The reactivation of paleo-landslides on large reservoir bank slopes has been observed to cause sudden overall instability during progressive deformation processes, resulting in large-scale landslide-barrier lake disaster chains. This phenomenon has been recognized as a critical and challenging issue in disaster prevention and mitigation in reservoir areas of China. In response to this issue, a typical large reservoir bank slope in the Baihetan Reservoir area was selected as a case study, and a novel dynamic stability evaluation model for landslides was established. In this model, stress field variations induced by progressive deformation, such as settlement and inclination changes, were taken into account. Compared with traditional models, the proposed model was found to better reflect the actual stability conditions of the landslide in the field. According to monitoring data, failure occurred between September 1 and October 1, 2021, and stabilization was reached around October 31. During this period, the calculated safety factor exhibited an evolutionary trend of “basically stable” (1.114) → “marginally unstable” (1.041) → “basically stable” (1.122). The reduction in stability was attributed primarily to the combined effects of settlement and inclination changes, among which settlement deformation was identified as the dominant influencing factor. Therefore, in the stability analysis of reservoir bank slopes, it is suggested that, in addition to reservoir water level fluctuations, stress field variations induced by multi-source progressive deformation, such as vertical displacement and inclination—should also be considered. This result has provided a new mechanical modeling basis for early warning and risk assessment systems for large reservoir bank slopes. It is proposed that, in future engineering applications, multi-source monitoring equipment should be deployed at key locations, and the improved evaluation model should be used to monitor real-time variations in displacement and inclination. Such an approach is expected to offer more accurate mechanical criteria for slope hazard assessment in large reservoir projects such as Baihetan, thus facilitating advanced early warning and intelligent risk control.
DU Yan, LÜ Meng-jia, XIE Mo-wen, NING Li-ze, LIU Jing-nan, JIA Bei-ning.
Dynamic Stability Evaluation Method for Large Reservoir Bank Slopes and Its Engineering Application[J].
Science Technology and Engineering, 2026, 26(7): 2770-2779 DOI:10.12404/j.issn.1671-1815.2502576
YiX, FengW, LiB, et al. Deformation characteristics, mechanisms, and potential impulse wave assessment of the Wulipo Landslide in the Baihetan Reservoir Region, China[J]. Landslides, 2023, 20(3): 615-628.
[2]
ZhangW, LiuS, WangL, et al. The overall stability of a partially unstable reservoir bank slope to water fluctuation and rainfall based on Bayesian theory[J]. Landslides, 2024, 21(8): 2021-2032.
XuYuanmao, WuZhen, LiuJie. Early identification of potential landslide hazards and precipitation correlation analysis in Zhouqu County based on SBAS-InSAR technology[J]. Advanced Engineering Sciences, 2023, 55(6): 257-271.
[5]
ChengZ, LiuS, FanX, et al. Deformation behavior and triggering mechanism of the Tuandigou landslide around the reservoir area of Baihetan Hydropower Station[J]. Landslides, 2023, 20(8): 1679-1689.
JiangQiangqiang, JiaoYuyong, SongLiang, et al. Experimental study on reservoir landslide under rainfall and water-level fluctuation[J]. Rock and Soil Mechanics, 2019, 40(11): 4361-4370.
[8]
KamranM, HuX W, HussainM A, et al. Characterizing the fundamental controls on deformation and stability of an active reservoir landslide, Southwest China[J]. Polish Journal of Environmental Studies, 2022, 31(4): 3611-3626.
HeKeqiang, ChenWeigong, ZhangPeng. Real-time monitoring of dynamic stability coefficient and displacement criterion of the creep slope[J]. Chinese Journal of Rock Mechanics and Engineering, 2016, 35(7): 1377-1385.
ZengQingli, WangWeifeng, ChenHongyu, et al. Characteristics of Zhaojiagou colluviums landslide and its failure mechanism on slope structure, Zhenxiong County[J]. Journal of Engineering Geology, 2016, 24(4): 510-518.
[13]
DaiK, ChenC, ShiX, et al. Dynamic landslides susceptibility evaluation in Baihetan Dam Area during extensive impoundment by integrating geological model and InSAR observations[J]. International Journal of Applied Earth Observation and Geoinformation, 2023, 116: 103157.
ChenHe, TangHua, GeXiurun, et al. Research on early warning of creep landslide by early-warning indictors based on deep displacements[J]. Chinese Journal of Rock Mechanics and Engineering, 2019, 38(S1): 3015-3024.
DuYan, XieMowen, WuZhixiang, et al. Genetic mechanism about translational landslide and its safety evaluation[J]. Chinese Journal of Rock Mechanics and Engineering, 2019, 38(S1): 2871-2880.
