MODEL WRITTEN ANSWER PLEASE. Markscheme: Answers should explain the process of s
ID: 1765310 • Letter: M
Question
MODEL WRITTEN ANSWER PLEASE.Markscheme: Answers should explain the process of site investigation and the use of a staged approach.?The importance of the desk study should be explained and should include examples of where data might be found which can inform the investigation stage. Reference to geology should be made and how historic maps can be used to inform the study. The inclusion of a walk over should be mentioned and higher marks will be awarded for answers which discuss what might be looked for during the walk over. Recent local work might be mentioned and observations of the neighbouring property and features included. The intrusive investigation stage should be discussed and should include types of intrusive investigation mention of methods such as trial pits dynamic sampling CPT testing boreholes both cable tool and rotary. Sample class should be mentioned answers which discuss class 1 sampling for high end testing will be awarded higher marks reference to the requirements of Eurocode should be included Good answers will develop a methodical order with good explanation of methods and will include some comment on applicability in various situations. Marks will be awarded for a good logical approach to the answer.
Answer the question from section A and two from section B SECTIONA A1. Consider a large derelict site in north east London. The site has previously been used for small manufacturing businesses, a car breakers and a concrete batching plant. Describe the process of site investigation which would need to be undertaken to enable a development for a major sporting event. This will include a stadium, velodrome and pool, together with accommodation and transport links. Give examples of the tasks which would be undertaken at each step of the investigation, and how the decisions will be influenced by the findings. Answers should refer to the requirements of Eurocodes to ensure reliable data for design. [10096] This question will form 40 % of the total paper marks
Explanation / Answer
Site Investigation is the process of collecting information, assessment of the data and reporting potential hazards beneath a site which are unknown.
Site Investigation is grouped into the following stages:
The primary objective of a site investigation is to determine as accurately as may be required-
Site investigation should be organized to obtain all possible information toward a thorough understanding of the subsurface condition and probably foundation behavior.
Background Information before Subsurface Investigation
Before actual field investigation is started, information should, whenever possible, be collected on:
Extent of Soil Investigation
Subsurface condition at a site may be relatively uniform or extremely variable and will largely determine the complexity of the problems to be faced in both design and construction of the foundations. The subsurface investigation must therefore be of sufficient extent to provide enough information for a thorough understanding of the interaction of proposed foundations and supporting soil or rock on which to base a safe and economical design.
Depth of Site Investigation
The site investigation should be carried to such a depth that the entire zone of soil or rock affected by the changes caused by the building or the construction will be adequately explored. This may be taken as a depth at which vertical stress induced by the new construction is smaller than 10% of the existing overburden stress at that level.
Where the depth of investigation cannot be related to background information, the following guidelines are suggested.
Stages of Site Investigation
The approach adopted for a particular site investigation, its extent and the techniques used will all depend upon the site-specific circumstances, and the experience and judgment of those involved. There is no single way to carry out an investigation, and inevitably different advisors will adopt different approaches for any particular project. However, it is usual for the site investigation to be a phased exercise.
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