Abstract
As a typical hard soil and soft/weak rock, the Xigeda formation is a set of Cenozoic lacustrine semi-rock discontinuously distributed in south-western China. Engineering practice shows that water exerts a significant influence on the mechanical properties of the Xigeda formation. X-ray powder diffraction (XRD), scanning electron microscopy (SEM), and triaxial compression tests were conducted by means of in situ sampling of the Xigeda formation in Zhaizi village along the Jiasha River. The mineral composition and microstructure were determined, the deformation and failure mechanisms were investigated, and influences of the water content on both deformation and strength indices were discussed. The results show that (a) the Xigeda formation has a characteristic weakly cemented structure, which differs from that of soil and rock, and this cemented structure is easily damaged under saturated conditions; (b) with increasing water content, both average modulus and shear strength of the Xigeda formation decrease significantly, and influence of water content on peak strength is much greater than that on residual strength; and (c) in the range of tested conditions (w = 17.79 ~ 30.83%, σ3 = 200 ~ 800 kPa), both the peak and residual strengths meet the Mohr–Coulomb criterion. The results can provide an experimental basis and mechanism informing engineering practice in the Xigeda formation.
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References
Abolmasov B, Milenković S, Marjanović M, Đurić U, Jelisavac B (2014) A geotechnical model of the Umka landslide with reference to landslides in weathered Neogene marls in Serbia. Landslides 12(4):689–702
Alonso EE, Pinyol NM (2014) Slope stability in slightly fissured claystones and marls. Landslides 12(4):643–656
Aversa S, Evangelista A (1998) The mechanical behaviour of a pyroclastic rock: yield strength and destructuration effects. Rock Mech Rock Eng 31(1):25–42
Barla G, Barbero M, Castelletto M, Maderni G (1998) A case of plane shear slope instability during the severe rainfall event of 4–6 November 1994 in Piemonte (Italy). 2nd International Symposium on Hard Soils and Soft Rocks, Naples (Italy), 12–14 October 1998
Cecconi M, Viggiani GM (2001) Structural features and mechanical behaviour of a pyroclastic weak rock. Int J Numer Anal Meth Geomech 25(15):1525–1557
Clayton CRI, Serratrice JF (1993) The mechanical properties and behaviour of hard soils and soft rocks. Proceedings of the International Symposium on Geotechnical Engineering of Hard Soils and Soft Rocks, Athens 3:1839–1877
Corominas J, Martínez-Bofill J, Soler A (2014) A textural classification of argillaceous rocks and their durability. Landslides 12(4):669–687
Di Maio C, Scaringi G, Vassallo R (2014) Residual strength and creep behaviour on the slip surface of specimens of a landslide in marine origin clay shales: influence of pore fluid composition. Landslides 12(4):657–667
Gens A, Nova R (1993) Conceptual bases for a constitutive model for bonded soils and weak rocks. Proceedings of the International Symposium on Geotechnical Engineering of Hard Soils and Soft Rocks. Athens 1:447–455
Gens A, Vaunat J, Garitte B (2005) Elastoplastic modelling of hard soils and soft rocks: formulation and application. VIII Int. Conf. Computational Plasticity, COMPLAS VIII, Barcelona
Hornig ED, Klapperich H (2011) Laboratory tests and field measurements investigating the stress strain behaviour of foundations on hard soil and weak rock. In: Anagnostopoulos A, Pachakis M, Tsatsanifos C (eds) Geotechnics of hard soils-weak rocks: Proceedings of the 15th European conference on soil mechanics and geotechnical engineering. IOS Press, Athens, Greece, pp 737–742
Kanji MA (2014) Critical issues in soft rocks. J Rock Mech Geotech Eng 6(3):186–195
Kavvadas M, Amorosi A (2000) Constitutive models for structured soils. Geotechnique 50(3):263–273
Kong P, Granger DE, Wu FY, Caffee MW, Wang YJ, Zhao XT, Zheng Y (2009) Cosmogenic nuclide burial ages and provenance of the Xigeda paleo-lake: implications for evolution of the Middle Yangtze River. Earth Planet Sci Lett 278:131–141
Li P, Liu XS, Yang ME, Yuan JL (2012) Analysis of generation factors for tectonic deformation, in the Xigeda formation in southwestern China. Analysis of generation factors for tectonic deformation in the Xigeda formation in southwestern China. Eng Sci 10(1):8–13
Ling S, Wu X, Liao X, Li X, Zhao S (2015) Study on the water-rock interaction behavior of Xigeda strata in Lamaxi Gully, Sichuan Province, China. In: Lollino G et al (eds) Engineering Geology for Society and Territory -, vol 2. Springer, Cham, pp 2107–2111
Liu HJ, Nie DX (2004) A summary of the study of Xigeda Strata. Adv Earth Sci 19:80–82. (In Chinese with English Abstract)
McCammon N (1999) Book review: The geotechnics of hard soils-soft rocks. Can Geotech J 36(6):1206–1206