XuQiang. Understanding the landslide monitoring and early warning: consideration to practical issues[J]. Journal of Engineering Geology, 2020, 28(2): 360-374.
[20]
WangS, WangJ E, WuW, et al. Creep properties of clastic soil in a reactivated slow-moving landslide in the Three Gorges Reservoir Region, China[J]. Engineering Geology, 2020, 267: 105493.
TangMinggao, LiSonglin, XuQiang, et al. Study of deformation characteristics of reservoir landslide based on centrifugal model test[J]. Rock and Soil Mechanics, 2020, 41(3): 755-764.
DuYan, LuYongdu, XieMowen, et al. Stability evaluation of creeping landslide considering variation of initial conditions[J]. Chinese Journal of Rock Mechanics and Engineering, 2020, 39(S1): 2828-2836.
[25]
KamranM, HuX W, HussainM A, et al. Dynamic response and deformation behavior of Kadui-2 Landslide influenced by reservoir impoundment and rainfall, Baoxing, China[J]. Journal of Earth Science, 2023, 34(3): 911-923.
[26]
DuY, XieM W, JiaJ L. Stepped subsidence: a possible mechanism for translational landslide[J]. Catena, 2020, 187: 104365.
DuYi, YanEchuan, CaiJingsen, et al. A mechanical model of progressive failure of linear complex landslides[J]. Chinese Journal of Rock Mechanics and Engineering, 2021, 40(3): 490-502.
DuYi, YanEchuan, CaiJingsen, et al. Mechanical discrimination of stability state of progressive failure of broken-line complex landslides[J]. Chinese Journal of Geotechnical Engineering, 2023, 45(6): 1151-1161.
SunLijuan, ShenFangming, ZhangHuzhu. Study on progressive instability mechanism of reservoir water resurrection laud-slide based on strength deterioration of sliding zone soil[J]. Journal of Jilin Jianzhu University, 2022, 39(4): 18-22, 28.
[33]
HuangY S, LiM L, GanF, et al. A new stability calculation method for displacement-resistance landslides based on the slice method considering progressive failure[J]. Energy Science & Engineering, 2025, 13(6): 2987-2999.
[34]
LuY, ZhaoH Z. Research on slope stability prediction based on MC-BKA-MLP mixed model[J]. Applied Sciences-Basel, 2025, 15(6): 3158.
[35]
SuA J, FengM Q, DongS, et al. Improved statically solvable slice method for slope stability analysis[J]. Journal of Earth Science, 2022, 33(5): 1190-1203.
LiuJing, ZuoShuangying. Fluid-solid coupling and instability mechanism analysis of bank slope under the combined effect of water level fluctuation and rainfall: taking the south bank landslide of Liudong in Pingtang County of Guizhou Province as an example[J]. Science Technology and Engineering, 2024, 24(12): 4876-4886.
[38]
工程地质手册编写委员会. 工程地质手册[M]. 北京: 中国建筑工业出版社, 2018.
[39]
Engineering Geology Manual Preparation Committee. Engineering geology handbook[M]. Beijing: China Architecture and Architecture Press, 2018.
LiLei, RuanBingqing, YangZhen, et al. Characteristics of self-healing of aniangzhai Landslide based on monitoring data[J]. Science Technology and Engineering, 2024, 24(18): 7785-7791.
WangHaiming, ZhuDianzhi, DingYutao, et al. Model tests and stability analysis of loess-mudstoneinterface landslides under heavy rainfall[J]. China Earthquake Engineering Journal, 2025, 47(2): 361-369, 392.
LiHeng, DuYan, XieMowen, et al. A new quantitative identification method for an unstable sliding rock mass[J]. Chinese Journal of Engineering, 2023, 45(9): 1441-1449.
GuoChangbao, YanYiqiu, ZhangYongshuang, et al. Research progress and prospect on deformation mechanism of large deep creep landslides in Qinghai-Tibet Plateau[J]. Earth Science, 2022, 47(10): 3677-3700.
WangLinfeng, LiLingang, YangXun. Instability initiation mechanism of gravel soil slope in Three Gorges Reservoir: case study of Hongyanzi landslide in Wushan county[J]. Chinese Journal of Geotechnical Engineering, 2018, 40(S2): 209-214.
LiuJi. Response characteristics of landslide treatment project to reservoir water level change: case of Zhangfeimiao Landslide in Three Gorges Reservoir Area[J]. Yangtze River, 2020, 51(1): 129-135, 207.
