What information should be included in a soil report
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What information should be included in a soil report

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What information should be included in a soil report


In the previous article (Soil report) we explain meaning by soil report and take general view about the information inside it. Here we will go deep inside the most and important information should include in soil report.


1- Introduction.


In the introduction section, the geotechnical engineer should mention the main objective of the soil report or investigation report. Also, mentioned the site number, plot number, name of project, client, and main contractor names, etc.


2- Regional geology.


In this section geotechnical engineer describe the geological condition in this area and basic soil information.


3- Field work.


Include the start and completion date, the scope of work, total number of boreholes done with the depth of every borehole, number and type of tests conducted in site and in laboratory. Good soil report should have clear site plan drawings with location of boreholes.


4- Methodology.


Include the methods of boreholes drilling and methods of tests conducted. Also, soil report should have the log sheets of the drilled boreholes as well as the laboratory test and in-situ test results as annexes of the report.


5- Laboratory testing.


In this section geotechnical will explain in detail the laboratory testing program was implemented to confirm the visual classifications, define index properties, and determine corrosion potential of soil, rock, and groundwater table. Also, describe the standard test methods used for test soil and rock. All these data should put in the laboratory tests carried out on boreholes table. The table should include information such as type of test, standard test methods and number of tests with copy of all test results as annexes of the soil report.


6- Groundwater condition.


In this section, geotechnical engineer will mention the water table level during the drilling period.


7- Soil conditions.


In this section the geotechnical engineer will explain the types of soil at different depth based on boreholes test results. Also, give statement for liquefaction status at the site. This can be in general site stratigraphy table. The stratigraphy table can include approximate elevation by meter and strata description.


8- Conclusions.


Base on in-situ and laboratory test results, the allowable bearing value can be obtained and according to this value, the geotechnical engineer can decide the type of foundation will be used in site such as shallow foundation or deep foundation. Also, can decide the required water table level and if required to use dewatering system or not. In case of required to excavate and replace the existing soil by another type of soil such as engineer fill materials, the geotechnical engineer should describe the required excavate depth, type of replacement soil, the thickness backfilling layer, the maximum dry density requirements, etc.


9- Slope stability.


In this section the geotechnical engineer will give recommendation about a safe slope requirement during excavation. This can be done at save slope angle table. This table can include soil type, average SPT test, H: V (horizontal to vertical) ratio and slope angle.


10- Construction approaches.


The soil report should contain suggestions concerning the method of construction. Such as need for dewatering excavation, the need for casing piles, and considerations of settling of soil around excavations causing damaged to nearby structures.

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