Abstract
Landslides frequently occur on cutting slopes with weak rock during the rainy season. An understanding of the failure mechanism is essential for designers to adopt effective measures to mitigate potential impacts caused by landslides. Based on an enormous number of highway slope practices in Guangdong Province, China, this paper presents a whole train of numerical investigations on the hydraulic response and stability of weak rock slopes subject to a subtropical climate where the average annual rainfall is approximately 1,800 – 2,000 mm. This study explored a different failure mechanism of three different types of weak rock slopes in a modeling approach. A physics-based slope model coupled with a hydrological model is used to simulate the factor of safety and porewater pressure development of unsaturated slopes with various rock masses under diverse rainfall scenarios. The input parameters were determined from the rainfall intensity–duration–frequency (IDF) curves of regional hydrological conditions to comprehensively consider the impact of rainfall. The general suction range of rock masses was acquired using three hydraulic characteristic curves associated with sandstone, siltstone, and mudstone. Furthermore, the failure models of weak rock slopes under different rainfall conditions were assessed. Based on the theory of regional hydrology, a unified rainfall and intensity-duration threshold for different weak rock slopes was established. The results indicate that both siltstone and mudstone slopes are more sensitive to long-term rainfall than short-term rainstorms. However, the sandstone slope appears to be unstable under regional rainfall conditions of 40-year return periods. This also proves that the instability mode of the siltstone slope exhibits a retrogressive type in which the sliding surface of the slope increases with an increase in rainfall duration. Translational shallow landslides occurred in the transient saturation zone of the sandstone slope, and the depth of the failure plane was independent of rainfall patterns and duration. This study revealed the instability mechanism and provided a robust early warning measure for weak rock slopes by fusing engineering geology and regional hydraulics, providing insightful information for mitigating potential landslide disasters. The proposed model can also be used to predict the possible infiltration depth of rainfall and the spatial location of the sliding surface, prior to construction to assess whether slope stabilization and reinforcement measures are needed.
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References
Areias P, Rabczuk T (2017) Steiner-point free edge cutting of tetrahedral meshes with applications in fracture. Finite Elements in Analysis and Design 132:27–41, DOI: https://doi.org/10.1016/j.finel.2017.05.001
Areias P, Rabczuk T, Dias-da-Costa D (2013) Element-wise fracture algorithm based on rotation of edges. Engineering Fracture Mechanics 110:113–137, DOI: https://doi.org/10.1016/j.engfracmech.2013.06.006
Areias P, Reinoso J, Camanho PP, César de Sá J, Rabczuk T (2018) Effective 2D and 3D crack propagation with local mesh refinement and the screened poisson equation. Engineering Fracture Mechanics 189:339–360, DOI: https://doi.org/10.1016/j.engfracmech.2017.11.017
Berti M, Bertello L, Bernardi AR, Caputo G (2017) Back analysis of a large landslide in a flysch rock mass. Landslides 14:2041–2058, DOI: https://doi.org/10.1007/s10346-017-0852-5
Biot MA (1941) General theory of three-dimensional consolidation. Journal of Applied Physics 12:155–164
Borgatti L, Corsini A, Barbieri M, Sartini G, Truffelli G, Caputo G, Puglisi C (2006) Large reactivated landslides in weak rock masses: A case study from the Northern Apennines (Italy). Landslides 3:115–124, DOI: https://doi.org/10.1007/s10346-005-0033-9
Brown ET (1981) Rock characterization, testing & monitoring: ISRM suggested methods. Commission on Testing Methods, International Society for Rock Mechanics
