Podcast
Questions and Answers
The method of ______
has been used for thousands of years to provide tensile reinforcement to clayey materials in buildings, representing an early form of ground modification.
The method of ______
has been used for thousands of years to provide tensile reinforcement to clayey materials in buildings, representing an early form of ground modification.
wattle and daub
The process of adding straw to clay and ______
improved the strength properties of the clay, leading to a durable building material that has been used for centuries.
The process of adding straw to clay and ______
improved the strength properties of the clay, leading to a durable building material that has been used for centuries.
baking it in the sun
According to Moseley and Kirsch, all ground improvement techniques enhance soil characteristics to align with project goals, like boosting density and ______
for enhanced stability.
According to Moseley and Kirsch, all ground improvement techniques enhance soil characteristics to align with project goals, like boosting density and ______
for enhanced stability.
shear strength
As noted by Schaefer et al., ground improvement aims to alter foundation conditions or earth structures to achieve better performance under specified design and ______
conditions.
As noted by Schaefer et al., ground improvement aims to alter foundation conditions or earth structures to achieve better performance under specified design and ______
conditions.
Compaction is a first-order improvement that directly increases the ______
of soil, enhancing its stability.
Compaction is a first-order improvement that directly increases the ______
of soil, enhancing its stability.
An increase in soil density due to compaction leads to second-order effects such as increased strength and reduced ______
, improving the soil's load-bearing capabilities.
An increase in soil density due to compaction leads to second-order effects such as increased strength and reduced ______
, improving the soil's load-bearing capabilities.
Improvements in soil leading to increased bearing capacity and reduced settlement represent ______
order effects, further enhancing structural stability.
Improvements in soil leading to increased bearing capacity and reduced settlement represent ______
order effects, further enhancing structural stability.
Instead of ground improvement, an alternative is to consider ______
or a different area within the same site, leveraging more suitable ground conditions.
Instead of ground improvement, an alternative is to consider ______
or a different area within the same site, leveraging more suitable ground conditions.
An economical alternative to ground improvement involves excavating unsuitable soils and replacing them with more suitable ______
, ensuring a stable base.
An economical alternative to ground improvement involves excavating unsuitable soils and replacing them with more suitable ______
, ensuring a stable base.
The use of ______
, such as piles or drilled shafts, is a method to transfer loads to deeper, more competent bearing materials, bypassing shallow unstable layers.
The use of ______
, such as piles or drilled shafts, is a method to transfer loads to deeper, more competent bearing materials, bypassing shallow unstable layers.
Adapting structures through ______
to accommodate site conditions is a strategic approach that minimizes the impact of less-than-ideal soil.
Adapting structures through ______
to accommodate site conditions is a strategic approach that minimizes the impact of less-than-ideal soil.
Evaluating ground improvement alternatives based on their ______
to increase bearing capacity and decrease settlement is crucial in structural engineering.
Evaluating ground improvement alternatives based on their ______
to increase bearing capacity and decrease settlement is crucial in structural engineering.
Increasing the ______
of the soil results in decreased settlement, enhancing the soil's ability to support structural loads with minimal deformation.
Increasing the ______
of the soil results in decreased settlement, enhancing the soil's ability to support structural loads with minimal deformation.
Boosting the ______
strength of soil increases its bearing capacity, allowing it to support heavier loads and maintain stability.
Boosting the ______
strength of soil increases its bearing capacity, allowing it to support heavier loads and maintain stability.
Decreasing soil ______
variability results in reduced differential settlement, ensuring uniform support across a structure's foundation.
Decreasing soil ______
variability results in reduced differential settlement, ensuring uniform support across a structure's foundation.
______
granular materials or cohesive materials can improve soil properties such as strength and stiffness, essential for construction.
______
granular materials or cohesive materials can improve soil properties such as strength and stiffness, essential for construction.
______
can be increased through ground improvement techniques that decrease the void ratio and/or add a cohesive cementing component.
______
can be increased through ground improvement techniques that decrease the void ratio and/or add a cohesive cementing component.
Compressibility depends on the nature of the ______
and the initial stress state of the soil; it is not a unique value.
Compressibility depends on the nature of the ______
and the initial stress state of the soil; it is not a unique value.
