Designing and Explanation of Reinforcement of Operated High Fills with the Injection of Solidifying Solutions

Abstract

Stability loss of slopes of the operated high fills is associated with a complex of adverse factors. Formation of glide lines under loss of stability is of the probabilistic nature and depends on the soil physical and mechanical properties as well as on the weakened zones location. Loss of stability of the slope parts of the fill can occur according to various scenarios, for each of which its own reinforcement zones location is possible. Therefore, in order to assess the reinforcement zones of high fills and to further determine the optimal reinforcement schemes, three structural designs of high fills are considered, which model various scenarios of the stability loss. Numerical modeling allowed us to assess the stress-strain state of the high fill in operation and to identify the most adverse zones in the subgrade body that are of high priority for reinforcement – locations of weak zones. Assessment of reinforcement zones of the high fills in operation alongside with identification of their locations as well as evaluation of the nature of the stress-strain state are made based on the results of modeling the deformations and the stability loss of the high fill according to the revealed effects of the loads heavy impact with the application of the finite element method. Models of the operated high fills strengthened by reinforcement with the injection of solidifying solutions are theoretically substantiated and developed. For each model, an element-by-element description is performed and its application conditions are justified. Reinforcement elements in the models are selected with due regard to peculiarities of the stress-strain state in the zones which need reinforcement. Modeling the operation of the reinforced exploited high fills is carried out according to modern approaches to the mechanics description of the anisotropic medium that is represented by the soil mass which contains its reinforcing elements.