NUMERICAL STRENGTH CALCULATIONS OF UNDERGROUND GAS PIPELINES IN UNDERMINING AREAS

Introduction . Various calculation methods, including empirical, analytical, and numerical ones, are used to assess the effect of undermining on base deformations force variations in structures existing projected pipelines. Empirical methods typically developed using an experimental analysis numerous results obtained during engineering geodetic observations settlements surface terrain shifts areas. However, such fail take into account all factors affecting underground excavations, vertical heterogeneity physicomechanical properties soils, etc. Aim To determine advantages develop a methodology for calculations Plaxis Midas GTS NX geotechnical software applications. Compared empirical analytical approaches have advantage simulating bedding geological elements their properties, ensuring joint “underground excavation – soil massif structure” system, considering gradual character technology, as well providing possibility search through large quantity variants over short period time. The principles strength main gas pipelines arrangement closed excavations mineral mining considered. Methods is based degree nature effects produced by various modeling results, presence pipeline design model, width model calculated area, finite element mesh sizes, parameters geomechanical width, depth, dip angle, thickness, number mined formations, problem statement type (2D or 3D). Results study presented form methodological verification, performed basis comparison between actual rock shifts. Conclusions reliably predicts coal seam at one mines Moscow lignite basin.