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Ground Improvement

Deep Soil Mixing

Ground Improvement

Deep Soil Mixing (DSM)

Deep Soil Mixing (DSM) is a collective term that encompasses several different techniques used for soil improvement. Deep Mixing Method (DMM), Cement Deep Mixing (CDM), and Cement Deep Soil Mixing (CDSM) are all part of DSM. However, each of these methods employs slightly different techniques and is suited to different applications, depending on the specific requirements of the project. At Pacific Foundation, we utilize a wide variety of methods to provide both strength improvement and containment for a broad range of projects including retaining/cutoff walls, watertight bottom seals, foundation support and liquefaction mitigation, as examples. 

Deep Mixing Method (DMM)

Deep Mixing Method or DMM involves a mechanical process that mixes the in-situ soil with a binder material, usually a form of cement, lime, or a combination of both. The binder is injected into the soil as the mixing blades rotate, which creates columns of stabilized soil. These soil-cement columns can be arranged in a pattern to form a soil-cement wall or can stand alone as individual elements to support a structure. The primary use of DMM is to improve the load-bearing capacity of soft or loose soils and reduce settlement.

Cement Deep Mixing (CDM)

Cement Deep Mixing or CDM is a method similar to DMM but has its roots in Japan. CDM typically uses a wet method where the binder, a cement slurry, is mixed with the soil using a specialized drill. The cement slurry and the soil are mixed in-situ to form a soil-cement mixture that improves the mechanical properties of the soil. CDM is often used to address issues with seismic stability, as the method helps increase the resistance to liquefaction, a phenomenon where saturated soil loses its strength due to an earthquake.

Cement Deep Soil Mixing (CDSM)

Cement Deep Soil Mixing or CDSM is a slightly more specific term, often used interchangeably with CDM. However, it typically refers to a method where the cement slurry is injected into the soil at high pressure. The high-pressure injection helps in better mixing and dispersion of the cement slurry in the soil, leading to a more homogenous and stronger soil-cement matrix. This method is particularly beneficial in scenarios where the soil has a high clay or silt content, as these types of soil can be challenging to mix with drier methods.

In summary, while DMM, CDM, and CDSM are all DSM techniques aimed at soil stabilization, they differ in their methods of binder injection, mixing techniques, and their applications. The choice between these methods depends on the soil type, environmental conditions, and the specific needs of the construction project. However, the main goal remains the same for all: to improve the properties of the soil, making it safer and more suitable for construction.

Advantages of Deep Cement Mixing

  1. Environmentally Friendly: DCM restricts the disturbance of the existing ground, minimizing soil displacement and reducing the overall environmental impact. It’s an excellent alternative for projects that prioritize green construction practices.
  2. High Performance: The DCM technique strengthens the soil substantially, enhancing its bearing capacity and resistance to liquefaction and lateral spreading. This leads to improved seismic performance of the structures.
  3. Cost and Time Effective: By mitigating the need for deep excavation or pile driving, DCM can significantly reduce construction time and costs associated with material disposal and ground improvement.
  4. Versatility: DCM is suitable for a broad range of soil types and can be utilized in various construction applications, such as building foundations, embankments, retaining walls, and more.

At Pacific Foundation, we have invested significant time and effort in developing innovative deep cement mixing solutions. Leveraging our rich experience and talented team of engineers, equipment operators and laborers, we ensure the technique’s optimal application, considering soil conditions, mix proportions, and design requirements.

Our DCM equipment consists of Bauer Equipment drill rigs and tooling that can efficiently drill to required depths and inject cement slurry at precisely controlled pressures. We ensure safety and quality control through real-time monitoring, capturing data on crucial parameters such as penetration rate, cement volume, and mixing energy.

Successful DCM Projects

We have executed numerous successful projects using DCM. From large-scale infrastructure projects to localized foundation treatments, Pacific Foundation has consistently delivered optimal results, demonstrating the immense potential and versatility of the DCM method.

Contact Us

For more information on our Deep Cement Mixing solutions or to discuss how we can assist with your next project, contact our team at Pacific Foundation. We’re excited to bring our expertise to your geotechnical challenges.

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