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solve this problem with calculation
4 A hand auger and Scala penetrometer test were performed at Ilam fields. The results have been summarised for you in the borelog in Table 2 on the next page. These results include Scala penetration resistance as blows $/ 100 \mathrm{~mm}$ and descriptions of soil type. Use these data to complete this question.
This site is proposed as a location to construct a new two-storey timber frame building. The preliminary foundation design specifies a footing width of $1 \mathrm{~m}$. Your task is to identify appropriate ultimate bearing capacities and foundation depths based on the provided site investigation data.
Use the New Zealand Standards NZS3604-2011 (Section 3.3.7), available on LEARN, to provide foundation recommendations at the site. Your recommendations should state whether the soil at your site meets the requirements stated in this standard for an ultimate bearing capacity of $300 \mathrm{kPa}$ at the ground surface. If the criteria are not met at the ground surface, then how deep must the foundation be to meet the requirements (assuming the foundation width stated above of $1 \mathrm{~m}$ )? (30 marks)
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Answer from Sia

Posted 4 months ago

Solution by Steps

step 1

Review the site investigation data provided in the borelog and identify the soil types and their corresponding Scala penetration resistance values

step 2

Refer to the New Zealand Standards NZS3604-2011, specifically Section 3.3.7, to determine the criteria for ultimate bearing capacity for different soil types

step 3

Calculate the ultimate bearing capacity for the soil at the ground surface using the Scala penetration resistance values and the criteria from the NZS3604-2011 standard

step 4

If the ultimate bearing capacity at the ground surface is less than 300 kPa, use the standard to find the required depth at which the soil has an ultimate bearing capacity of at least 300 kPa

step 5

Provide foundation recommendations based on the calculations and the standard, including the appropriate ultimate bearing capacities and foundation depths

Answer

The solution requires a detailed analysis of the borelog data and application of the NZS3604-2011 standard to determine the ultimate bearing capacity and required foundation depth. The exact values cannot be provided without the specific data from the borelog.

Key Concept

Ultimate Bearing Capacity and Foundation Depth Determination

Explanation

The ultimate bearing capacity is the maximum pressure that the soil can withstand without failure, and the foundation depth is the depth at which this capacity meets or exceeds the design requirements. The NZS3604-2011 standard provides guidelines for determining these values based on soil type and penetration resistance data.

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