登录查看更多内容

Last updated on 2024年4月14日

How do you design and install soil-cement mixtures for liquefaction mitigation?

由人工智能和领英社区提供技术支持

Liquefaction is a phenomenon that occurs when soil loses its strength and stiffness due to earthquake-induced vibrations. It can cause severe damage to buildings, foundations, and infrastructure. One of the methods to mitigate liquefaction is to improve the soil by injecting cement grout or slurry into it, forming a soil-cement mixture. This article will explain how to design and install soil-cement mixtures for liquefaction mitigation in the context of geotechnics.

本文章的要点总结

Grout injection method:

This approach involves injecting cement grout into soil to form a solidified mixture that enhances ground stability. You can tailor it to your site's conditions for effective liquefaction mitigation.
Confinement grid patterns:

Establishing a grid of soil-cement mixtures increases resistance to shear stress and prevents lateral and vertical deformations during liquefaction, acting like a shield for surrounding untreated soil.

本摘要由 AI 和以下专家提供支持

Dr.-Ing. Mehran Naghizadeh

Projektleiter | Digitalisierung und BIM…
David Febres

Senior Commercial Manager en KELLER |…

1 What is soil-cement?

Soil-cement is a composite material that consists of soil particles bonded by cement. It can be produced by mixing soil and cement in situ or by placing pre-mixed soil-cement blocks or columns into the ground. Soil-cement can improve the strength, stiffness, and durability of soil, as well as reduce its permeability and compressibility. Soil-cement can also increase the resistance of soil to liquefaction by increasing its density and cohesion.

添加您的观点

Dr.-Ing. Mehran Naghizadeh

Projektleiter | Digitalisierung und BIM in Geotechnik @ ICG
举报内容
In geotechnical engineering, soil-cement is key for liquefaction mitigation. By mixing soil and cement in situ, we enhance soil properties, significantly reducing liquefaction risks during earthquakes. This approach offers a tailored, cost-efficient solution for stabilizing ground under critical infrastructure. Soil-cement's versatility allows for adjustments to meet specific site conditions, proving its value in creating resilient infrastructures. Its application demonstrates our commitment to innovative, sustainable engineering, merging natural materials with modern techniques for optimal resilience.

已翻译

赞

2 How to design soil-cement mixtures?

The design of soil-cement mixtures is influenced by several factors, such as the type and properties of soil, the desired performance and function of soil-cement, the availability and cost of materials, and the environmental and technical constraints. It's important to consider the cement content and water-cement ratio, as these determine the strength and workability of soil-cement. Generally, higher cement content and lower water-cement ratio result in higher strength and lower workability. The gradation and compaction of soil also affect the density and porosity of soil-cement. Generally, well-graded and compacted soil-cement has higher density and lower porosity. Additionally, curing conditions and time influence the hydration and hardening of cement. Generally, moist and warm conditions with a longer curing time will enhance the development of strength and durability of soil-cement.

添加您的观点

Dr.-Ing. Mehran Naghizadeh

Projektleiter | Digitalisierung und BIM in Geotechnik @ ICG
举报内容
Designing soil-cement mixtures requires a nuanced understanding of soil properties, material costs, and project-specific requirements. In my work, balancing cement content and water-cement ratio has been crucial. High cement content improves strength but can impact workability and costs. We aim for a balance that ensures durability without compromising the project budget. Soil type greatly influences our approach. For instance, sandy soils with good gradation require less cement than clayey soils, which are more challenging to stabilize. The key is to achieve a well-graded mixture that compacts efficiently, enhancing the density and reducing porosity, thereby improving the strength and durability of the final product.

已翻译

赞

3 How to install soil-cement mixtures?

The installation of soil-cement mixtures can be done by various methods, depending on the site conditions and the design specifications. Jet grouting is a method that involves injecting high-pressure jets of cement grout into the soil, creating cylindrical columns or panels of soil-cement. Deep mixing is another approach that involves mixing the soil and cement slurry with a rotating auger or paddle, creating vertical or horizontal columns or walls of soil-cement. Compaction grouting is a third option that involves injecting low-pressure pulses of cement grout into the soil, creating spherical or ellipsoidal bulbs of soil-cement. Each method has its own advantages and can be used to treat different types of soils and create different shapes and sizes of soil-cement elements.

添加您的观点

Dr.-Ing. Mehran Naghizadeh

Projektleiter | Digitalisierung und BIM in Geotechnik @ ICG
举报内容
Selecting the right soil-cement installation method is crucial in geotechnical engineering, based on site conditions and project needs. Jet grouting offers precision in creating soil-cement columns for structural support, ideal in dense urban settings. Deep mixing, with its ability to mix soil and cement slurry directly, is suited for extensive soil stabilization, improving ground conditions effectively. Compaction grouting, injecting cement grout at low pressure, targets specific weaknesses, enhancing ground stability with minimal disruption. Each technique—jet grouting, deep mixing, and compaction grouting—has distinct advantages, from precision to scale of application.

