Yu. S. Mirenburg

Determination of Strength Characteristics of a Frozen Foundation Bed while Interacting with Piles from Results of Static Tests

A procedure is examined for determination of strength characteristics of frozen soils of a foundation bed while interacting with piles directly from results of static tests (and not from the Construction Rules and Regulations); this will permit significant improvement in the validity of these characteristics.

Improved methods of testing piles in frozen soils

Conclusions1. The approach adopted in this article for analysis of pile test data based on the above relations made it possible to work out three accelerated testing methods — stepped with equal-duration steps; dynamometric; and stepped-dynamometric.2. The results of the performed tests are characterized by an increased information content, which makes it possible to design the piles for two groups of limit states and to take into account the pile load variation.3. The reliability of the proposed testing and design methods is confirmed by comparison with experimental data.

Determination of Rheologic Characteristics of Frozen Soils and Beds by Relaxation Tests

Various methods of evaluating the rheologic properties of frozen soils are examined. Theoretical basis is given for relaxation methods of testing, means of processing experimental data, and analysis of test results.

Effect of Load and Temperature Variability on the Bearing Capacity of Frozen Beds

A procedure is presented for determination of working-condition factors during temperature variations and variable loads for their inclusion in the Construction Rules and Regulations, and use during analysis of frozen beds.

Discussion of SNiP 2.02.04-88 Norm "bases and foundations on permafrost soils"

From the Editors: The complexity of construction on permafrost soils, as well as numerous cases of deformation of structures constructed on such soils, calls for an especially careful design and construction approach. The preparation of all editions of the SNiP Norms for design of bases and foundations on permafrost soils (including the last edition 2.02.04-88 of the SNiP Norms), has always been carried out with the participation of many different organizations, and their discussion is of a wide nature. However, after edition of the latest SNiP Norms and their approbation in the engineering practice, continuation of this discussion is highly desirable.For this reason, on publishing the present article without any evaluation of the recommendations contained in it, the Editors ask the specialists in the field of foundation construction on permafrost soils to express their opinions about the questions considered in the article as well as about other criteria of the SNiP 2.02.04-88 Norms.

Stock test sounding pile

A new design is suggested for a stock sounding pile that makes it possible to separately determine the bearing capacity and deformation characteristics of layers of engineering-geological elements (EGE) on the side surface and tip of the test pile. From these data, any piles sunk into a base with different thicknesses of the EGE can be calculated.