The study of the effect of rocky soil fracturing on the stability of deep railway excavation slopes

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Receipt date: 
23.01.2020
Bibliographic description of the article: 

Bykova N. M., Isaev S. A., Chetvertnova V. V. Issledovaniye vliyaniya treshchinovatosti skal'nykh gruntov na ustoychivost' otkosov glubokikh vyyemok zheleznykh dorog [The study of the effect of rocky soil fracturing on the stability of deep railway excavation slopes]. Sovremennye tekhnologii. Sistemnyi analiz. Modelirovanie [Modern Technologies. System Analysis. Modeling], 2020, Vol. 65, No. 1, pp. 191–199. 10.26731/1813-9108.2020.1(65).191-199

Section: 
Year: 
2020
Journal number: 
УДК: 
625.12
DOI: 

10.26731/1813-9108.2020.1(65).191-199

Article File: 
Pages: 
191
199
Abstract: 

Adverse geotechnical conditions with the presence of fractured rocks, geodynamic and geodeformation processes are characteristic of a number of sections of currently available railways located in mountainous areas. Considering that, in fact, the process of propagation of cracks and reduction of the characteristics of rocky soil due to dynamic effects is difficult to predict, it seems relevant to study excavation work of deep cuttings composed of fractured rocks. The article discusses the justifiability of the decision on the base of a slope made during the reconstruction. The authors consider rocky cuttings with varying degrees of fracture 12, 15, 18 m deep. To assess the stability of slopes, a two-dimensional numerical model of a railway cutting for two tracks was developed. The calculations were performed in the “Midas GTS 2019” software complex. The main conclusions are based on a numerical analysis of the cutting excavation work as a finite element model of the soil body disturbed in the process of mining and subject to dynamic effects as a result of blasting during the construction or earthquakes. The influence of rock fracturing on the coefficient of stability of the railway cutting slopes is established. The main factors determining the stability of the slope are the steepness of the slopes and the fracturing of the rocky soil, which is characterized by the geological strength index (GSI) in the calculations. The dependence of the stability coefficient on the excavation soil fracturing was determined that allows one to reveal the critical fracturing level, at which the actual stability coefficient decreases to a dangerous value at the limit of equilibrium.

 

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