design of the left bank of Jinping Class I as an example, the reinforcement effects and influence laws of different anchors on slope during the excavation of slope excavation are simulated. The results show that compared with ordinary anchor cable reinforcement effect, the pressure anchor cable has obvious advantages in large deformation of slope, and its numerical simulation method provides a scientific basis for the design and optimization of pressure anchor cable support scheme.