Mass Stabilization as a Ground Improvement Method for Soft Peaty

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Journal Title
Journal ISSN
Volume Title
A3 Kirjan tai muun kokoomateoksen osa
Date
2018-09-19
Major/Subject
Mcode
Degree programme
Language
en
Pages
Series
Peat
Abstract
Construction of road embankments or other infrastructures 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 the last 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 has proven to be a flexible ground improvement method for peat layers with maximum thickness of 8 m.
Description
Keywords
peat, soil properties, mass stabilization, deep mixing, Ground improvement, design, execution, long-term performance
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Citation
Forsman , J , Korkiala-Tanttu , L & Piispanen , P 2018 , Mass Stabilization as a Ground Improvement Method for Soft Peaty . in B Topcuoğlu (ed.) , Peat . vol. 1 , InTech Open , London , pp. 107-139 . https://doi.org/10.5772/intechopen.74144 , https://doi.org/10.5772/intechopen.69565