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Questions and Answers
Which method of improving soil involves increasing the shear strength of soil and decreasing expected settlement?
Which method of improving soil involves increasing the shear strength of soil and decreasing expected settlement?
- Dynamic compaction
- Mechanical compaction (correct)
- Preloading
- Vibroflotation
What is the general practice for building foundations when the soil close to the ground surface has sufficient bearing capacity?
What is the general practice for building foundations when the soil close to the ground surface has sufficient bearing capacity?
- Use shallow foundations (correct)
- Use deep foundations
- Use pile or pier foundations
- Use soil improvement techniques
Which method of improving soil involves applying a surcharge load to the ground surface for an extended period to improve its load-bearing capacity?
Which method of improving soil involves applying a surcharge load to the ground surface for an extended period to improve its load-bearing capacity?
- Use of admixtures
- Preloading (correct)
- Injection of suitable grouts
- Sand and stone columns
What method of soil improvement involves using high-energy compaction equipment to densify soil?
What method of soil improvement involves using high-energy compaction equipment to densify soil?
Which method of improving soil involves the use of columns made from sand or stone to reinforce and improve the soil?
Which method of improving soil involves the use of columns made from sand or stone to reinforce and improve the soil?
Which technique for improving soil involves injecting suitable grouts into the ground to strengthen it?
Which technique for improving soil involves injecting suitable grouts into the ground to strengthen it?
What is the primary focus of soil improvement techniques discussed in the passage?
What is the primary focus of soil improvement techniques discussed in the passage?
Which technique involves placing a surcharge fill on the top of the soil to induce large consolidation settlement before construction?
Which technique involves placing a surcharge fill on the top of the soil to induce large consolidation settlement before construction?
What is the main advantage of soil replacement compared to other techniques and deep foundation?
What is the main advantage of soil replacement compared to other techniques and deep foundation?
Which method focuses on increasing soil bearing capacity and/or decreasing expected soil settlement?
Which method focuses on increasing soil bearing capacity and/or decreasing expected soil settlement?
In what way does soil replacement improve the foundation condition?
In what way does soil replacement improve the foundation condition?
Which technique involves executing soil improvement without admixtures?
Which technique involves executing soil improvement without admixtures?
What can be used to replace poor soil under shallow foundations according to the passage?
What can be used to replace poor soil under shallow foundations according to the passage?
Which method is most effective in clayey soil due to its low permeability?
Which method is most effective in clayey soil due to its low permeability?
What is one of the main purposes of pre-compression or preloading technique?
What is one of the main purposes of pre-compression or preloading technique?
What is the purpose of using thermal methods such as heating or freezing for soil improvement?
What is the purpose of using thermal methods such as heating or freezing for soil improvement?
What is the primary factor needed to produce collapse in a soil structure?
What is the primary factor needed to produce collapse in a soil structure?
In which type of regions are collapsible soils commonly encountered?
In which type of regions are collapsible soils commonly encountered?
What is the collapse phenomenon primarily related to?
What is the collapse phenomenon primarily related to?
Which type of soil structure exhibits a large decrease in strength at moisture contents approaching saturation?
Which type of soil structure exhibits a large decrease in strength at moisture contents approaching saturation?
What is another name for collapsible soils?
What is another name for collapsible soils?
What does the sudden and usually large volume change of collapsible soils cause?
What does the sudden and usually large volume change of collapsible soils cause?
What are collapsible soils characterized by?
What are collapsible soils characterized by?
What is the main purpose of using preloading techniques on collapsible soils?
What is the main purpose of using preloading techniques on collapsible soils?
Which method involves the use of cementing agents such as Portland cement to improve the load-bearing capacity of collapsible soils?
Which method involves the use of cementing agents such as Portland cement to improve the load-bearing capacity of collapsible soils?
What is the primary focus of using thermal methods such as heating or freezing for soil improvement?
What is the primary focus of using thermal methods such as heating or freezing for soil improvement?
In what way does soil replacement improve the foundation condition?
In what way does soil replacement improve the foundation condition?
Which technique involves executing soil improvement without admixtures?
Which technique involves executing soil improvement without admixtures?
What method of improving soil involves applying a surcharge load to the ground surface for an extended period to improve its load-bearing capacity?
What method of improving soil involves applying a surcharge load to the ground surface for an extended period to improve its load-bearing capacity?
Which method involves increasing the shear strength of soil and decreasing expected settlement?
Which method involves increasing the shear strength of soil and decreasing expected settlement?
What is the general practice for building foundations when the soil close to the ground surface has sufficient bearing capacity?
What is the general practice for building foundations when the soil close to the ground surface has sufficient bearing capacity?
What method is most effective in clayey soil due to its low permeability?
What method is most effective in clayey soil due to its low permeability?
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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.
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