Caine N (1980) The rainfall intensity: Duration control of shallow landslides and debris flows. Geografiska Annaler Series A, Physical Geography 62:23–27, DOI: https://doi.org/10.2307/520449
Ding XP (2018) Optimization analysis on the presser foot tracing distance of internal dumping in open-pit mine based on 3DEC. Coal Engineering 2018(5):37–40
Elkamhawy E, Wang H, Zhou B, Yang Z (2018) Failure mechanism of a slope with a thin soft band triggered by intensive rainfall. Environmental Earth Sciences 77, DOI: https://doi.org/10.1007/s12665-018-7538-8
Fredlund DG, Morgenstern NR, Widger RA (1978) The shear strength of unsaturated soils. Canadian Geotechnical Journal 15:313–321, DOI: https://doi.org/10.1139/t78-029
Geo-Slope (2012) Seep/w user’s guide for finite element seepage analysis. Geo-Slope International Ltd., Calgary, AB, Canada
Giri P, Ng K, Phillips W (2018) Laboratory simulation to understand translational soil slides and establish movement criteria using wireless IMU sensors. Landslides 15:2437–2447, DOI: https://doi.org/10.1007/s10346-018-1055-4
Haug MD, Sauer EK, Fredlund DG (1977) Retrogressive slope failures at beaver creek, south of Saskatoon, Saskatchewan, Canada. Canadian Geotechnical Journal 14:288–301, DOI: https://doi.org/10.1139/t77-035
He M (2014) Latest progress of soft rock mechanics and engineering in China. Journal of Rock Mechanics and Geotechnical Engineering 6:165–179, DOI: https://doi.org/10.1016/j.jrmge.2014.04.005
Hu QJ, Shi RD, Zheng LN, Cai QJ, Du LQ, He LP (2018) Progressive failure mechanism of a large bedding slope with a strain-softening interface. Bulletin of Engineering Geology and the Environment 77:69–85, DOI: https://doi.org/10.1007/s10064-016-0996-x
Li L, Ju N (2016) Effect of the inclined weak interlayers on the rainfall response of a bedded rock slope. Journal of Mountain Science 13:1663–1674, DOI: https://doi.org/10.1007/s11629-015-3594-7
Li Q, Wang YM, Zhang KB, Yu H, Tao ZY (2020) Field investigation and numerical study of a siltstone slope instability induced by excavation and rainfall. Landslides 17:1485–1499, DOI: https://doi.org/10.1007/s10346-020-01396-5
Liu C-N, Dong J-J, Chen C-J, Lee W-F (2011) Typical landslides and related mechanisms in Ali Mountain highway induced by typhoon Morakot: Perspectives from engineering geology. Landslides 9:239–254, DOI: https://doi.org/10.1007/s10346-011-0298-0
Lu N (2013) Hillslope hydrology and stability. Canadian Water Resources Journal 40:407–408
Lu N, Şener-Kaya B, Wayllace A, Godt JW (2012) Analysis of rainfall-induced slope instability using a field of local factor of safety. Water Resources Research 48, DOI: https://doi.org/10.1029/2012WR011830
Lu N, Wayllace A, Oh S (2013) Infiltration-induced seasonally reactivated instability of a highway embankment near the Eisenhower tunnel, Colorado, USA. Engineering Geology 162:22–32, DOI: https://doi.org/10.1016/j.enggeo.2013.05.002
Ma S, Xu C, Shao X, Zhang P, Liang X, Tian Y (2019) Geometric and kinematic features of a landslide in Mabian Sichuan, China, derived from UAV photography. Landslides 16:373–381, DOI: https://doi.org/10.1007/s10346-018-1104-z
Marko K, Tiit H, Peeter T, Volli K (2010) Analysis of a retrogressive landslide in glaciolacustrine varved clay. Engineering Geology 116:109–116, DOI: https://doi.org/10.1016/j.enggeo.2010.07.012
Morgenstern NR, Price VE (1965) The analysis of the stability of general slip surfaces. Géotechnique 15:79–93, DOI: https://doi.org/10.1680/geot.1965.15.1.79
Mu W, Wu X, Qian C, Wang K (2019) Triggering mechanism and reactivation probability of loess-mudstone landslides induced by rainfall infiltration: A case study in Qinghai Province, Northwestern China. Environmental Earth Sciences 79, DOI: https://doi.org/10.1007/s12665-019-8767-1
Mualem Y (1976) A new model for predicting the hydraulic conductivity of unsaturated porous media. Water Resources Research 12:513–522, DOI: https://doi.org/10.1029/WR012i003p00513
Nguyen LC, Tien PV, Do T-N (2019) Deep-seated rainfall-induced landslides on a new expressway: A case study in Vietnam. Landslides 17:395–407, DOI: https://doi.org/10.1007/s10346-019-01293-6
