Analysis of the Pile Foundation Calculation Results Given the Action of an Earthquake and Soaking of the Loess Base

Abstract

Purpose and task: On the territory of Mongolia, loess type subsiding soils are widespread and where seismic activity is 6–9 points according to the modified scale of Giuseppe Mercalli (Charles Richter) system. During the calculation of piles, the goal was to analyze the reduction in the bearing capacity of the pile foundation, depending on the activity of the earthquake and the water saturation of the soil of the building base in the operational stage. Brief description of the methodology: Based on the results of the analytical calculation, a comparative analysis of the reasons for the decrease in the bearing capacity of the pile foundation under action 6 was carried out; 7; 8 and 9 points and in the condition Wsat. A method was used to predict the probability of a risk from unacceptable and uneven settlement of buildings and structures. Results and conclusions: A quantitative assessment of the reduction in the bearing capacity of the pile foundation was obtained and the inequalities of the boundary conditions were revealed based on the results of comparative analyzes of numerical values, relevant factors of influence, such as an earthquake and wetting of the subsiding soil of the base. Conclusions are drawn on the basis of a quantitative assessment and comparative analyzes that when designing pile foundations in a mandatory laying, consider the problem of reducing and increasing uneven settlements, and make a design decision taking into account the coefficient of reduction in the bearing capacity of the foundation.