32 Questions
Which method of improving soil involves increasing the shear strength of soil and decreasing expected settlement?
Mechanical compaction
What is the general practice for building foundations when the soil close to the ground surface has sufficient bearing capacity?
Use shallow foundations
Which method of improving soil involves applying a surcharge load to the ground surface for an extended period to improve its load-bearing capacity?
Preloading
What method of soil improvement involves using high-energy compaction equipment to densify soil?
Dynamic compaction
Which method of improving soil involves the use of columns made from sand or stone to reinforce and improve the soil?
Sand and stone columns
Which technique for improving soil involves injecting suitable grouts into the ground to strengthen it?
Injection of suitable grouts
What is the primary focus of soil improvement techniques discussed in the passage?
Improving soil stability and minimizing construction costs
Which technique involves placing a surcharge fill on the top of the soil to induce large consolidation settlement before construction?
Pre-compression or preloading
What is the main advantage of soil replacement compared to other techniques and deep foundation?
It is more economical and requires less delay to construction
Which method focuses on increasing soil bearing capacity and/or decreasing expected soil settlement?
Chemical stabilization
In what way does soil replacement improve the foundation condition?
By reducing consolidation settlement and increasing soil bearing capacity
Which technique involves executing soil improvement without admixtures?
Pre-compression or preloading
What can be used to replace poor soil under shallow foundations according to the passage?
Gravel or crushed stone
Which method is most effective in clayey soil due to its low permeability?
Pre-compression or preloading
What is one of the main purposes of pre-compression or preloading technique?
To induce large consolidation settlement before construction
What is the purpose of using thermal methods such as heating or freezing for soil improvement?
To reduce expected soil settlement
What is the primary factor needed to produce collapse in a soil structure?
Stabilizing cementing agent
In which type of regions are collapsible soils commonly encountered?
Arid and semi-arid regions
What is the collapse phenomenon primarily related to?
The soil's moisture content
Which type of soil structure exhibits a large decrease in strength at moisture contents approaching saturation?
Collapsible soil
What is another name for collapsible soils?
Metastable soils
What does the sudden and usually large volume change of collapsible soils cause?
Considerable structural damage
What are collapsible soils characterized by?
Low dry densities and low bearing capacity when wet
What is the main purpose of using preloading techniques on collapsible soils?
To decrease the expected soil settlement
Which method involves the use of cementing agents such as Portland cement to improve the load-bearing capacity of collapsible soils?
Chemical stabilization
What is the primary focus of using thermal methods such as heating or freezing for soil improvement?
Decreasing expected soil settlement
In what way does soil replacement improve the foundation condition?
By replacing poor soil under shallow foundations
Which technique involves executing soil improvement without admixtures?
Preloading technique
What method of improving soil involves applying a surcharge load to the ground surface for an extended period to improve its load-bearing capacity?
Preloading technique
Which method involves increasing the shear strength of soil and decreasing expected settlement?
Chemical stabilization
What is the general practice for building foundations when the soil close to the ground surface has sufficient bearing capacity?
Strip foundations are commonly used
What method is most effective in clayey soil due to its low permeability?
Chemical stabilization
Study Notes
Soil Improvement Techniques
- Increasing the shear strength of soil and decreasing expected settlement is a method of improving soil.
- Applying a surcharge load to the ground surface for an extended period to improve its load-bearing capacity is a method of soil improvement.
- Using high-energy compaction equipment to densify soil is a method of soil improvement.
- Using columns made from sand or stone to reinforce and improve the soil is a method of soil improvement.
- Injecting suitable grouts into the ground to strengthen it is a technique for improving soil.
Soil Replacement
- Soil replacement improves the foundation condition by increasing its bearing capacity and/or decreasing expected settlement.
- It is an effective method compared to other techniques and deep foundation.
- It can be used to replace poor soil under shallow foundations.
Pre-compression or Preloading Technique
- This technique involves placing a surcharge fill on the top of the soil to induce large consolidation settlement before construction.
- One of the main purposes of pre-compression or preloading technique is to reduce settlement and increase the bearing capacity of the soil.
Collapsible Soils
- Soil replacement is an effective method for collapsible soils.
- Thermal methods such as heating or freezing are used to improve collapsible soils.
- The primary factor needed to produce collapse in a soil structure is the presence of air-filled voids.
- Collapsible soils are commonly encountered in arid and semi-arid regions.
- The collapse phenomenon is primarily related to the sudden and usually large volume change of collapsible soils.
- Collapsible soils are characterized by a large decrease in strength at moisture contents approaching saturation.
- Another name for collapsible soils is metastable soils.
- The sudden and usually large volume change of collapsible soils causes settlement and structural damage.
- The main purpose of using preloading techniques on collapsible soils is to reduce settlement and increase the bearing capacity of the soil.
Other Methods
- Using cementing agents such as Portland cement to improve the load-bearing capacity of collapsible soils is a method of soil improvement.
- The primary focus of using thermal methods such as heating or freezing for soil improvement is to increase the bearing capacity of the soil.
Test your knowledge on soil improvement techniques with this quiz. Explore the concepts of shallow foundations, pile and pier foundations, and methods for transferring loads to deeper firm strata.
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