STRESS-STRAIN CONDITION AROUND A CYLINDER EXPANDING IN THE SOIL

Abstract

The problem of expansion of an underground cylindrical cavity emerges in a number of geotechnical problems for example when the bearing capacity and load-settlement diagram of deep foundations determined, pressuremeter tests are interpreted, or the tension-strain diagram of grouted soil anchors is caiculated and so on. This paper presents a new method to calculate stress/displacement conditions around an expanding cylinder, and the pulling resistance of an axiaily loaded cylinder after its expansion. The cylindrical expansion in the soil examined as a process, to respect the interaction of the surrounding soil mass, determinated the change in soil density. The paper shows example of calculation and simple diagrams to determine the radius of the compaction zone and the distribution of stresses, and volume changes in the soil.