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Evidence Guide: AHCARB810 - Analyse edaphic interactions of trees and structures

Student: __________________________________________________

Signature: _________________________________________________

Tips for gathering evidence to demonstrate your skills

The important thing to remember when gathering evidence is that the more evidence the better - that is, the more evidence you gather to demonstrate your skills, the more confident an assessor can be that you have learned the skills not just at one point in time, but are continuing to apply and develop those skills (as opposed to just learning for the test!). Furthermore, one piece of evidence that you collect will not usualy demonstrate all the required criteria for a unit of competency, whereas multiple overlapping pieces of evidence will usually do the trick!

From the Wiki University

 

AHCARB810 - Analyse edaphic interactions of trees and structures

What evidence can you provide to prove your understanding of each of the following citeria?

Determine soil attributes for a specified site

  1. Investigate angle of repose of soils and impact on structures
  2. Investigate soil plasticity and impact on structures
  3. Investigate the effects of soil moisture on cohesion and plasticity
  4. Investigate modes of soil liquefaction and soil stability
  5. Conduct tests on soil properties to establish soil stability for specified site
  6. Assess level of soil cohesion for site
  7. Determine shear strength of soil for site
  8. Investigate load bearing capacity of soil for site
  9. Determine mass of the soil plate for site
Investigate angle of repose of soils and impact on structures

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Investigate soil plasticity and impact on structures

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Investigate the effects of soil moisture on cohesion and plasticity

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Investigate modes of soil liquefaction and soil stability

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Conduct tests on soil properties to establish soil stability for specified site

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Assess level of soil cohesion for site

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Determine shear strength of soil for site

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Investigate load bearing capacity of soil for site

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Determine mass of the soil plate for site

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Determine root attributes for trees on site

  1. Determine tree root morphology, division and distribution
  2. Determine amount of buttressing
  3. Determine anatomical features of tree roots for identification purposes
  4. Identify tree roots based on anatomical features
Determine tree root morphology, division and distribution

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Determine amount of buttressing

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Determine anatomical features of tree roots for identification purposes

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Identify tree roots based on anatomical features

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Calculate forces from roots

  1. Research, test and determine forces and pressures exerted by trees through roots in soil
  2. Estimate and measure dimensions of roots exerting a force on structures on site
  3. Calculate total surface area of the roots exerting a force on structures on site
  4. Calculate force exerted by roots per unit of surface area of structure
  5. Calculate total force exerted by roots of a given surface area
Research, test and determine forces and pressures exerted by trees through roots in soil

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Estimate and measure dimensions of roots exerting a force on structures on site

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Calculate total surface area of the roots exerting a force on structures on site

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Calculate force exerted by roots per unit of surface area of structure

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Calculate total force exerted by roots of a given surface area

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Determine attributes of structures

  1. Measure and determine volume of structures impacted by roots
  2. Research and calculate mass of structures on site
  3. Determine the impact of gravity on structural mass
  4. Determine effect of leverage of forces exerted by tree roots on structures
Measure and determine volume of structures impacted by roots

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Research and calculate mass of structures on site

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Determine the impact of gravity on structural mass

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Determine effect of leverage of forces exerted by tree roots on structures

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Define the root–soil matrix factors for root/soil breakage

  1. Determine factors of root–soil matrix interactions
  2. Investigate area of contact between root and soil
  3. Investigate elasticity, tensile strength and breaking stress of roots
  4. Investigate root cross-sectional morphology
  5. Assess root plate for factors that may contribute to failure
  6. Estimate impact of static and dynamic testing for root plate stability
  7. Evaluate the likelihood of root failure by root breakage
  8. Evaluate the likelihood of anchorage failure by soil breakage or slippage
Determine factors of root–soil matrix interactions

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Investigate area of contact between root and soil

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Investigate elasticity, tensile strength and breaking stress of roots

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Investigate root cross-sectional morphology

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Assess root plate for factors that may contribute to failure

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Estimate impact of static and dynamic testing for root plate stability

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Evaluate the likelihood of root failure by root breakage

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Evaluate the likelihood of anchorage failure by soil breakage or slippage

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Research structural engineering solutions

  1. Investigate and assess effects of increasing mass of structure to prevent damage
  2. Investigate and assess methods and effects of increasing the modus of rupture to prevent damage
  3. Investigate and assess effects of use of curved structures to prevent damage
  4. Investigate and assess effects of soil mass and friction on structure stability
  5. Investigate and assess effects of anchors, braces and props on trees to improve stability
  6. Compile investigations and assessments into a reference portfolio
Investigate and assess effects of increasing mass of structure to prevent damage

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Investigate and assess methods and effects of increasing the modus of rupture to prevent damage

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Investigate and assess effects of use of curved structures to prevent damage

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Investigate and assess effects of soil mass and friction on structure stability

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Investigate and assess effects of anchors, braces and props on trees to improve stability

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Compile investigations and assessments into a reference portfolio

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Prepare stability and expert witness reports

  1. Prepare report on potential tree damage to structure
  2. Provide design suggestions to mitigate potential damage
  3. Review root plate evaluation and prepare report on stability of tree
  4. Provide design suggestions to mitigate likelihood of tree failure
  5. Prepare final report on potential structure and tree stability
Prepare report on potential tree damage to structure

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Provide design suggestions to mitigate potential damage

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Review root plate evaluation and prepare report on stability of tree

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Provide design suggestions to mitigate likelihood of tree failure

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Prepare final report on potential structure and tree stability

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Communicate with project personnel

  1. Discuss installation and protection measures with project personnel using industry-specific language
  2. Negotiate and resolve installation and protection issues
Discuss installation and protection measures with project personnel using industry-specific language

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Negotiate and resolve installation and protection issues

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Assessed

Teacher: ___________________________________ Date: _________

Signature: ________________________________________________

Comments:

 

 

 

 

 

 

 

 

Instructions to Assessors

Required Skills and Knowledge

An individual demonstrating competency must satisfy all of the elements and performance criteria in this unit.

There must be evidence that the individual has analysed the edaphic interactions of trees and structures for a specific site and has prepared a minimum of two reports, which must include:

a report on damage to structures by tree roots

a report on the stability of tree with a defective or damaged root plate.

There must also be evidence that the individual has:

investigated soil conditions that contribute to structure and tree stability, including:

angle of repose of soil materials

soil plasticity

impact of soil moisture on soil cohesion and plasticity

modes of soil liquefaction

investigated and tested soils for properties affecting soil conditions, including:

measured soil moisture content and field capacity

determined soil texture

assessed level of soil cohesion

determined shear strength of the soil

investigated load bearing capacity of soil

calculated mass of the soil plate

determined root morphology, division and distribution and amount of buttressing of tree

determined species characteristics for development of tap root system

determined anatomical features of tree roots and identified tree roots for a given tree

conducted research tests to determine forces and pressures exerted by trees through the soil

estimated and measured dimensions of roots exerting a force on a structure

calculated total surface area of the roots exerting a force on a structure

calculated force exerted by roots per unit of surface area of structure

calculated total force exerted by roots of a given surface area

measured and determined volume of structure

researched and calculated mass of structures

determined impact of gravity on mass

determined effect of leverage on the forces exerted by tree roots on structure

determined factors of root–soil matrix interactions

investigate area of contact between root and soil

investigated elasticity, tensile strength and breaking stress of roots

investigated root cross-sectional morphology

assessed root plate for damage, deficiencies or defects that may contribute to tree failure

estimated impact of static and dynamic testing for root plate stability

evaluated possible root failure by root breakage

evaluated possible anchorage failure by soil breakage or slippage

investigated and assessed:

effects of increasing mass

methods for, and effects of, increasing the modus of rupture

effects of use of curved structures

effects of soil mass and friction

effects of use of anchors, braces and props

compiled investigations and assessments into reference portfolio

created a report of potential tree damage to structure and provided design suggestions to mitigate damage

reviewed root plate assessment, prepared final report on stability of tree and provided design advice to mitigate potential tree failure

created an expert witness report on potential structure or tree stability

discussed installation and protection measures with project personnel

negotiated and resolved anomalies in installation and protection measures.

An individual must be able to demonstrate the knowledge required to perform the tasks outlined in the elements and performance criteria of this unit. This includes knowledge of:

impact of soil on the stability and structural integrity of structures and trees, including:

angle of repose of soil

soil plasticity

soil moisture content

field capacity of soil

effects of soil moisture on soil cohesion and plasticity

modes of soil liquefaction

testing soils for performance characteristics and soil stability, including:

soil texture

soil cohesion

soil moisture and field capacity

shear strength of soils

load bearing capacity

calculating mass of soil plate

tree root structures and their impact on soils and stability, including:

root morphology

root division

root distribution

buttressing

species development of tap root systems

identification of tree roots based on anatomical features

pressures exerted by tree roots, including:

experimental modelling of tree root damage

testing tree roots impact on structures and soils

direct and indirect forces and pressures exerted in soils by trees

techniques and methods of estimating and measuring dimensions of roots

factors of root–soil matrix interactions

area of contact between root and soil

elasticity of roots

tensile strength of roots

breaking stress of roots

root cross-sectional morphology

calculations for determining forces exerted by tree roots, including:

total surface area of the roots exerting forces on structures

forces exerted by roots per unit of surface area of structure

total force exerted by roots of a given surface area

measurement of volume of structures

calculating the mass of structures and the impact of gravity on mass

effect of leverage on the forces exerted by tree roots onto structure

tree root health and condition and impact on tree stability, including:

size of root plate and extent of root plate damage

extent of root plate deficiencies

extent of root plate defects

impact of static and dynamic testing for root plate stability

likelihood of root failure by root breakage and failure of root plate

likelihood of anchorage failure by soil breakage or slippage

considerations of structural design and development, and tree support to mitigate potential tree or structure damage, including:

effects of increasing mass of structure

effects of structure design and curvature of shape on strength of structures

effects of soil mass and friction

effects of increasing the modus of rupture

effects of use of tree support mechanisms

Australian standards relevant to trees on development sites

structure designs for mitigation of tree damage and failure

tree protection measures

creating reference portfolios of research and investigations, including annotations and calculations

documenting and reporting procedures, report preparation and communicating results of analysis, including:

test results and assumptions

expert witness reports, their purpose and design

using the correct language in reports and reporting

fundamentals of the concepts, basic science and technology of structural engineering, construction and architecture as relates to arboriculture and impact of trees on structures.