First- and Second-Order Reliability Analysis of Rainfall-Induced Kotropi Slope Failure

被引:6
作者
Basha, B. Munwar [1 ]
Raghuram, Ammavajjala Sesha Sai [1 ,2 ]
机构
[1] Indian Inst Technol Hyderabad, Dept Civil Engn, Sangareddy 502285, Telangana, India
[2] Aalto Univ, Dept Civil Engn, 1B, Otaniemi 11000, Finland
关键词
Matric suction; Shear strength; Slope stability; Reliability index; FORM; SORM; Kotropi slope failure; SURFICIAL STABILITY; SOIL SLOPES; LANDSLIDE; INFILTRATION; HYSTERESIS; CURVE;
D O I
10.1007/s40098-022-00700-5
中图分类号
P5 [地质学];
学科分类号
0709 ; 081803 ;
摘要
First- and second-order reliability-based optimization of rainfall-triggered slope failures has not received significant attention in the past few decades. The application of first-order reliability method (FORM) and second-order reliability method (SORM) to analyze the slopes under rainfall conditions is presented in this paper. Moreover, the most appropriate continuous probability density functions (PDFs) for fitting parameters of soil water characteristic curve (SWCC) and saturated hydraulic conductivity are proposed based on minimum quantile, percentile, and cumulative distribution function (CDF) errors. The study recommends the use of the best-fit PDFs for the representation of fitting parameters alpha, n, and k(s) as Gamma, Weibull, and inverse Gaussian distributions, respectively. Furthermore, the probability of failures estimated using FORM and SORM is compared. The probability of failure estimated using FORM overestimates when compared to SORM. Moreover, the mean and coefficient of variation (COV) of the fitting parameters of SWCC and rainfall intensity have a considerable influence on the reliability index. Furthermore, the effect of rainfall intensity on the critical slip centers and critical slip surfaces is presented. The results demonstrated that there is a significant change in the critical slip surface and critical centers due to the change in rainfall intensity. In order to demonstrate the application of FORM and SORM, the rainfall-induced Kotropi slope failure in Himachal Pradesh is presented as a case study. The proposed SORM approach signifies that the Kotropi slope failure is highly likely for the normalized rainfall intensity of 0.45. Overall, the developed rigorous second-order reliability-based design optimization framework enables the assessment of the critical failure surface, critical centers, and stability of slopes under rainfall conditions considering the variability of shear strength parameters, SWCC fitting parameters, and rainfall intensity.
引用
收藏
页码:266 / 283
页数:18
相关论文
共 64 条
[1]  
[Anonymous], 1995, IS14342 BUR IND STAN
[2]  
Askarinejad A., 2012, Rivista Italiana di Geotecnica, V3, P50
[3]   Reliability analysis of unsaturated soil slopes [J].
Babu, GLS ;
Murthy, DSN .
JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING, 2005, 131 (11) :1423-1428
[4]   Target reliability-based optimisation for internal seismic stability of reinforced soil structures [J].
Basha, B. M. ;
Babu, G. L. S. .
GEOTECHNIQUE, 2012, 62 (01) :55-68
[5]   Optimum Design for External Seismic Stability of Geosynthetic Reinforced Soil Walls: Reliability Based Approach [J].
Basha, B. Munwar ;
Babu, G. L. Sivakumar .
JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING, 2010, 136 (06) :797-812
[6]   Centrifuge Model Studies on Performance of Hybrid Geosynthetic-Reinforced Slopes with Poorly Draining Soil Subjected to Rainfall [J].
Bhattacherjee, Dipankana ;
Viswanadham, B. V. S. .
JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING, 2019, 145 (12)
[7]  
Cai F., 2000, SOILS FOUND JAPAN GE, V40, P73, DOI DOI 10.3208/SANDF.40.73
[8]   Analysis of the landslide triggering mechanism during the storm of 20th-21st November 2000, in Northern Tuscany [J].
Casagli, N ;
Dapporto, S ;
Ibsen, ML ;
Tofani, V ;
Vannocci, P .
LANDSLIDES, 2006, 3 (01) :13-21
[9]   Effect of Slope Angle on the Stability of a Slope Under Rainfall Infiltration [J].
Chatterjee, Dooradarshi ;
Krishna, A. Murali .
INDIAN GEOTECHNICAL JOURNAL, 2019, 49 (06) :708-717
[10]   Reliability analysis of soil-water characteristics curve and its application to slope stability analysis [J].
Chiu, C. F. ;
Yan, W. M. ;
Yuen, Ka-Veng .
ENGINEERING GEOLOGY, 2012, 135 :83-91