Stability Analysis of a 90 m Super-High Disturbed Open-Pit Slope in Nepal Under Strong Earthquakes and Continuous Rainfall
-
摘要: 大量震灾现场表明,地震只是引发高边坡失稳滑坡的诱因之一,有时边坡失稳是由一系列诱因共同作用造成的。以尼泊尔山区高速公路某露天扰动90 m超高边坡为例,利用Slide软件对不同工况下(天然、暴雨和地震)的边坡进行稳定性分析,主要研究了渗流场演化过程,孔隙水压力动态变化规律以及不同持续时间降雨入渗对边坡稳定性的影响。研究结果表明:1)地震和暴雨均不利于边坡稳定,其中“坡面水”工况模拟结果偏保守,易导致设计冗余;2)连续降雨使渗入的雨水向临坡面迁移,易形成地表径流,导致边坡稳定性呈线性下降趋势;3)采用系统锚杆结合排水措施后,边坡稳定性显著提升,验证了“固脚强腰、排水优先”的支护理念。最后结合现场情况,提出适用于尼泊尔山区高边坡的施工建议。Abstract: A large number of earthquake disaster sites have shown that earthquakes are only one of the causes of landslides on high slopes. Sometimes a landslide is caused by a combination of multiple factors. Taking a 90 m super-high disturbed open-pit slope on a mountain highway in Nepal as an example, this study used Slide software to analyze the stability of the slope under different working conditions (dry, rainfall, and earthquake). The main research focused on the evolution of the seepage field, the dynamic variation of pore water pressure, and the influence of rainfall infiltration of different durations on slope stability. The results showed that: 1) Both earthquakes and rainstorms were detrimental to slope stability, among which the simulation results under the “slope surface water” working condition were conservative, which could easily lead to design redundancy. 2) Continuous rainfall caused the infiltrated rainwater to migrate to the adjacent slope surface, which easily formed surface runoff, resulting in a linear downward trend in slope stability. 3) After the application of systematic anchors combined with drainage measures, the slope stability was significantly improved, verifying the support concept of “solid feet and strong waist, drainage first”. Based on on-site conditions, construction suggestions suitable for high slopes in Nepal’s mountainous areas were proposed.
-
[1] SALINAS-JASSO J A,RAMOS-ZUÑIGA L G,MONTALVO-ARRIETA J C. Regional landslide hazard assessment from seismically induced displacements in Monterrey Metropolitan area,Northeastern Mexico[J]. Bulletin of Engineering Geology and the Environment,2019,78(2):1127-1141. [2] SASAHARA K,SAKAI N. Development of shear deformation due to the increase of pore pressure in a sandy model slope during rainfall[J]. Engineering Geology,2014,170(4):43-51. [3] CHEN Y L,LIU G Y,LI N,et al. Stability evaluation of slope subjected to seismic effect combined with consequent rainfall[J]. Engineering Geology,2020,266:105461. [4] 潘钦锋. 强震作用下某高边坡的稳定加固分析[J]. 石家庄铁道大学学报(自然科学版),2012,25(3):78-82. [5] 谭银龙,许万忠. 降雨入渗对裂隙岩质边坡稳定性影响分析[J]. 地质灾害与环境保护,2022,33(2):78-85. [6] 付建新,谭玉叶,宋卫东. 考虑二维降雨入渗的非饱和土边坡稳定性分析[J]. 东北大学学报,2014,35(11):1646-1649. [7] 叶帅华,唐宁,李京榜. 降雨入渗条件下框架锚杆支护边坡稳定性与变形分析[J]. 地基处理,2024,6(1):77-89. [8] 李晨嘉,孙立娟,赵一韩,等. 基于 GeoStudio 的降雨入渗边坡稳定性分析的数值模拟研究[J]. 吉林建筑大学学报,2024,41(5):44-52. [9] HOEK E. Hoek-Brown failure criterion-2002 edition[C]// Proceedings of the Fifth North American Rock Mechanics Symposium and the 17th Tunnelling Association of Canada Conference. Toronto:2002:267-273. [10] 李忠,朱彦鹏. 框架预应力锚杆边坡支护结构稳定性计算方法及其应用[J]. 岩石力学与工程学报,2005(21):124-128. [11] 唐湖北,蒋华春,黄伟. 锚杆支护方式对边坡稳定性的影响研究[J]. 公路工程,2012,37(1):61-64. [12] 朱彦鹏,侯喜楠,马响响,等. 框架预应力锚杆支护边坡稳定性极限分析[J]. 岩土工程学报,2021,43(增刊1):7-12. [13] 赖彦冰. 浅谈复杂地质下的高边坡稳定方案与滑坡治理方法[J]. 工程建设,2022,5(8):130-132. -
点击查看大图
计量
- 文章访问数: 22
- HTML全文浏览量: 8
- PDF下载量: 1
- 被引次数: 0
登录
注册
E-alert
登录
注册
E-alert
下载: