Reference no: EM132975783

SEV254 Road and Pavement Engineering - Deakin University

Assessment task - Road Design

Objectives
This assessment task relates to the Unit Learning Outcomes 1, 2 and 4. It aims to develop students' ability to evaluate and design road geometric elements including road earthworks in accordance with current Australian design guidelines.

Project Details & Inputs
A section of a two-way two-lane rural road is to be constructed with the design speed of 90 km/h, connecting Point A (CH0+000) and Point B near the rural part of Geelong, Victoria. You are required to design the geometric elements of this road section. The design should cover roadway/route location, horizontal and vertical alignments, cross-sectional elements and earthworks to satisfy the safety, economic and aesthetic conditions. The following are the project's specific information and constraints obtained from field surveys or supplied by relevant stakeholders:
• The coordinates and levels of Point A and Point B, and terrain features of the area where the road is to be constructed are provided in the topographic map (attached in Assessment 1 folder on the unit site).
• There will be only one horizontal curve for this road section (Note: this is to reduce the workload required for this assessment task. For actual projects, the number of curves is reasonably decided based on the topographic features and other design constraints).
• The truck traffic is negligible, hence, only car traffic is considered for the design (Note: this is to reduce the workload required for this assessment task. For actual projects, you may need to consider both cars and trucks).
• Radius of the horizontal curve is given by: R = 340 + 5xt (m), where t is the last digit of your student ID (e.g. t = 1 if the student ID is 987654321). You must check whether this radius satisfies the design requirements or not before using it for the design of relevant road elements.
• Traffic lane width is 3.5 m and shoulder width is 1.5 m. The verge dimension is negligible.
• Normal crossfall is -3% for the traffic lanes and -5% for the shoulders.

• Batter slope of cut is 1:1, and batter slope of fill is 1:2 (vertical : horizontal).
• Maximum height of fill is 4 m and maximum depth of cut is 5 m.
• The shrinkage factor of soil at the location where the road will be constructed is 7%.
• Street lighting will be provided for this road section
• The earthwork free haul distance is 150 m.
• Other required information can be reasonably assumed based on engineering judgements and Austroads Guides.

Questions and Report Content
Required contents of the report are as follows:
• Presentations of title page, executive summary, table of contents, list of figures and tables.

• Chapter 1: Project Introduction
In this chapter, you are required to introduce the details of design problem, methodology to be used and expected outcomes.

• Chapter 2: Roadway Location
In this chapter, you are required to complete the following tasks:
» Task 2.1: Locate and draw two alternative roadways locations connecting Point A and B on the topographic map showing the length of straight sections and deflection angles (Note: justifications should be given to come up with reasonable roadway locations).
» Task 2.2: Compare the qualities of these two alternative routes (e.g. safety, economic, compliance of design constraints, etc.) and then choose the best route for further designs in the following chapters.

• Chapter 3: Horizontal Alignment Design
In this chapter, you are required to complete the following tasks:
» Task 3.1: Determine the superelevation development parameters (i.e. e, Le, Sro, Tro, etc.) for this road.
» Task 3.2: Design horizontal alignment elements (i.e. tangents, circular curves and transition curves). Present a design table showing the CHs of all control points on the horizontal curve (e.g. TS, SC, TC, etc.) as well as other relevant parameters that are needed for the calculation

of the CHs of these control points.
» Task 3.3: Draw the horizontal alignment of the road on the topographic map showing the lengths of tangents, circular curve and transition curves, and the CHs of all control points (e.g. TS, SC, CS, ST, etc.). (1.5 mark)
» Task 3.4: Determine the CHs of four points where the superelevations of shoulder and traffic lane on the outer side of the road start to develop and where they end (i.e. back to normal crossfall)

• Chapter 4: Vertical Alignment Design
In this chapter, you are required to complete the following tasks:
» Task 4.1: Draw the natural ground surface along the horizontal alignment of the road. Then, draw grade sections on this natural ground surface and provide justifications on how the grades satisfy the design constraints, balance earthwork and coordination conditions (Note: the drawing should show the natural ground, the slopes and grade lengths, and the CH and RL of vertical intersection points).
» Task 4.2: Design vertical alignment elements (i.e. grades and vertical curves). Present a design table showing the CHs and RLs of all control points on the vertical curves (e.g. PVI, BVC, Midway, EVC, Apex, etc.) as well as other relevant parameters that are needed for the calculation of the CHs and RLs of these control points.
» Task 4.3: Draw the vertical alignment of the road showing the CHs and RLs of all control points and also the CHs of TS and ST points. Based on this, determine and tabulate the depth/height of cut/fill at 100 m intervals over the road length.

• Chapter 5: Cross-section Design and Earthwork
In this chapter, you are required to complete the following tasks:
» Task 5.1: Determine and tabulate the road cross-section levels at 10 m interval within the superelevated section (from the start of shoulder crossfall development until the shoulder crossfall is back to normal crossfall) showing the CHs and RLs of left end of shoulder, left end of traffic lane, centreline, right end of traffic lane and right end of shoulder.
» Task 5.2: Draw the cross-sections of this road at 100 m intervals showing the road dimensions, cut/fill batter slopes and natural ground (the depths of pavement and road crossfalls can be neglected). Calculate the areas of these cross-sections (Note: the drawings of cross-sections are not necessarily in correct scale, but all necessary dimensions and calculated areas have to be shown).
» Task 5.3: Calculate and tabulate earthwork quantities (i.e. cut and fill volumes, cumulative volume, etc.) for the areas of cut/fill at 100 m interval over the road length.
» Task 5.4: Draw mass haul diagram and discuss the properties of the mass haul diagram. Calculate the volumes of over-haul and free-haul earthwork material for the entire road section.

• Chapter 6: Checking and Evaluating Other Design Factors
In this chapter, you are required to complete the following tasks:
» Task 6.1: Identify and check the stopping sight distance requirements for all necessary locations on the designed road.
» Task 6.2: As the road curve is located near a residential area, it requires to build sound walls along two sides of the horizontal curve (from the start to the end of the superelevation development) to reduce the impact of traffic noise. Draw the geometry of the problem and determine the nearest distance of the sound walls from the road centerline to ensure safety for road users.

» Task 6.3: List and discuss any other potential factors/constraints that should be considered when the designed road is located near a residential area.

Attachment:- Road and Pavement Engineering.rar