Assessment of the reasons for the loss of stability of the retaining wall and the choice of slope stabilization options, taking into account the use of retaining walls of different rigidity
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Abstract
An assessment of the reasons for the loss of stability of the sliding slope and the manifestation of significant movements of the existing retaining walls is presented, as well as the selection of measures to stabilize the slope by installing one of the variants of retaining walls of different rigidity is performed.
To assess the stability of the slope and select the effective parameters of the retaining walls, a numerical simulation of the stress-strain state (SSS) of the elements "soil massif of the slope - retaining walls" was performed. Modeling was carried out by the method of finite elements using the "Plaxis" software complex in a non-linear setting, taking into account changes in the parameters of structures and soils at different stages of modeling.
An assessment of the real movements of the retaining walls and the reasons for the loss of slope stability at the initial stage was carried out using geodetic monitoring.
A characteristic engineering-geological section in the zone of the greatest deformations of the existing anti-slide structures was chosen for modeling the calculation scheme.
Numerical calculations of the retaining walls, which were carried out using the finite element method, involve taking into account the technological sequence of the construction of the retaining walls and modeling the step-by-step development of the pit. Modeling was performed in several stages:
1) Formation of soil SSS in the current natural state;
2) Assessment of the stability of the slope before the start of construction, in the presence of an old massive retaining wall made of limestone blocks.
3) Assessment of the stability of the slope in the version of the original design solution with a retaining wall made of short bored piles with a diameter of 820 mm and taking into account the development of the pit to the design mark.
4) Modeling of SSS elements "soil array of the slope - retaining walls" with different options of the new retaining wall in order to choose an effective option that will ensure the possibility of developing the pit to the design marks and stabilizing the slope.
Based on the results of numerical modeling of slope stabilization options with retaining walls of different designs and rigidity, the consumption of materials for each of the options was determined and the most effective option was selected.
Studies have shown that depending on the change in the spatial rigidity of the retaining walls by introducing additional elements (buttresses, struts) it is possible to obtain an optimal solution and, in the future, to effectively design a complex of anti-landslide structures.
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