Mass Stabilization as a Ground Improvement Method for Soft Peaty

Juha Forsman, Leena Korkiala-Tanttu, Pyry Piispanen

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Abstract

Construction of road embankments or other infra structures on soft peat is a challenge. The main problems are high compressibility and rather low undrained shear strength of peat. Mass stabilization provides a solution to improve the properties of a peaty subgrade. Mass stabilization is a ground improvement method, where hardened soil mass is created by adding binder into soil and by controlled in-situ mixing. Mass stabilization poses an alternative solution for conventional mass replacement or other techniques, which leave peat in place. The chapter deals with mass stabilization of soft peat soil. Specific attention is paid to design, research and construction considerations, and experience obtained during last three decades. Peat properties before and after stabilization, design methods including pre-testing, stabilization technique and machinery, quality control methods and practices, binder technology, long-term performance of mass stabilized peat, environmental effects, feasibility, applications and limitations are all presented and discussed in this chapter. The long-term observations (during 25 years) have shown that the strength of stabilized peat has continued to increase in average 1.6 times from the strength of 30 days. Therefore mass stabilization have proven to be a flexible ground improvement method for peat layers with maximum thickness of eight meters.
Original languageEnglish
Title of host publicationPeat
EditorsBülent Topcuoğlu
Place of PublicationLondon
PublisherInTech Open
Chapter7
Number of pages34
ISBN (Electronic)978-1-78923-747-4
ISBN (Print)978-1-78923-746-7
DOIs
Publication statusPublished - 19 Sep 2018
MoE publication typeA3 Part of a book or another research book

Keywords

  • peat
  • soil properties
  • mass stabilization
  • deep mixing
  • Ground improvement
  • design
  • execution
  • long-term performance

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  • Cite this

    Forsman, J., Korkiala-Tanttu, L., & Piispanen, P. (2018). Mass Stabilization as a Ground Improvement Method for Soft Peaty. In B. Topcuoğlu (Ed.), Peat London: InTech Open . https://doi.org/10.5772/intechopen.74144