Abstract
Present research papers focuses to strength low plastic soil using deep cement mixing technique through model study. Soil column length of 10cm, 20 cm and 30cm was used with varying degree of saturation as 60%, 80% and 100% of OMC to determine settlement characteristics, unconfined compressive strength, modulus of subgrade reaction and modulus of elasticity of raw and treated soil. Cement dosage for UCS test and model plate load test was decided as per guidelines provided in FHWA 13-046 design manual and CDM-LODIC method respectively. Method of deep mixing the soil with cement was adopted from theory given by Filz et.al. (2005). The results depicted the cement deep mixing methodology based on soil particle-cement particle interaction with varying degree of saturation proved the efficacy for low plastic soils and maximum reduction in settlement was observed for 60% degree of saturation for column length of 20 cm. Modulus of elasticity was validated with provisions of FHWA whereas load carrying capacity of soil-cement column was validated with Broms empirical equation.
Highlights
Deep Soil Mixing technique was developed in 1970’s in Japan and is extensively used in countries like USA, France, etc
Deep soil mixing can be characterized into 23 different techniques like Cement Deep Mixing (CDM), Wet Deep Mixing Method (WDMM), Dry Deep Mixing Method (DDMM), etc
There is a difference between pressure grouting or jet grouting and wet deep mixing technique, in the former the binder is injected into the soil under a certain pressure head whereas in the latter the soil is filled under a certain static head and mixed under a particular rotational head depending on the degree of mixing as well as strength required as shown by Filz. [1]
Summary
Deep Soil Mixing technique was developed in 1970’s in Japan and is extensively used in countries like USA, France, etc. The present research emphasizes on studying the effectiveness of cement deep mixing (CDM) technique on soil compacted at different degrees of saturation. In the present study soil was compacted at 90% of maximum dry density and at varying degree of saturation as 60%, 80% and 100% of optimum moisture content, the soil-cement column length were varied as 10cm, 20cm and 30cm and its unconfined compression strength as well as settlement facet were studied. Topolnicki [5] classified the Deep Soil Mixing (DSM) technique in three levels taking into consideration dry and wet deep mixing method. These are mainly: (1) Mechanical, hydraulic or hybrid way of mixing; (2) position of mixing; (3) axis of rotation of the tool. Commencement of the above four steps leads to the formation of a rigid soil-cement column which improvises the soil to a very great extent
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