已翻译

赞
David Febres

Senior Commercial Manager en KELLER | Máster en Geotecnia. Apasionado de la Geotecnia y las Ventas.
举报内容
Existen principalmente dos sistemas para realizar este tipo de técnicas, por Jet Grouting o por Mezcla Mecanica: existen diferencias sustanciales entre el Jet Grouting y la mezcla profunda de suelos. Conceptualmente la diferencia mas grande seria la generación de detritus producto de una sustitución del suelo por lechada de cemento que ocurre en el Jet y no en las mezclas de suelo. Mientras que el Jet Grouting implica la sustitución parcial del suelo por lechada de cemento debido a la rotura del mismo, altas presiones y caudales de inyección así como la salida de detritos, la mezcla profunda de suelos es un proceso mecánico que une el suelo con el cemento directamente en su lugar, con mínimos cambios en el volumen del suelo.

已翻译

赞

4 What are the benefits of soil-cement mixtures?

Soil-cement mixtures are a great way to reduce the risk of liquefaction. They increase the shear strength and stiffness of soil, reducing its susceptibility to liquefaction. Additionally, they reduce the pore water pressure and excess pore water pressure generation during earthquakes, preventing the loss of effective stress and bearing capacity of soil. Furthermore, soil-cement mixtures enhance the drainage and consolidation of soil, reducing its settlement and deformation after earthquakes. Lastly, they provide structural support and reinforcement to foundations and infrastructure, improving their stability and performance.

添加您的观点

Dr.-Ing. Mehran Naghizadeh

Projektleiter | Digitalisierung und BIM in Geotechnik @ ICG
举报内容
Soil-cement mixtures are invaluable in geotechnical engineering, offering enhanced ground stability and seismic risk mitigation. Their key benefits include increased shear strength and stiffness, reduced susceptibility to liquefaction, and improved soil drainage and consolidation. This translates to better foundational stability and structural support for infrastructure, particularly in earthquake-prone areas. Our practical experience underscores soil-cement's role in safeguarding structures against earthquakes, highlighting its significance in innovative and sustainable construction practices.

已翻译

赞
David Febres

Senior Commercial Manager en KELLER | Máster en Geotecnia. Apasionado de la Geotecnia y las Ventas.
举报内容
Uno de los principales beneficios seria la mitigación del potencial de licuación con acciones sísmicas importantes, dado que los otros sistemas de mitigación de licuación. Seguramente con aceleraciones sísmicas superiores a 0.7 g, sea la única opción viable que se puede demostrar matematicamente.

已翻译

赞

5 What are the challenges of soil-cement mixtures?

Soil-cement mixtures have some challenges for liquefaction mitigation which require careful quality control and assurance during design and installation. The accuracy and uniformity of material properties and placement methods must be taken into consideration. Additionally, there may be environmental impacts, such as groundwater contamination, carbon emissions, and waste generation, which need to be assessed and mitigated. Furthermore, compatibility issues with the surrounding soil and structures, such as differential settlement, shrinkage cracking, and corrosion should be monitored and repaired.

添加您的观点

Dr.-Ing. Mehran Naghizadeh

Projektleiter | Digitalisierung und BIM in Geotechnik @ ICG
举报内容
Implementing soil-cement mixtures for ground stabilization and liquefaction mitigation involves overcoming challenges such as ensuring uniform material properties, addressing environmental impacts like groundwater contamination and carbon emissions, and managing compatibility with surrounding soil and structures. Rigorous quality control, sustainable practices, and comprehensive compatibility assessments are essential for mitigating issues like differential settlement, shrinkage cracking, and corrosion. Balancing these technical and environmental considerations is crucial for the successful application of soil-cement mixtures in geotechnical engineering projects.

已翻译

赞

6 Here’s what else to consider

This is a space to share examples, stories, or insights that don’t fit into any of the previous sections. What else would you like to add?

添加您的观点

David Febres

Senior Commercial Manager en KELLER | Máster en Geotecnia. Apasionado de la Geotecnia y las Ventas.
举报内容
Es importante mencionar que siempre que los sistemas de mejoramiento de suelos por medio de mezcla de suelos se usen para mitigar licuación, las configuraciones deben ser en retículas de confinamiento, lo que genera el efecto buscado: 1- La reducción de las tensiones de Cortante impuestas. 2- Proporcionando resistencia contra deformaciones laterales o asentamientos verticales incluso si se desencadena la licuefacción. 3- Proporcionar una barrera contra el exceso de presión de poros que migra desde los suelos circundantes no mejorados a los suelos circundante.

已翻译

赞

Geotechnics

+ 关注

给文章评分

我们借助人工智能创建了此文章。您认为这篇文章怎么样？

很棒不太好

举报此文章

查看全部

How do you design and install soil-cement mixtures for liquefaction mitigation?

1

2

3

4

5

6

1 What is soil-cement?

2 How to design soil-cement mixtures?

3 How to install soil-cement mixtures?

4 What are the benefits of soil-cement mixtures?

5 What are the challenges of soil-cement mixtures?

6 Here’s what else to consider

Geotechnics

给文章评分

感谢您的反馈

更多Geotechnics相关文章

更多相关阅读内容