Oh S, Lu N (2015) Slope stability analysis under unsaturated conditions: Case studies of rainfall-induced failure of cut slopes. Engineering Geology 184:96–103, DOI: https://doi.org/10.1016/j.enggeo.2014.11.007
Oliveira R (1993) Weak rock materials. In: The engineering geology of weak rock. Balkema, Rotterdam, Netherlands
Pan Y, Wu G, Zhao Z, He L (2020) Analysis of rock slope stability under rainfall conditions considering the water-induced weakening of rock. Computers and Geotechnics 128:103806, DOI: https://doi.org/10.1016/j.compgeo.2020.103806
Pánek T, Brázdil R, Klimeš J, Smolková V, Hradecký J, Zahradníček P (2011) Rainfall-induced landslide event of May 2010 in the eastern part of the Czech Republic. Landslides 8:507–516, DOI: https://doi.org/10.1007/s10346-011-0268-6
Petley DN, Higuchi T, Petley DJ, Bulmer MH, Carey J (2005) Development of progressive landslide failure in cohesive materials. Geology 33:201–204, DOI: https://doi.org/10.1130/g21147.1
Qiang Y, Zhang L, Xiao T (2020) Spatial-temporal rain field generation for the Guangdong-Hong Kong-Macau Greater Bay Area considering climate change. Journal of Hydrology 583:124584, DOI: https://doi.org/10.1016/j.jhydrol.2020.124584
Rabczuk T, Belytschko T (2004) Cracking particles: A simplified meshfree method for arbitrary evolving cracks. International Journal for Numerical Methods in Engineering 61:2316–2343, DOI: https://doi.org/10.1002/nme.1151
Regmi RK, Jung K, Nakagawa H, Kang J (2014) Study on mechanism of retrogressive slope failure using artificial rainfall. CATENA 122:27–41, DOI: https://doi.org/10.1016/j.catena.2014.06.001
Robinson JD, Vahedifard F, AghaKouchak A (2017) Rainfall-triggered slope instabilities under a changing climate: Comparative study using historical and projected precipitation extremes. Canadian Geotechnical Journal 54:117–127, DOI: https://doi.org/10.1139/cgj-2015-0602
Tan F-L, Hu X-L, Zhang Y-M, He C-C, Zhang H (2016) Study of progressive failure processes and stabilities of different types of landslides. Yantu Lixue/Rock and Soil Mechanics 37:597–606, DOI: https://doi.org/10.16285/j.rsm.2016.S2.075
Tang G, Huang J, Sheng D, Sloan SW (2018) Stability analysis of unsaturated soil slopes under random rainfall patterns. Engineering Geology 245:322–332, DOI: https://doi.org/10.1016/j.enggeo.2018.09.013
Terzaghi K (1959) Theoretical soil mechanics. John Wiley & Sons, Inc., Hoboken, NJ, USA
van Genuchten MT (1980) A closed-form equation for predicting the hydraulic conductivity of unsaturated soils. Soil Science Society of America Journal 44:892–898, DOI: https://doi.org/10.2136/sssaj1980.03615995004400050002x
Vu-Bac N, Lahmer T, Zhuang X, Nguyen-Thoi T, Rabczuk T (2016) A software framework for probabilistic sensitivity analysis for computationally expensive models. Advances in Engineering Software 100:19–31, DOI: https://doi.org/10.1016/j.advengsoft.2016.06.005
Wang B, Vardon PJ, Hicks MA (2016) Investigation of retrogressive and progressive slope failure mechanisms using the material point method. Computers and Geotechnics 78:88–98, DOI: https://doi.org/10.1016/j.compgeo.2016.04.016
Wang HL, Xu WY, Shao JF (2014) Experimental researches on hydromechanical properties of altered rock under confining pressures. Rock Mechanics and Rock Engineering 47:485–493, DOI: https://doi.org/10.1007/s00603-013-0439-y
Wang S, Zheng H, Li C, Ge X (2011) A finite element implementation of strain-softening rock mass. International Journal of Rock Mechanics and Mining Sciences 48:67–76, DOI: https://doi.org/10.1016/j.ijrmms.2010.11.001
Wu LZ, Huang RQ, Xu Q, Zhang LM, Li HL (2015) Analysis of physical testing of rainfall-induced soil slope failures. Environmental Earth Sciences 73:8519–8531, DOI: https://doi.org/10.1007/s12665-014-4009-8
Xu Y, Li J, Fan H, Chen L, Zhao Y, Li L (2017) Stability analysis of clastic rock slope with mudstone interlayer under rainfall infiltration. Geotechnical and Geological Engineering 35:1871–1883, DOI: https://doi.org/10.1007/s10706-017-0215-y
