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P. 1Ground InvestigationGround InvestigationRatings: (0)|Views: 30|Likes: 0Published by Elvis GrayGround InvestigationGround InvestigationMore info:Published by: Elvis Gray on Jan 11, 2013Copyright:Attribution Non-commercialAvailability:Read on Scribd mobile: iPhone, iPad and Android.download as PDF, TXT or read online from ScribdFlag for inappropriate content|Add to collectionSee moreSee lesshttps://www.scribd.com/doc/119913529/Ground-Investigation04/23/2014pdftextoriginal Section 3 Part 02 General SpecificationRev.0
2. BOREHOLES ............................................................................................................ 22.1 GENERAL ............................................................................................................. 22.1.1 Scope ................................................................................................................ 22.1.2 References ........................................................................................................ 22.2 BOREHOLES GENERALLY ................................................................................. 22.2.1 Method and Diameter ........................................................................................ 22.2.2 Addition of Water to the Borehole ..................................................................... 22.2.3 Backfilling .......................................................................................................... 32.3 PERCUSSION BORING ....................................................................................... 32.3.1 Hard Stratum or Obstruction in Percussion Boring ........................................... 32.4 AUGER BORING .................................................................................................. 32.4.1 Hand Auger ....................................................................................................... 32.4.2 Continuous Flight Auger Boring ........................................................................ 32.4.3 Hollow Stem Flight Auger .................................................................................. 32.5 ROTARY DRILLING .............................................................................................. 32.5.1 General.............................................................................................................. 32.5.2 Drilling Fluid....................................................................................................... 32.5.3 Rotary Drilling with Core Recovery ................................................................... 32.5.4 Rotary Drilling without Core Recovery .............................................................. 52.5.5 Backfilling .......................................................................................................... 62.5.6 Photographs ...................................................................................................... 62.6 BOREHOLES OVERWATER ................................................................................ 6
Section 3 Part 02 General SpecificationRev.0
2. BOREHOLES2.1 GENERAL2.1.1 Scope
1 Advancement of boreholes by percussion boring, auger boring, and rotary drilling insoils.2 Related Sections and Parts are as follows:This SectionPart 1, GeneralSection 4, PilingSection 6, Road worksSection 8, Sewerage
1 The following standards and other documents are referred to in this Part:BS 5930, Code of practice for site investigations.Engineering Group of the Geological Society Working Party Report
The logging of rock cores for engineering purposes (1970).
2.2 BOREHOLES GENERALLY2.2.1 Method and Diameter
1 The method of advancement and the diameter of a borehole shall be such that theboring can be completed and logged to the designated depth, and samples of thedesignated diameter can be obtained,
in situ testing carried out and instrumentationinstalled.2 The following methods may be employed for advancement of a borehole unlessotherwise designated:(a) percussion boring(b) auger boring (If hollow stem augering is proposed, the Contractor shall satisfy theEmployer that the SPT values obtained are not effected by disturbance of the soilby the auger head, or the presence of material within the hollow stem.)(c) rotary drilling.
2.2.2 Addition of Water to the Borehole
1 Jetting with water shall not be used to assist the advance of the borehole, exceptwhere approved by the Engineer. Where the borehole penetrates below the water tableand disturbance of the soils is likely, a positive hydraulic head shall be maintained inthe borehole.
2.2.3 Backfilling
1 The Contractor shall backfill boreholes in such a manner as to minimise subsequentdepression at the ground surface due to settlement of the backfill. In somecircumstances, grout or special infilling may he required by the Engineer. Whereartesian or other water conditions make normal backfilling impracticable, the Contractorshall consult and agree with the Engineer a procedure for sealing the borehole.
2.3 PERCUSSION BORING2.3.1 Hard Stratum or Obstruction in Percussion Boring
1 In a borehole where percussion boring is employed and a hard stratum or obstruction isencountered, the Contractor shall employ chiselling techniques for a period of up to 1h. Should this not penetrate through the hard stratum or obstruction the Contractorshall inform the Engineer, who may instruct the use of one or more of the following:(a) continuation of chiselling techniques(b) rotary or other approved drilling until the stratum is penetrated(c) abandonment of the borehole.
2.4 AUGER BORING2.4.1 Hand Auger
1 Hand auger boring may be appropriate in suitable self-supporting strata.
2.4.2 Continuous Flight Auger Boring
1 Where continuous flight auger boring is used, it shall be carried out under the full-timesupervision of a person meeting the requirements of Part 1 Clause 1.5 Paragraph 5Item (c) who shall produce, as boring proceeds, a record of the material andgroundwater encountered.
2.4.3 Hollow Stem Flight Auger
1 Where hollow stem flight auger boring is used, the equipment used shall be such as tobore and recover samples as designated. Sampling shall be carried out through thehollow stem.
2.5 ROTARY DRILLING2.5.1 General
1 Rotary drilling may be required for the recovery of cores, or for the advancement of ahole in rock, with or without core recovery.
2.5.2 Drilling Fluid
1 The drilling fluid shall normally be clean water, air or air mist. However, with theapproval of the Engineer, drilling muds, additives or foam may be used.
2.5.3 Rotary Drilling with Core Recovery
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