EFFECTIVENESS OF MICRO-PILE INSTALLATION CONFIGURATION FOR INCREASING THE ULTIMATE SHALLOW FOUNDATION BEARING CAPACITY ON SOFT CLAY SOIL

Isnaniati*, Indrasurya B. Mochtar, Noor Endah Mochtar

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Soft clay soil is known for low bearing capacity and is prone to soil collapse under shallow foundations through Local Shear Failure. An approach to enhance the load-bearing capacity of such soil is by adopting micro-piles as reinforcement. This study aims to determine the effectiveness of micro piles in strengthening shallow foundations on soft clay soil through laboratory-scale testing. The soft soil used comes from kaolin clay characterized by a cohesion (cu) of 20.692 kN/m2 and water content (we) of 58.631%. These properties guided the crafting of test specimens, formed with a diameter (ds) of 0.33m and a height (Hs) of 0.185m. Micro-piles were constructed from bamboo with varying numbers (n = 4, 9, 16, 25), lengths (L1= 1.33B, L2= 1.73B, L3= 2.13B), and diameters (d1= 0.03B, d2 = 0.04B, d3= 0.07B). The shallow foundation model with a square shape of BxB (where B=0.075 m), incorporated diverse configurations for the installation of micro-piles (K1, K2, K3). The results showed that more micro-piles (n) led to a higher bearing capacity ratio at a 0.1B reduction (Rqult-mp). The most significant enhancements occurred with the longest micro-piles (L3 = 2.13B), the highest number (n4 = 25), and a diameter of 0.04 B. Additionally, configurations including micro-piles installed beneath and extending up to the foundation’s edge (K1 and K2) exhibited significant enhancement in Rq0.1B for identical micro-piles numbers (n). The installation of micro-piles beyond the foundation perimeter did not yield substantial increases in Rq0.1B and, therefore, is not recommended.

Original languageEnglish
Pages (from-to)1-10
Number of pages10
JournalInternational Journal of GEOMATE
Volume26
Issue number117
DOIs
Publication statusPublished - 2024

Keywords

  • Laboratory-Scale Model
  • Local Shear Failure
  • Micro-Pile Reinforcement
  • Shallow Foundation
  • Soft Clay Soil

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