Bs 5930 Pdf
What is BS 5930: 1999+A2:2010? Stipulating the code of good practice for site investigations, BS 5930:1999+2:2010 helps to assess the suitability of sites for construction operations and civil engineering works.
Full Revision of BS 5930 Published BS 5930 in various versions has been the ‘standard’ for all UK ground investigation for several decades. It has been the reference or ‘go to’ document for all those involved with specifying intrusive ground investigations. There was some doubt as to whether the document would survive the influx of new standards associated with the UK adoption of Eurocodes in 2010. Fortunately enough practitioners in the industry stated the case to retain the standard as the valuable discursive document it has always been! After several years in the drafting, the fully rewritten and updated version of BS 5930 has now been published.
Density testing is conducted using the average of three results to obtain a significant result. The use of the sand replacement and core cutter test are common and the use of water replacement, rubber balloon, and nuclear methods are also used.
BS 5930:2015, 'the code of practice for site investigations', is a UK code of practice which came into effect on 31 July 2015 British Standards Institution. Code of practice for ground investigations. Subscribe our Newsletter. BS 5930:2015 Code of practice for ground investigations 5th October 2015.
Can be useful in site investigation for determining layers of rock other geological features, locating aquifers, mineral deposits, voids – natural or man-made and engineering properties of the ground. Electrical resistivity and seismic methods amongst others are used. This is a specialized field.
Section 1 Preliminary Considerations Pages 3–6 Seven factors to be cognizant of at this stage are: suitability of the site for the proposed works, economic and adequacy of design, optimum method of construction with reference to potential issues due to ground and groundwater. The effect of changes to the ground and environment due to the works, and, therefore the effect on the works from these changes. Consideration of suitability on a selection of sites. And finally, the existing works and their implications. If a site has been used in the past, this is a major factor in the investigation, mining, quarrying, landfill or waste disposal, industrial usages, archaeological or ecological factors may all have a bearing on the intended works. The cost of an SI is low relative to the project cost and when conducted thoroughly can be a significant saving later. Investigations should evaluate the nature of the ground and groundwater.
BS5930:2015 is a further full revision of the standard, and introduces some principal changes including: compliance with BS EN 1997-1 and BS EN 1997-2 and related test standards; new information on geophysical surveying and ground testing, and updated guidance on desk studies, field reconnaissance, ground investigations on contaminated ground and ground affected by voids; the requirements of data capture in the field and in the inclusion of this in reporting. Section 1 Preliminary Considerations Pages 3–6 Seven factors to be cognizant of at this stage are: suitability of the site for the proposed works, economic and adequacy of design, optimum method of construction with reference to potential issues due to ground and groundwater.
The document gives guidance on legal, environmental and technical matters relating to and includes a section on the description and classification of and. BS5930:1999 was amended in December 2007 to avoid conflict with the newly introduced 'Geotechnical Design' and the code is to be retained as a normative reference. BS5930:2015 is a further full revision of the standard, and introduces some principal changes including: compliance with BS EN 1997-1 and BS EN 1997-2 and related test standards; new information on geophysical surveying and ground testing, and updated guidance on desk studies, field reconnaissance, ground investigations on contaminated ground and ground affected by voids; the requirements of data capture in the field and in the inclusion of this in reporting.
The use of cement based grout can be used - is also used to decrease shrinkage. Sampling quality can be classified to determine depending on their disturbance and other factors such as, wet or dry ground. Samplers should conform to the standard. Sampling takes different forms i.e. – continuous sampling, the sand and window sampler and block sampling.
Where a site is contaminated it is appropriate at this stage to plan site safety procedures for any further investigations. Planning the details of further investigations is appropriate too. Existing records, local authorities, industry, libraries, present or past OS maps and aerial photography or even anecdotal information are to be used. A site reconnaissance should also be conducted at this stage and includes a thorough visual inspection of any exposed cuttings and note taken of level of vegetation. The surroundings should also be noted.
Bearing tests are used to determine the shear strength and deformation characteristics of a soil. Is done using a system similar to the laboratory shear box test. Large scale testing should be assessed on a case by case basis. Or of a structure after field tests have been conducted are examples of phenomena which may be considered as back analysis, this be conducted successfully when accompanied by a full investigation to determine the ground and ground water conditions.
Section 2 Ground investigations Pages 7–23 This is a natural follow on from the desk study, the objectives are similar – acquiring sufficient information for design, assessing the hazards. Depending on the works the investigations will differ i.e.
Ground water conditions are determined from water level in boreholes and the use of standpipe, hydraulic, electrical and pneumatic piezometers. Water samples should be representative and stored in appropriate containers.
Defects of existing works, slope failure or new works. Soil profile and condition should be established. Temporary or permanent changes should be investigated this involves changes in stresses and strains, moisture content, strength and compressibility. Certain areas will have old mines and underground cavities which need investigation.
Bs 5930 Pdf
Investigations should evaluate the nature of the ground and groundwater. The size and nature of the works will have a bearing on the investigations as will its former use as a site or contamination of ground or groundwater.
Or of a structure after field tests have been conducted are examples of phenomena which may be considered as back analysis, this be conducted successfully when accompanied by a full investigation to determine the ground and ground water conditions. Can be useful in site investigation for determining layers of rock other geological features, locating aquifers, mineral deposits, voids – natural or man-made and engineering properties of the ground. Electrical resistivity and seismic methods amongst others are used. This is a specialized field. The geophysical adviser should be involved at all stages.
This new version of the standard for ground investigation in the UK may represent the last time that the document is updated in such a comprehensive manner. BS 5930: 2015 now makes onward reference to all the current suite of British Standards that have appeared since the UK adoption of Eurocodes into UK practice in April 2010.
It should cover all ground affected by stresses and strains to an appropriate depth and breadth. Excavations, probing and geophysical surveying are used to investigate the ground. Intrusive investigations should be sited, spaced and backfilled with care. The GI should give sufficient information to make good decisions on design, construction material selection.
Bs 5930 Code Of Practice
The effect of changes to the ground and environment due to the works, and, therefore the effect on the works from these changes. Consideration of suitability on a selection of sites. And finally, the existing works and their implications. If a site has been used in the past, this is a major factor in the investigation, mining, quarrying, landfill or waste disposal, industrial usages, archaeological or ecological factors may all have a bearing on the intended works. The cost of an SI is low relative to the project cost and when conducted thoroughly can be a significant saving later. Investigations should evaluate the nature of the ground and groundwater. The size and nature of the works will have a bearing on the investigations as will its former use as a site or contamination of ground or groundwater.
Temporary or permanent changes should be investigated this involves changes in stresses and strains, moisture content, strength and compressibility. Certain areas will have old mines and underground cavities which need investigation. The ground investigation should be given enough time to be conducted before works are designed, this may involve in predicting ground condition at various times of the year. Due to the potential flexibility and size of an investigation, adequate supervision, equipment, testing, personnel, and audits should be provided in a safe manner. The extent of the GI can depend on many variables such as, character of site, availability of equipment and personnel and costs of methods.
Density testing is conducted using the average of three results to obtain a significant result. The use of the sand replacement and core cutter test are common and the use of water replacement, rubber balloon, and nuclear methods are also used. In-situ testing data is important to design of works. Stress measurement in rocks and soils can be determined.