Settlement of Soil Reinforced with Vertical Fiberglass Micro-Piles

Abstract

This article is dedicated to investigating the properties of soil after its reinforcement with fiberglass elements through large-scale laboratory plate-load tests of various samples that varied in the numbers and lengths of the reinforcing elements. The investigation of the vertical elements considered the diameter increase at the bottom toe by using widening washers. The results were compared relative to each other and to the theoretical calculation results. The theoretical calculations for the settlements were undertaken based on the authors’ proposed method. The method considers the number, shape, area and material of the strengthening elements using a pre-proposed reinforcement area factor µ. This pre-established factor was calculated with reference to the elements’ geometry—the diameter of the vertical elements and the bottom’s washer diameter—which determined the reinforcement area. A comparison between the reinforced and reference soft sandy soil samples indicated a 25% increase in the deformation modulus after the reinforcement process at a pressure of 25 kPa. Samples with µ ranging from 1.20 to 1.43 were 55–65% stiffer than samples with µ equal to 0.69 at a pressure of 100 kPa. The comparative analysis of the calculated results and the actual laboratory PLT test results was adequate for use for further development.

Effect of Solidified Depth on the Vertical Compressive Bearing Characteristics of the Soil Continuously Solidified Pile Group Foundation

“…This improves the physical and mechanical properties of soil at the tip and around the pile, thus enlarging the bearing capacity of the pile foundation [21,22]. In the process of grouting, piles and soil between piles form a composite foundation [23] and produce an extrusion effect [24,25], the physical and mechanical properties of the composite foundation inter-pile soil have been greatly improved [26,27]. In addition, new techniques, such as biological grouting, have been increasingly applied to improve the strength of soil between piles [28].…”

Constructive solutions to ensure the safety of the object of historical heritage in conditions of weak foundation soils

“…When operating such facilities, it is advisable to monitor the current state of the facility, the soil foundation, and perform dynamic forecasts of reliable joint operation of the "foundationfoundation" system when the initial conditions of their operation change. Only a comprehensive solution to these problems makes it possible to ensure reliable and safe operation of buildings and structures, especially objects of historical heritage [18][19][20][21][22].…”