Moon VG (1993) Geotechnical characteristics of ignimbrite: a soft pyroclastic rock type. Eng Geol 35(1–2):33–48
Picarelli L (2015) Landslides in hard soils and weak rocks. Landslides 12(4):641–641
Quaternary Glacier Survey Group (1977) Preliminary study on Xigeda formation in southwest China. In: Institute of Geomechanics, Chinese Academy of Geological Sciences (ed) Collection on Quaternary Glacial Geology of China. Geological Publishing House, Beijing, pp 144–154. (In Chinese)
Rotaru A (2011) Landslides triggered in hard soils and soft rocks in Romania. In: Anagnostopoulos A, Pachakis M, Tsatsanifos C (eds) Geotechnics of hard soils-weak rocks: Proceedings of the 15th European conference on soil mechanics and geotechnical engineering. IOS Press, Athens, Greece, pp 1383–1388
Shao JF (1998) Poroelastic behaviour of brittle rock materials with anisotropic damage. Mech Mater 30:41–53
Shang T (2012) Research on micro-characteristic of CH8 oil reservoir of Yanchang formation in HuaQing area of the Ordos Basin. Northwest University. (In Chinese)
Sitarenios P, Bardanis M, Kavvadas M (2011) Modelling the soil-water characteristic curve of structured and recomposed hard soils-weak rocks. In: Anagnostopoulos A, Pachakis M, Tsatsanifos C (eds) Geotechnics of hard soils-weak rocks: Proceedings of the 15th European conference on soil mechanics and geotechnical engineering. IOS Press, Athens, Greece, pp 665–670
Sun ZF, Qu HL, Wu XX (2012) Research on the axial load transmission function of cast-in-place pile in Xigeda rock stratum. Adv Mat Res 594–597:612–615
Tatsuoka F, Kohata Y (1995) Stiffness of hard soils and soft rocks in engineering applications. Proc. 1st Int. Symp Prefailure Deformation Characteristics of Geomaterials, Sapporo 2:947–1063
Tommasi P, Verrucci L, Rotonda T (2014) Mechanical properties of a weak pyroclastic rock and their relationship with microstructure. Can Geotech J 52(2):1–13
Vaughan PR (1993) Engineering behavior of weak rocks: some answers and some questions. Proceedings of the International Symposium on Geotechnical Engineering of Hard Soils and Soft Rocks, Athens 3:1741–1765
Vukadin V (2007) Modeling of the stress-strain behavior in hard soils and soft rocks. Acta Geotechnica Slovenica 2(2):5–15
Wang W, Chen W, Long W, Die J (2018) Research and analysis on the landslide characteristics of Xigeda soil slope. American Institute of Physics Conference Series. American Institute of Physics Conference Series. AIP Conference Proceedings 1944, 020012
Xu ZM (2011) Deposits of Zhaizi village landslide-dammed lake along Jinsha River and its implication for the genesis of Xigeda Formation. Geogr Rev 57(5):675–686. (In Chinese with English Abstract)
Xu ZM, Liu WL (2011) Some problems in the study of the genesis of Xigeda Formation. Earth Sci Front 18(5):256–270 (In Chinese with English Abstract)
Yang SH, Su LJ, Zhang CL, Li C, Hu BL (2020) Analysis of seepage characteristics and stability of Xigeda Formation slope under heavy rainfall. Journal of Civil and Environmental Engineering. http://kns.cnki.net/kcms/detail/50.1218.TU.20200224.1823.004.html. (In Chinese with English Abstract)
Yuan FL (1958) Some stratigraphical material from southwestern area. China Quaternaria Sinica 1(2):130–140 (In Chinese)
Zhang S (2009) Geological formation names of China (1866–2000). Springer, pp 1250
Zhang YS, Qu YX (2000) Definition of hard soil-soft rock and its discrimination and classification. Geological Science and Technology Information 19(1):77–80. (In Chinese with English Abstract)
Zhou P, Wang ZJ, Xu HY, Zhao QC, Sun CS (2017) Stability and sub-classification study on the tunnel surrounding rock of Xigeda strata considering the influence of moisture content. Chin Civil Eng J 50(12):97–110 (In Chinese with English Abstract)
Zhou LG (2016) Research on the microscopic features and mechanical properties of silty sands used in subgrade in seasonally frozen region. Jilin Jianzhu University. (In Chinese)
Zimbardo M, Cannone C, Ercoli L, Nocilla A (2018) A risk assessment proposal for underground cavities in Hard Soils-Soft Rocks. Int J Rock Mech Min Sci 103:43–54
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The work reported in this paper is financially supported by the Youth Innovation Promotion Association CAS (No. 2021325), the National Natural Science Foundation of China (No. 52179117), and the International Partnership Program of Chinese Academy of Sciences Grant No. 131551KYSB20180042.
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Fu, X., Du, Y., Sheng, Q. et al. Influences of water on the microstructure and mechanical behavior of the Xigeda formation. Bull Eng Geol Environ 81, 72 (2022). https://doi.org/10.1007/s10064-022-02567-5
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DOI: https://doi.org/10.1007/s10064-022-02567-5