岩质高边坡稳定性分析及防治措施研究——以洋溪水利枢纽船闸下引航道高边坡为例

Stability analysis of rock high slope and study on prevention and control measures

岩质边坡稳定性是水利枢纽区最突出的岩土工程问题之一,岩质边坡稳定性评估对水利枢纽区具有重要意义。基于优势结构面统计分析进一步得出控制型结构面是复杂结构岩质边坡稳定性评估的有效手段。以洋溪水利枢纽工程船闸下引航道高边坡为例,经赤平投影技术及极限平衡法综合评估,得出了边坡控制型结构面,并采取了支护措施。该边坡在控制型结构面作用下,潜在失稳模式为楔形体模式;综合考虑暴雨工况和汛期工况后得出暴雨工况对边坡稳定性影响最大;针对边坡提出的支护措施进行综合评估,验证了支护措施的有效性。

The stability of rock slope is one of the most prominent geotechnical problems in hydro project area,and the evaluation of rock slope stability is of great significance.The control structural plane is concluded based on sta⁃tistical analysis of the dominant structural plane,which is an effective method to evaluate the stability of rock slope with complex structure.Taking the high slope by the lower approach channel of the ship lock of Yangxi Hydraulic Complex as example,the control structural plane of the slope is obtained through the comprehensive evaluation by horizontal projection technology and limit equilibrium method,and corresponding supporting measures are put for⁃ward.Under the action of control structural plane,the potential instability mode of the slope is wedge mode.After a comprehensive consideration of the rainstorm condition and flood season condition,it is concluded that rainstorm condition has the greatest influence on slope stability.The support measures proposed for the slope are evaluated comprehensively,which confirms the effectiveness of the support measures.