Interaction of Long Piles with a Multilayer Soil Mass, Taking into Account the Elastic and Rheological Properties

Abstract

When weak clay soils lie at the base, the settlement of the building can continue for a long period of time. In the design of foundations on such soils, the forecast of settlement over time is of great importance. The strength and stability of structures depends both on the rate of development of the settlement over time and on the final settlement of the structure. Therefore, the approach to describe the process of foundation settlement must be considered as rheological. This article discusses the statement and solution of the problem of the interaction of a long pile with the surrounding multilayer and underlying soils. The problem was considered in a linear setting, taking into account the rheological properties of the surrounding soil mass. The solution is presented by analytical method. It has been established that the rheological properties of a multilayer soil mass have a significant effect on the nature of the redistribution of forces on the pile between the lateral surface and the lower end. The dependence of the pressure change under the lower end of the pile on time is obtained. An expression is found for determining the reduced shear modulus for a multilayer soil mass. The solutions obtained can be used to preliminary determining of the movement of a long pile in time. The analytical solutions in the article are supported by the graphical part. The graphs of the dependence of the force on the pile heel on time are given for a variable load on the pile head and for a variable pile length. The selection of the optimal ratio of the pile length and its diameter allows the most effective usage of the bearing capacity of the pile.