The article presents the analysis results of influence of shape and dimensions of cross-section, laying depth of mine, cross-section shape and dimensions of underground mine on the daylight surface settlement of undermined territory depending on the different numerical values of the soil lateral pressure coefficient of the surrounding soil. The numerical solution was obtained in an elastic setting using the computer programs «FEA» and «Stability». In the calculations, the elastic modulus of the enclosing rocks is taken equal to the dimensionless constant E /γ H = 500 (where γ; H are the rocks volumetric weight and laying depth of mine), therefore, the numerical values of the vertical displacements gained as a result of the calculations are also dimensionless. This approach is convenient for both quantitative and qualitative analysis, because not only specific values of vertical displacements are considered, but also change patterns of their values depending on changes in the numerical values of the variables of the calculated parameters. Assuming that the displacements in the linear formulation of the problem are inversely proportional to the elastic modulus, their magnitudes can be determined for any other value of E . It was established the vertical displacements of earth’s surface points located above the mine, provided that the depth of its laying is more than 15.2 m and the dimensions of the cross section are greater than 4×4 m, significantly depend on the shape of the cross section and the lateral pressure coefficient of the surrounding rock. In addition, smaller vertical precipitation of the daylight surface corresponds to an underground mine having an exotic and «non-technological» cross section in the deltoid form. Therefore, the problem arises is to obtain such an optimal cross-sectional shape of the mine that would ensure the minimum precipitation of the earth's surface. The cross-sectional shape of the mine must be as “technological" as possible according to its advancement. The subject of further research is the solution of these problems.

The results of calculating the stability of a landslide-prone slope located on the river bank are presented. Additional stability studies were carried out due to the fact that, according to the results of slope calculations using various “compartments” methods, based on the construction of circular cylindrical sliding surfaces, the slope is in a stable state (tables are given containing the numerical values of the safety factors). However, in the spring-autumn period, local landslides occur on the slope. Therefore, new calculations of slope stability were carried out using a method based on the analysis of the stress state of the soil massif, which allows one to take into account the "weighing" effect of groundwater when it rises and the decrease in the strength properties of the constituent soils when they are soaked. This method is formalized in a computer program developed with the participation of one of the authors; the program has a certificate of state registration. Calculations have established that an increase in the level of groundwater to the maximum possible value reduces the values of the safety factors along the considered sliding lines by 5.9-21 %. It is shown that if the numerical values of the safety factors obtained by the methods of circular cylindrical sliding surfaces are reduced by 21 %, then some of their values will be very close to unity or even less, which resolves the above contradiction. When calculating the stability of landslide-prone soil masses, in which seasonal fluctuations of groundwater are possible, one should take into account the "weighing" effect of groundwater at the maximum level of their rise, a decrease in the physical and mechanical (strength) characteristics of soils due to their soaking and, preferably, the destabilizing effect of hydraulic heads.

Богомолов А.Н., Богомолова О.А., Степанова Е.А., Ушаков А.Н. Влияние формы и размеров поперечного сечения подземной выработки на величину осадки дневной поверхности // Вестник Пермского национального исследовательского политехнического университета. Строительство и архитектура. -2017- . -Т. 8, № 2. -С. 123-134. DOI: 10.15593/2224- -9826/2017 Приведены результаты анализа влияния на осадки дневной поверхности формы поперечного сечения, глубины заложения и поперечных размеров подзем-ной выработки при разных численных значения коэффициента бокового давления вмещающего грунта. Рассмотрены особенности изменения величин вертикальных перемещений точек земной поверхности, расположенных на оси симметрии выра-ботки, для сечений выработок в форме квадрата, половины эллипса, окружности и дельтоиды в зависимости от их геометрических размеров, глубины заложения и величины коэффициента бокового давления вмещающего массива. Представлены графики изменения величины вертикального смещения точек земной поверхности, лежащей на оси симметрии выработок с сечением в виде квадрата, круга, половины эллипса и дельтоиды по мере увеличения глубины их заложения. Приведенные результаты сопоставлены с результатами работ других авторов. Установлено, что при достижении некоторых значений глубины заложения и размеров поперечного сечения выработки влияние указанных факторов становится существенным и воз-никает задача об оптимальной форме поперечного сечения выработки, обеспечи-вающей минимальные по величине осадки земной поверхности. © ПНИПУ Ключевые слова:подземная выработка, форма и размер поперечного сечения, осадки земной поверхности, ко-эффициент бокового давления вмещающего массива Богомолов Александр Николаевич -доктор технических наук, профессор,