______
can be increased by compaction and consolidation, which are imperative when improving fundamental soil behavior.
______
can be increased by compaction and consolidation, which are imperative when improving fundamental soil behavior.
Improved ground is modified to produce a zone of reduced ______
to control detrimental effects of groundwater.
Improved ground is modified to produce a zone of reduced ______
to control detrimental effects of groundwater.
Flow beneath a dam can lead to ______
and instability if not treated properly.
Flow beneath a dam can lead to ______
and instability if not treated properly.
Construction projects below grade often require ______
to make sure that the site does not get flooded.
Construction projects below grade often require ______
to make sure that the site does not get flooded.
If loose gramual materials are subject to a dynamic load, this can cause ______
during an earth quake.
If loose gramual materials are subject to a dynamic load, this can cause ______
during an earth quake.
Most common mitigation to the risk of having loose granular materials on site, is to ______
the soil, which reduces their liquefaction potential.
Most common mitigation to the risk of having loose granular materials on site, is to ______
the soil, which reduces their liquefaction potential.
Loose granular soil deposits generally ______
in volume during an earthquake by liquefaction.
Loose granular soil deposits generally ______
in volume during an earthquake by liquefaction.
Techniques to reduce liquefaction potential include both groundwater control and ______
, which can be a tedious process.
Techniques to reduce liquefaction potential include both groundwater control and ______
, which can be a tedious process.
Soils containing smectitic clays are subject to substantial volume changes in response to cycles of ______
.
Soils containing smectitic clays are subject to substantial volume changes in response to cycles of ______
.
A shrink/swell behavior of expansive soils can be detrimental to both buildings and cause a ______
to fail.
A shrink/swell behavior of expansive soils can be detrimental to both buildings and cause a ______
to fail.
Physical and engineering properties of soils are ______
, which affects it's performance when attempting to build a structure on the land.
Physical and engineering properties of soils are ______
, which affects it's performance when attempting to build a structure on the land.
If the ______
varies enough from location to location; this can cause an excessive differential settlement.
If the ______
varies enough from location to location; this can cause an excessive differential settlement.
Using ground improvement can modify properties of subsurface materials to provide a more ______
performance when constructing.
Using ground improvement can modify properties of subsurface materials to provide a more ______
performance when constructing.
The four defining principles to to Increasing Complexity of Ground Improvement include Control of water, Mechanical modification, Modification by additives, and Modification by inclusions or ______
.
The four defining principles to to Increasing Complexity of Ground Improvement include Control of water, Mechanical modification, Modification by additives, and Modification by inclusions or ______
.
Important Principles, Engineering Considerations, and Construction Method in Ground Improvement are Compaction, Soil mixing and injection methods, Stabilization and Solidification, Grouting, Dewatering and ______
.
Important Principles, Engineering Considerations, and Construction Method in Ground Improvement are Compaction, Soil mixing and injection methods, Stabilization and Solidification, Grouting, Dewatering and ______
.
You cannot “design” a ground improvement program without a full understanding of the construction means and methods, and credit for the development of ground improvement techniques lies largely with innovative ______
.
You cannot “design” a ground improvement program without a full understanding of the construction means and methods, and credit for the development of ground improvement techniques lies largely with innovative ______
.
The water content and ______
will significantly impact the efficacy of certain ground improvement techniques; knowing the saturation is a must.
The water content and ______
will significantly impact the efficacy of certain ground improvement techniques; knowing the saturation is a must.
Flashcards
Ground Improvement
Ground Improvement
Modifying ground to enhance its properties for construction.
Wattle and Daub
Wattle and Daub
An old construction technique using interwoven sticks and mud.
Improve Soil Properties
Improve Soil Properties
A ground improvement goal to increase density and shear strength.
