NUMERICAL MODELING OF STRUCTURES FENCING EXCAVATIONS

Abstract

In this article, the peculiarities of using 3D-modeling in design of foundation pit excavations in complex geotechnical conditions are presented and shown the calculation algorithm. A comparative analysis of calculations performed using 2D and 3D models carried out. There are examples that clearly demonstrate the technical and economic effect of using 3D modeling and shown the risks that arising from ignoring the spatial effects of complex structures.

The numerical model of the structure-soil system should be selected taking into account the most significant factors determining the stress state and deformations of the system elements. In certain cases, especially in cases of dense urban development, one of the most significant factors can be the spatial variability of the structures and the soil base. There is a widely held view that 2D-models are always more "conservative", i.e. the degree of stability is determined with a margin, and that because of technical difficulties, 3D-calculations are irrational. 3D-modeling of asymmetric in the plan and for depth excavations in complex geological conditions and in conditions of dense urban development requires more complex approaches that take into account spatial effects and allow significantly improving the reliability and efficiency of calculations. The article considers situations on the example of real objects, when complex three-dimensional calculations are rational to use. The main criterion for substantiating the need to take into account spatial effects is the comparison of the results of calculations using 2D and 3D models using finite element methods.