Abstract
The decreasing number of places suitable for constructing buildings forces people to creatively develop newer methods of soil reinforcement. One of these methods is the deep soil mixing. This technology has been firstly developed and applied in Japan in the 1970s. Initially, it was used to create DSM (Deep Soil Mixing) columns. In the subsequent years, it was also developed in Scandinavia. Over time, the deep mixing technology was modified and developed, and in addition to the wet method, also the dry method was started to be used, while in addition to the cement binder, also lime binders and fly ashes were used. Technologies consisting of the deep mixing of cement with soil are very popular due to the wide range of applications and relatively low implementation costs. The method of Mass Stabilization (MS) is a soil reinforcement method that is analogical to DSM and it consists of mixing large volumes of soil with cement. This article describes the method of dry Mass Stabilization of organic soils. It cites the analyzed laboratory tests of soil-cement material manufactured in MS technology. The tests included the creation of 140 material samples, and subsequently the performance of compression strength test on them, along with the registration of stress path. The main aspect of these tests consisted of increase in the primary deformation modulus over time, depending on the amount of applied cement. Also, an example of the project to strengthen the layer of aggregate mud under the floor in the hall is demonstrated. The reinforcement was implemented in the MS technology.
Highlights
The decreasing number of places suitable for constructing buildings forces people to creatively develop newer methods of soil reinforcement
The increasing human population results in the growing density of buildings, in the cities. This is associated with the construction of buildings on low-bearing or even organic soils. This is possible due to the use of many types of soil reinforcements, while the simplest of them is the replacement of soil, consisting of the removal of non-bearing soil and replacing it with a load-bearing soil, with freely selected parameters, which are determined by the designer
Development of the deep soil mixing methods is described in the work [3], which includes the presentation of the current state and progress noted mainly in the European context, while references to the application of this technology in Poland can be found in the works [4, 5]
Summary
The increasing human population results in the growing density of buildings, in the cities. This paper presents the method of dry mass stabilization in organic soils, such as peats This method is described in the book "Peat" [9], as well as in the paper [10], where the use of a mixture of cement with blast furnace slag was considered as a binder. They differ significantly in terms of the state of binder introduced into the soil, dry stabilisation - dry cement, lime or ashes, wet stabilisation - cement slurry, cement-lime slurry, etc., and in terms of the achieved product strength. As well as higher natural moisture content occurs in organic soils, MS is recommended for the reinforcement of organic soils
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