Abstract
Abstract Deep soil mixing method (DSM) is a novel in situ technology in soil improvement in which different cementitious materials are mixed with soil and form a soil-cement column with improved engineering characteristics. Due to the configurations of these improved soil-cement columns, different types of DSM are formed, such as wall type, grid type, block type, etc. Due to the expansion in the construction of massive industrial structures, the use of block type DSM to control the settlements has grown. In order to use this soil improvement under the foundation of different structures, it is essential to study the seismic behavior of this mixture using site response analysis and wave propagation. In this paper, the seismic behavior of block type DSM is studied through fully nonlinear analyses. Nonlinear soil is modeled using the overlay method, which uses the parallel element modeling concept. Whereas, the DSM is modeled with elastic perfectly plastic behavior. It is observed that utilizing block type DSM has positive effects in seismic response of the soil layer, such as a considerable reduction in surface response acceleration.
Highlights
The deep soil mixing method (DSM) is an in situ soil improvement technology in which the soil is mixed with cementitious and other materials, these materials are called “binders” and they are in either slurry or dry forms
Input ground motions Two categories of input ground motion are used in the nonlinear analyses, which include artificial ground motion produced from bedrock spectrums and real time histories recorded on the hard rock sites
In the first part of the result section, the surface response acceleration time histories are studied to investigate the possible effects of soil treatment with block type DSM on acceleration of surface of soil domain
Summary
The deep soil mixing method (DSM) is an in situ soil improvement technology in which the soil is mixed with cementitious and other materials, these materials are called “binders” and they are in either slurry or dry forms. Kitazume and Terashi (2013) investigated the response of different types of deep soil mixings constructed in various parts of Japan to strong ground motions They reported that in the Tohoku earthquake (2011, Japan), no damages were found in the improved soil by the DSM and the superstructures, while in the parts without improvement, serious damages were identified. The nonlinear seismic behavior of the block type deep soil mixing (known as DSM pillow) is studied for a site with different layers and properties. In this type of improvement, a uniform improved soil block is formed by overlapping DSM columns. The effects of the DSM pillow with specific characteristics on the surface acceleration, surface response acceleration spectrum and shear stress-shear strain loops are studied
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