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Stability investigation of hill cut soil slopes along National highway 222 at Malshej Ghat, Maharashtra

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Journal of the Geological Society of India

Abstract

The section of about 12 km of National highway 222 passing through the Malshej Ghat experience frequent slope failure due to complex geological condition, heavy rainfall and slope geometry. The area is part of Western Ghat Deccan trap and slope masses are made of basalt and its weathered crust (debris/soil). The soil slope failure problem mainly occur in rainy seasons due to induced pore water pressure and reduced strength of the slope mass. The present study has been carried out to investigate the slope forming material and assess the stability of soil slopes by numerical approach. For the identification of the vulnerable zones, field study has been carried out and five vulnerable soil slopes identified namely MGS1, MGS2, MGS3, MGS4 and MGS5 on the basis of degree of weathering and slope geometry. The laboratory experiments were carried out to determine the strength properties of the geomaterials. All the input variables acquired from the field and laboratory experiments have been used for numerical simulation, which was performed with the help of limit equilibrium method (LEM) and finite element method (FEM). Numerical analysis provides understanding of the slope behaviour and illustrates that MGS1 and MGS3 are stable slopes, MGS2 and MGS4 are critically stable, whereas, slope MGS5 is unstable. This study recommend the protection of soil slopes and suggest that more detailed investigation is required for long term remedial measures to prevent risk of damage in Malshej Ghat.

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Authors and Affiliations

  1. Department of Earth Sciences, Indian Institute of Technology Bombay, Mumbai, 400 076, India

    L. K. Sharma, Ravi Kumar Umrao, Rajesh Singh, M. Ahmad & T. N. Singh

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  1. L. K. Sharma
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  2. Ravi Kumar Umrao
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  3. Rajesh Singh
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  4. M. Ahmad
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  5. T. N. Singh
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Correspondence to Ravi Kumar Umrao.

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Sharma, L.K., Umrao, R.K., Singh, R. et al. Stability investigation of hill cut soil slopes along National highway 222 at Malshej Ghat, Maharashtra. J Geol Soc India 89, 165–174 (2017). https://doi.org/10.1007/s12594-017-0580-4

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  • DOI: https://doi.org/10.1007/s12594-017-0580-4

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