典型千枚岩高边坡稳定性分析及支护设计优化

十天（十堰—天水）高速公路安康段K57+265~+325路堑边坡为一典型千枚岩高边坡。原4级支护结构失效而产生滑塌，后更改为9级支护设计。对边坡滑塌成因进行了分析，运用Geo Slope通用岩土体软件对原设计方案和更改的设计方案进行了稳定性验算，并以这两种支护设计方案为基础分别在边坡级数、坡比、平台宽度、抗滑桩的布设位置及锚杆（索）长度等方面进行了支护方案的优化设计，给出了更为合理的6级支护建议。

Stability Analysis and Supporting Design Optimization on Typical Phyllite High Slope

The cutting slope at Ankang Section K57+265~K57+325 of Shiyan-Tianshui Highway is a typical phyllite high slope and the supporting structure thereof is changed from the original level 4 to 9 due to the collapse caused by the failure of this structure.This paper analyzes the genesis of the collapse and uses the Geo-Slope common software for rock soil mass to check the stability in the original and revised design scheme.Based on these two schemes，the slope hierarchy，slope ratio，platform width，anti-sliding piles’ arrangement and anchor rod (cable) design in the supporting scheme are optimized，thus the more rational supporting level 6 is suggested.