Alternatives to Ground Improvement
Alternatives to Ground Improvement
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Avoid the Site
Avoid the Site
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Remove and Replace
Remove and Replace
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Transfer Load to Deeper Strata
Transfer Load to Deeper Strata
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Design Structure Accordingly
Design Structure Accordingly
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System Performance Perspective
System Performance Perspective
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Increase Soil Stiffness
Increase Soil Stiffness
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Increase Soil Shear Strength
Increase Soil Shear Strength
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Decrease Soil Variability
Decrease Soil Variability
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Shear Strength
Shear Strength
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Compressibility
Compressibility
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Hydraulic Conductivity
Hydraulic Conductivity
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Liquefaction Potential
Liquefaction Potential
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Shrink and Swell Behavior
Shrink and Swell Behavior
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Reduction In Variability
Reduction In Variability
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Control of Water
Control of Water
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Mechanical Modification
Mechanical Modification
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Modification by Additives
Modification by Additives
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Modification by Inclusions
Modification by Inclusions
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Compaction: Shallow Methods
Compaction: Shallow Methods
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Compaction: Deep Methods
Compaction: Deep Methods
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Grouting
Grouting
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Dewatering
Dewatering
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Importance of Contractors
Importance of Contractors
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Water Content Problems
Water Content Problems
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Study Notes
Ground Improvement Overview
- Ground modification is an age-old practice, seen in methods like using wattle and daub for tensile reinforcement in clay buildings, and baking straw into clay to improve strength.
- Romans using timber as a road base is another ancient example.
- Modern approaches include geogrids and geotextiles.
- Ground improvement techniques enhance soil characteristics to match desired project outcomes, increasing density and shear strength to improve stability.
- The techniques reduce soil compressibility and control groundwater flow to improve soil homogeneity.
- Ground improvement alters site foundation conditions or project earth structures to enhance performance under design and operational loads.
- First-order improvements, like compaction, increase soil density.
- Second-order effects include increased strength and reduced compressibility.
- Third-order effects include increased bearing capacity and improved liquefaction resistance.
- Alternatives to ground improvement are: avoiding the site, replacing the soil, transferring the load and designing a structure accordingly.
- Owner / developers can seek out alternative sites to the location of facilities.
- Replacing unsuitable soil materials with more suitable materials, like crushed stone, are frequently used when encountering localized fill.
- Deep foundations affect load transfer by the use of stiff structural members placed between the structure and competent bearing materials, like piles or drilled shafts.
- Structural redesign can accommodate the site conditions.
Improvement in Soil Behavior
- Ground improvement improves performance, improving the allowable bearing value of a structure on the supporting soils.
- Ground improvement alternatives increase bearing capacity and decrease settlement.
- Increases in soil stiffness can decrease settlement
- Increases in soil shear strength can increase bearing capacity
- Decreasing soil property variability can decrease differential settlement.
- Densifying granular or consolidating cohesive materials can increase soil strength and stiffness.
- Ground improvement enables increased shear strength via techniques that decrease the void ratio or add a cohesive component, improving slope stability and reducing liquefaction potential.
- Compressibility depends on the nature of the load application and initial stress state of the soil and isn't a unique value.
- Decreased compressibility increases soil stiffness via ground improvement techniques that reduce void ratio or add a cohesive component, as well as with compaction and consolidation of cohesive soil.
- Improved ground is modified to produce a zone of reduced permeability to control the detrimental effects of groundwater.
- Soil particle movement (piping) and instability from flow beneath a dam can be resolved with ground modification.
- Construction dewatering is needed for construction below grade and often below the water table.
- During an earthquake loose granular materials below the groundwater level can be subject to liquefaction.
- Mitigation of this risk is to densify the soils, which reduces their liquefaction potential.
- Other techniques to reduce liquefaction potential include groundwater and in' situ mixing.
- Smectitic clays can cause expansive soils soils undergo substantial volume changes due to cycles of wetting and drying.
- Progressive damage to buildings or retaining walls can occur due to shrink/swell soil.
- Physical and engineering properties of soils are naturally variable.
- Variability can cause an excessive differential settlement for planned structures.
- Ground improvement can modify subsurface material properties to provide more uniform performance.
Ground Improvement Techniques
- Four defining principles in increasing complexity: control of water, mechanical modification, modification by additives and modification by inclusions or confinement.
- Important principles include: Compaction, soil mixing, stabilization, grouting and consolidation.
- Ground improvement programs require designs that take construction methods and means into account to be effective.
- Credit for advances lies largely with innovative contractors, with many experts being or having been contractors.
Problems
- Water content and degree of saturation greatly impact the efficacy of ground improvement techniques.
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