ABSTRACT:

Mass stabilization is a new, environmentally friendly soil improvement method where stabilizer is mixed into peat, mud or soft clay. Mass stabilization is carried out by a mixing tool, which has been installed on an excavator machine. Mixing is done both in horizontal and vertical directions so that a homogeneous reinforced soil block is formed due to effect of stabilizer. Embankments can be founded on mass stabilized soil in the same way as on natural firm soil layers like moraine or gravel. New stabilizer agents, produced as by-products from industrial processes, can be used as stabilizers instead of the traditionally used lime and lime-cement mixtures.

INTRODUCTION

Nowadays road and railway construction in Scandinavia is carried out more and more often on soil with low bearing capacity, especially on the coastal areas. Also most of the new housing areas are located near city centres, where it has earlier been almost impossible to construct due to economical and technical problems from the difficult soil conditions. The traditional solution in construction on the peat, mud or soft clay areas is to use soil replacement method. Excavated material is replaced by return transport by frictional materials or blasted rock, which have better bearing capacity properties. For instance approximately 1,000,000 m3 of soaked, poor quality surplus material is produced annually in the Helsinki metropolitan area. The corresponding quantity of unuseable soft soil must be replaced with natural gravel and blasted rock. Disposal of poor quality surplus material can be regarded as one of the most significant environmental problems in construction. A new method for soil improvement is the mass stabilization where the whole mass is strengthened to a homogeneous block structure, which behaves like dry crust. This method can be expanded to be applicable even to peat, which has not been previously exploited.

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