Abstract
Identifying deep-seated toppling failure presents unique challenges for the study of natural slope deformation in mountainous regions. In the absence of an effective quantitative approach, this study aims to provide a comprehensive grading system in order to establish a slope engineering geological model that can evaluate the deformation of a deep-seated metamorphic toppling slope. The toppling slope used in this study, located in Zhala, southwest China, affects a large area with a deformed rock mass of over 2.5 million m3. In order to objectively reflect the intensity of rock mass toppling, the deformation phenomena of this deep-seated toppling slope are first described in detail. Then, a grading index system is proposed to evaluate the degree of toppling deformation. This comprehensive index system includes the dip angle change of the rock strata, tensile cracks, rock mass structure, weathering grade, and longitudinal wave velocity. The toppling slope is divided into four toppling intensity zones: a completely toppled zone, a highly toppled zone, a moderately toppled zone, and an un-toppled zone. The detailed description and subdivision of the degree of deep-seated toppling deformation is the basis of establishing a fine engineering geological model. Different from the previous when the bottom boundary of toppling was considered as the only potential control boundary, this paper reveals that there may be multiple potential control slip zones in the deep-seated toppling slope, and different deformation degree zones correspond to different stability. As an engineering slope, engineering treatment measures can be formulated according to the degree of toppling deformation.
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References
Adhikary DP, Dyskin AV (2007) Modelling of progressive and instantaneous failures of foliated rock slopes. Rock Mech Rock Eng 40(4):349–362
Adhikary DP, Dyskin AV, Jewell RJ (1996) Numerical modelling of the flexural deformation of foliated rock slopes. Int J Rock Mech Min Sci Geomech Abstr 33(6):595–606
Adhikary DP, Dyskin AV, Jewell RJ, Stewart DP (1997) A study of the mechanism of flexural toppling failure of rock slopes. Rock Mech Rock Eng 30(2):75–93
Alejano LR, Carranza-Torres C, Giani GP, Arzúa J (2015) Study of the stability against toppling of rock blocks with rounded edges based on theoretical and experimental approaches. Eng Geol 195:172–184
Aydan O, Kawamoto T (1987) Toppling failure of discontinuous rock slopes and their stabilization. J Min Metall Inst Jpn 103:763–770
Aydan O, Kawamoto T (1992) The stability of slopes and underground openings against flexural toppling and their stabilisation. Rock Mech Rock Eng 25(3):143–165
Bovis MJ (1990) Rock-slope deformation at Affliction Creek, southern Coast Mountains, British Columbia. Can J Earth Sci 27(2):243–254
De Freitas MH, Watters RJ (1973) Some field examples of toppling failure. Geotechnique 23(4):495–514
Evans SG, De Graff JV (2002) Catastrophic landslides: effects, occurrence and mechanisms. Geological Society of America, Boulder
Goodman RE (1989) Introduction to rock mechanics, 2nd edn. Wiley, New York
Goodman RE, Bray JW (1976) Toppling of rock slopes. In: Proceedings of the ASCE specialty conference on rock engineering for foundations and slopes, Boulder, Colorado, August 1976, vol 2, pp 201–234
Hoek E, Bray J (1977) Rock slope engineering, first ed. IMM, London
Huang RQ (2013) Engineering geology analysis of stability of rock high slope. Science Press, Beijing (In Chinese)
Huang RQ (2015) Understanding the mechanism of deep-seated landslides. Engineering geology for society and territory-Volume 2, Springer. pp 13–32
Huang RQ, Li YS, Yan M (2017) The implication and evaluation of toppling failure in engineering geology practice. J Eng Geol 25(5):1165–1181 (In Chinese)
Ishida T, Chigira M, Hibino S (1987) Application of the distinct element method for analysis of toppling observed on a fissured rock slope. Rock Mech Rock Eng 20(4):277–283
ISRM (1978) Internal Society for Rock Mechanics Commission on standardization of laboratory and field tests, suggested methods for the quantitative description of discontinuities in rock mass. Int J Rock Mech Min Sci Geomech Abstr 15:319–368
Leandro RA, Ivan GM, Roberto MA (2010) Analysis of a complex toppling-circular slope failure. Eng Geol 114(1):93–104
Lee CF, Wang S, Huang Z (1999) Evaluation of susceptibility of laminated rock to bending-toppling deformation and its application to slope stability study for the Longtan hydropower project on the Red Water River, Guangxi, China. 9th ISRM Congress, International Society for Rock Mechanics
Liu M, Liu FZ, Huang RQ et al (2016) Deep-seated large-scale toppling failure in metamorphic rocks: a case study of the Erguxi slope in southwest China. J Mt Sci 13:2094–2110. https://doi.org/10.1007/s11629-015-3803-4
Nichol SL, Hungr O, Evans SG (2002) Deep-seated brittle and ductile toppling of rock slopes. Can Geotech J 39(4):773–788. https://doi.org/10.1139/t02-027
Regmi AD, Yoshida K, Nagata H, Pradhan B (2014) Rock toppling assessment at Mugling-Narayanghat road section: “a case study from Mauri Khola landslide”, Nepal. Catena 114:67–77. https://doi.org/10.1016/j.catena.2013.10.013
Smith JV (2015) Self-stabilization of toppling and hillside creep in layered rocks. Eng Geol 196:139–149
Wang S (1981) On the mechanism and process of slope deformation in an open pit mine. Rock Mech Rock Eng 13(3):145–156
Zhang Z, Liu G, Wu S et al (2015) Rock slope deformation mechanism in the Cihaxia Hydropower Station, Northwest China. Bull Eng Geol Environ 74(3):943–958
Zhou H, Nie D, Li S (2012) Integrated analysis of formation mechanism for deep-seated toppling rock mass of a hydropower station on Lancangjiang River. Adv Sci Technol Water Resour 32(3):48–52 (In Chinese)
Funding
This study was financially supported by the National Natural Science Foundation of China (41907250), the Foundation of the State Key Laboratory of Geohazard Prevention and Geoenvironment Protection (Grant No. SKLGP2018Z014), and the Foundation for Innovative Research Groups of the National Natural Science Foundation of China (Grant No. 41521002).
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Zhao, W., Zhang, C. & Ju, N. Identification and zonation of deep-seated toppling deformation in a metamorphic rock slope. Bull Eng Geol Environ 80, 1981–1997 (2021). https://doi.org/10.1007/s10064-020-02027-y
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DOI: https://doi.org/10.1007/s10064-020-02027-y