忠玉水电站拱肩槽高边坡稳定性分析  

Stability Analysis of Spandrel Groove High Slopes of Zhongyu Hydropower Station

作　　者：吕光潮 李树武[3] 李常虎 李征征[3] 符文熹[1,2] LYU Guangchao;LI Shuwu;LI Changhu;LI Zhengzheng;FU Wenxi(College of Water Resource and Hydropower Engineering,Sichuan University,Chengdu 610065,China;State Key Lab.of Hydraulics and Mountain River Engineering,Sichuan University,Chengdu 610065,China;PowerChina Northwest Engineering Corporation Limited,Xi'an 710065,China)

机构地区：[1]四川大学水利水电学院,成都610065 [2]四川大学水力学与山区河流保护国家重点实验室,成都610065 [3]中国电建集团西北勘测设计研究院有限公司,西安710065

出　　处：《西北水电》2024年第4期69-75,共7页Northwest Hydropower

基　　金：国家自然科学基金项目(42107172);四川省科技厅重点研发项目(2022YFN0023).

摘　　要：在风化、卸荷等因素的影响下,高陡边坡稳定性是水电工程重点关注的问题。为评价忠玉水电站拱肩槽高边坡稳定性,确保工程建设安全进行,根据现场调查坝址区工程地质条件,采用块体理论和数值模拟分析天然、暴雨和地震工况下拱肩槽边坡的稳定性。结果表明:天然工况下左岸破坏区深度小于10 m,右岸破坏区较少,整体较稳定;暴雨工况下破坏区深度最深达20 m,左岸高高程卸荷层存在少量拉张破坏区,左岸高高程浅表局部有失稳可能;地震工况下破坏区深度最深达30 m,两岸边坡稳定性欠佳,建议在施工期间注意开挖爆破导致的小型崩塌落石等,做好主动防护措施。Under the influence of weathering,unloading and other factors,the stability of high and steep slopes is a key concern of hydropower projects.In order to evaluate the stability of the spandrel groove high slope of Zhongyu Hydropower Station and ensure the safety of the project construction,the stability of spandrel groove slope under natural,rainstorm and earthquake conditions is analyzed by block theory analysis and numerical simulation based on the engineering geological conditions of the dam site identified through field investigation.The results show that under natural conditions,the depth of the damage zone on the left bank is less than 10 m,the damage zone on the right bank is less,and the overall stability is relatively stable.Under the condition of heavy rain,the depth of the failure zone is up to 20 m,and there is a small amount of tensile failure zone in the high-elevation unloading layer on the left bank,and there is a possibility of local instability in the high-elevation shallow surface of the left bank.Under the seismic condition,the depth of the failure zone is up to 30 m,and the stability of the slopes on both sides is poor.It is suggested that attention should be paid to small collapse and rockfall caused by excavation and blasting during construction,and active protective measures should be taken.

关 键 词：高边坡 块体理论 有限差分 稳定性 

分 类 号：U213.13[交通运输工程—道路与铁道工程]