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Design Criteria for Road Construction Based on Topographical Survey Data

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Question: Using the survey data provided including the following files (Wg31º system), outline the design criteria needed :-  Proj 1Q1- (2024).kcd  Proj 1Q1- (2024).bot  Proj 1Q1- (2024).mal  Proj 1Q1- (2024).tr2  Proj 1Q1- (2024).mmb  Annexure A.pdf (image file)  Annexure A.jpeg (image file) Which must be accessed and downloaded from: - ‘Moodle’ – ‘Computer applications 3A’ – ‘Project 1’ – ‘Question 1’ The Topographical survey has extensively covered the area by means of an approx. 30m wide strip survey along the proposed route, which includes all natural and artificial features and existing services along the Examiner: Mr A Raghubar Computer Applications 3A (CPTA301) 2024 Semester I Page 2 of 6 road. This will serve as important information to the design and layout of the new tar road. The portion of road which is to serve as a taxi route has an expected length of approximately 5.0km upon completion. However, you are required to perform a full Road design utilising the Model maker and Road maker software to the following design specifications for a length of approximately 1.8 – 2.0km:- Design specifications for Single lane carriageway: Design speed 50km/hr Lane width 2.5m single lane Road camber - 2.5% left and right Kerb data Type: MK4 Shoulder width 1.5m slope= +4% Side slopes Cut= 1: 1 Fill= 1: 1.5 Trapezoidal Drain specifications slope 1= 1:1 width= 0.40m slope 2= 1:100 width= 0.20m slope 3= 1:1 width= 0.40m Layer works specifications: First (Top) layer: width= 2.5m thickness= 0.04m Second layer: width= 2.6m thickness= 0.10m Third layer: width= 2.7m thickness= 0.14m Road reserve= 15m Compaction factor= 0.90 Where the above design specifications cannot be satisfied, the values may be adjusted accordingly within reason, however any such changes must be justified in your report.

Asked by mandisa

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From the given data, the design specifications for a single-lane carriageway road with an approximate length between 1.8 - 2.0 km can be summarized as: 1. Design Speed: The road should be designed for a speed of 50 km/h. This is the speed that vehicles are expected to safely travel at, under favorable road and traffic conditions. 2. Geometry: The road should consist of a single lane with a width of 2.5m. The road camber, which is the cross slope provided to raise middle of the road for drainage of rain water, should be 2.5% left and right. 3. Kerb Data Type: The chosen kerb for this design would be MK4. The design will need to accommodate this type around the margins of the road. 4. Shoulder: The road design should include a shoulder that is 1.5m wide with a slope of +4%. The shoulder serves as a safety zone for broken-down vehicles and also supports the pavement structure. 5. Side Slopes: The measurements for cut and fill slope ratio should be 1:1 and 1:1.5 respectively. Cut slopes are created when an area is excavated, and fill slopes are created on the edge of embankments, where soil is placed. 6. Trapezoidal Drain Specifications: To facilitate drainage, necessary trapezoidal slope designs are needed with measurements for slope and width, respectively, as - slope 1 (1:1, 0.40m), slope 2 (1:100, 0.20m), slope 3 (1:1, 0.4m). 7. Layer Works Specifications: The design needs to stipulate for three different layers with their respective widths and thicknesses. The top layer should have a width of 2.5m and a thickness of 0.04m. The second layer should be 2.6m wide with a thickness of 0.10m. The third layer should have a width of 2.7m and a thickness of 0.14m. 8. Road Reserve: The available space for the road should be a minimum of 15m in width with a compaction factor of 0.90. These specifications could be subject to change if site conditions render them unsuitable. If such changes are made, they must be within a reasonable scope and justified in the final design report. Ensure that you download the relevant data from the shared Moodle path and import it into your modeling software so you can follow these specifications. This should include survey data, topographic coverage, road features, and services. The survey data will likely be very important for the road layout in the road design software. Once the data has been imported and analyzed, the road profile can be created according to the specifications outlined above. This will include modeling the lanes, shoulders, drains, kerbs, and embankments, as well as any other necessary features. Be sure to adjust your design specifications as needed to resolve any discrepancies and complete a safe and efficient design.

Answered by gpt-4

April 19, 2024, 8:04 a.m.

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This article was generated in part by one of OpenAI’s large-scale language-generation model, answering user mandisa's question. Images were generated with OpenAI's AI model, DALL·E 2. The Internet takes ultimate responsibility for the content of this publication.
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Published: Friday, April 19, 2024

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