Deep Soil Mixing (DSM) Treatment of Expansive Soils


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by Raja Sekhar Madhyannapu, Former Doctoral Student; Civil Engineering, The University of Texas at Arlington, Arlington, Texas,
Anand J. Puppala, Professor; Civil Engineering, The University of Texas at Arlington, Arlington, Texas,
Venkat Bhadriraju, Former Graduate Research Assistant; Civil Engineering, The University of Texas at Arlington, Arlington, Texas,
Soheil Nazarian, Professor; Civil Engineering, The University of Texas at El Paso, El Paso, Texas,



Document Type: Proceeding Paper

Part of: Advances in Ground Improvement: Research to Practice in the United States and China

Abstract: The effectiveness of Deep Soil Mixing (DSM) treatment method was evaluated in terms of reducing heave movements of expansive subsoils underlying pavements and earth structures. Laboratory mix design study results were used to select a combined binder treatment approach utilizing lime and cement binders. DSM columns were designed and constructed in two pilot scale test sections. Surcharge equivalent to loads from base and surface layers was placed on top of these DSM treated sections through a fill placement. The two pilot test sections along with control sections on untreated soils were instrumented and monitored for period of two years. Monitored results showed that soil shrink-swell related movements in both vertical and lateral directions were lesser than those recorded in the untreated soil sections. Overall, this research showed the potential of DSM treatment method to minimize shrink-swell related movements from expansive subsoils of moderate depths.

Subject Headings: Soil treatment | Soil mixing | Expansive soils | Binders (material) | Subsoils | Columns | Base course | Laboratory tests |

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