Yang Z, Qiao J, Uchimura T, Wang L, Lei X, Huang D (2017a) Unsaturated hydro-mechanical behaviour of rainfall-induced mass remobilization in post-earthquake landslides. Engineering Geology 222:102–110, DOI: https://doi.org/10.1016/j.enggeo.2017.04.001
Yang KH, Nguyen TS, Li YH, Leshchinsky B (2019a) Performance and design of reinforced slopes considering regional hydrological conditions. Geosynthetics International 26:451–473, DOI: https://doi.org/10.1680/jgein.19.00031
Yang K-H, Nguyen TS, Rahardjo H, Lin D-G (2020) Deformation characteristics of unstable shallow slopes triggered by rainfall infiltration. Bulletin of Engineering Geology and the Environment, DOI: https://doi.org/10.1007/s10064-020-01942-4
Yang KH, Thuo JN, Chen JW, Liu CN (2019b) Failure investigation of a geosynthetic-reinforced soil slope subjected to rainfall. Geosynthetics International 26:42–65, DOI: https://doi.org/10.1680/jgein.18.00035
Yang K-H, Uzuoka R Thuo J Naa, Lin G-L, Nakai Y (2017b) Coupled hydro-mechanical analysis of two unstable unsaturated slopes subject to rainfall infiltration. Engineering Geology 216:13–30, DOI: https://doi.org/10.1016/j.enggeo.2016.11.006
Yang G, Zhong Z, Zhang Y, Fu X (2016) Analysis of mechanism and mechanical characteristics of landslide disaster. Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering 35:4009–4017, DOI: https://doi.org/10.13722/j.cnki.jrme.2016.0804 (in Chinese)
Zhan J, Wang Q, Zhang W, Shangguan Y, Song S, Chen J (2019) Soilengineering properties and failure mechanisms of shallow landslides in soft-rock materials. Catena 181:104093, DOI: https://doi.org/10.1016/j.catena.2019.104093
Zhang K, Cao P, Bao R (2013) Progressive failure analysis of slope with strain-softening behaviour based on strength reduction method. Journal of Zhejiang University SCIENCE A 14:101–109, DOI: https://doi.org/10.1631/jzus.A1200121
Zhang S, Xu Q, Hu Z (2016) Effects of rainwater softening on red mudstone of deep-seated landslide, Southwest China. Engineering Geology 204:1–13, DOI: https://doi.org/10.1016/j.enggeo.2016.01.013
Zhang S, Xu Q, Zhang Q (2017) Failure characteristics of gently inclined shallow landslides in Nanjing, Southwest of China. Engineering Geology 217:1–11, DOI: https://doi.org/10.1016/j.enggeo.2016.11.025
Zhang M, Yin Y, Huang B (2015) Mechanisms of rainfall-induced landslides in gently inclined red beds in the eastern Sichuan basin, SW China. Landslides 12:973–983, DOI: https://doi.org/10.1007/s10346-015-0611-4
Zhang S, Zhang X, Pei X, Wang S, Huang R, Xu Q, Wang Z (2019) Model test study on the hydrological mechanisms and early warning thresholds for loess fill slope failure induced by rainfall. Engineering Geology 258:105135, DOI: https://doi.org/10.1016/j.enggeo.2019.05.012
Zhang J, Zhu D, Zhang S (2020) Shallow slope stability evolution during rainwater infiltration considering soil cracking state. Computers and Geotechnics 117:103285, DOI: https://doi.org/10.1016/j.compgeo.2019.103285
Zheng Y, Chen C, Liu T, Xia K, Sun C, Chen L (2019) Analysis of a retrogressive landslide with double sliding surfaces: A case study. Environmental Earth Sciences 79, DOI: https://doi.org/10.1007/s12665-019-8741-y
Zhou Z, Cai X, Cao W, Li X, Xiong C (2016) Influence of water content on mechanical properties of rock in both saturation and drying processes. Rock Mechanics and Rock Engineering 49:3009–3025, DOI: https://doi.org/10.1007/s00603-016-0987-z
Zhou C, Yang X, Liang Y, Du Z, Liu Z, Huang W, Ming W (2019) Classification of red-bed rock mass structures and slope failure modes in South China. Geosciences 9:273, DOI: https://doi.org/10.3390/geosciences9060273
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This research was financially supported by the National Key R&D Program of China (2016YFC0802500) and the Traffic Science and Technology Project of Guangdong Province (2014-02-04).
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Li, Q., Wang, Y. & Zhang, K. Failure Mechanism of Weak Rock Slopes considering Hydrological Conditions. KSCE J Civ Eng 26, 685–702 (2022). https://doi.org/10.1007/s12205-021-1198-z
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DOI: https://doi.org/10.1007/s12205-021-1198-z