XiaoJiefu, LiYunan, HuYong, et al. Model tests on deformation characteristics of ancient bank landslide under water level fluctuation and rainfall[J]. Rock and Soil Mechanics, 2021, 42(2): 471-480.
[54]
LiY, XieX, JinB, et al. Comprehensive risk management of reservoir landslide-tsunami hazard chains: a case study of the Liangshuijing Landslide in the Three Gorges Reservoir area[J]. Landslides, 2025, 22(3): 671-691.
[55]
LiuC, HuX, ZhengH, et al. Response of landslide deformation to flood and impoundment of the Dahuaqiao Reservoir: characteristics and mechanisms[J]. Bulletin of Engineering Geology and the Environment, 2024, 83(9): 350.
HuangDa, GuDongming, ChenZhiqiang, et al. Hybrid effects of rainfall and reservoir level fluctuation on old Taping H2 landslide in Wushan County in Three Gorges Reservoir Area[J]. Chinese Journal of Geotechnical Engineering, 2017, 39(12): 2203-2211.
ChenNingsheng, WuMingyang, LiAnhui, et al. Field survey of the Zhenxiong landslide on January 22, 2024 in Yunnan province, China[J]. Mountain Research, 2024, 42(3): 422-430.
[60]
ChenH, WuH G. A stepwise discrimination method of multi-index in landslide stability monitoring[J]. Geofluids, 2022, 2022(1): 9962143.
[61]
LiY, ChenS, XuX. Automatic monitoring of Madaling geological disaster on Duyun, Guizhou Province[J]. Journal of Engineering Geology, 2014, 22(3): 482-488.
[62]
WeiJ, WangD, YangZ, et al. Characteristics and mechanism of large deformation of a reservoir colluvial landslide—a case study of the Yulinerzu Landslide in Xiluodu Reservoir, China[J]. Frontiers in Earth Science, 2024, 11: 1337998.
WuAiqing, DingXiuli, LiHuizhong, et al. Numerical simulation of startup and whole failure process of Qianjiangping Landslide using discontinuous deformation analysis[J]. Chinese Journal of Rock Mechanics and Engineering, 2006, 25(7): 1297-1303.
YangPengcheng, LiSida, HanWeige, et al. Analysis on deformation and failure mechanism of multi-weak layer composite slope in Karst region[J]. Science Technology and Engineering, 2022, 22(15): 6264-6269.
DengMaolin, ZhouJian, YiQinglin, et al. Characteristics and mechanism of deformation of chair-shaped soil landslides in Three Gorges Reservoir Area[J]. Chinese Journal of Geotechnical Engineering, 2020, 42(7): 1296-1303.
ZengZijian, XiaoHui, XuHaning, et al. Landslide surface displacement prediction based on CRITIC weight method and PSO-SVR model[J]. Science Technology and Engineering, 2024, 24(35): 14940-14946.
DuYan, LüMengjia, LiuJingnan, et al. Research and prospects on intelligent monitoring and early warning of brittle failure-type geological hazard[J]. Journal of Basic Science and Engineering, 2025, 33(3): 755-769.
LiuYuanyuan, YanXia, XiaYuanping, et al. Monitoring and analysis of surface deformation in Beijing plain using progressive SBAS-InSAR[J]. Journal of Geodesy and Geodynamics, 2023, 43(3): 239-245.
YangHe, WangLiwei, HaoShengwang. Landslide monitoring and its stability process based on an in-situ tilt monitoring system[J]. Engineering Mechanics, 2020, 37(S1): 193-199.
DuYan, ZhangHongda, XieWowen, et al. Dynamic stability evaluation method of mine goaf slopes[J]. Chinese Journal of Engineering, 2025, 47(2): 215-223.
[79]
DuY, ZhangH, NingL, et al. A step-like landslide identification and prediction method based on trend speed ratio[J]. Bulletin of Engineering Geology and the Environment, 2024, 83(12): 507.
JiangShuihua, YuanZhirong, LiuXian, et al. Rainfall infiltration model considering spatial variability of multiple layers in transition layer and its application in slope stability analysis[J]. Chinese Journal of Geotechnical Engineering, 2025, 47(2): 255-264.
ZhouJiawen, ChenMingliang, ZhaiJingkun, et al. Research and prospect on disaster-causing mechanism and prevention-control technology of reservoir landslides[J]. Advanced Engineering Sciences, 2023, 55(1): 110-128.
[84]
DuY, ZhangH, XieM, et al. A possible mechanism of high-speed and long-distance rockslides[J]. Journal of Earth Science, 2024, 35(6): 2158-2162.