The article describes new methods of calculation of soil bases reliability (probability of non-failure) according to the load-bearing capacity criterion at the operation stage. The reliability of soil bases is considered as an integral part for assessing the overall operational reliability of buildings and structures, as well as for making a decision on the possibility and feasibility of reconstruction with increasing load. The proposed method of reliability calculation can be used to assess the reliability of load-bearing elements of the overhaul with replacement of parts of the building. The algorithm of the method of reliability calculation is presented in the numerical example of reliability calculation. 

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The article describes the method of calculation of soil bases reliability with limited statistical information using controllable parameters of calculated model by the possibilistic method according to the non-admissibility criterion of general setting level change value taking using generalization principle of Zaden’s, L. fuzzy sets theory. Design formulas are given, and the algorithm of soil bases calculation reliability according to the deformation criterion is shown using an example.

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