Geotechnical Investigation

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Geotechnical Investigation Step 1 - Gather Existing Information Structure Data Bridge, building, street, divider, and so forth. Sort - stories, loads, materials, and so forth Known Soil Data Your own insight into the region Geologic or different maps Other individuals Aerial photographs

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Geotechnical Investigation Step 2 - Field Investigation Site Recon - Before you move any hardware to site, visit the site A visual examination can let you know a ton: Site get to existing structures confirmation of old structures ecological risks non-built fill sinkholes geology state of close-by structures

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Geotechnical Investigation Step 2 - Field Investigation - cont'd Subsurface Investigation Test Pits - openings burrowed with an escavator Borings Solid Flight Hollow Stem Rotary Wash

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Geotechnical Investigation Step 2 - Field Investigation - cont'd Borings used to get tests at different profundities Samples required rely on upon venture Most normal technique for inspecting is the Standard Penetration Test - SPT Recall SPT is 140 lb pound dropped 30"

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Geotechnical Investigation Borings - cont'd Drill fix – Hollow Stem Auger - SPT

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Geotechnical Investigation Borings - cont'd Drill fix – Hollow Stem Auger - SPT

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Geotechnical Investigation Borings - cont'd Drill fix – Hollow Stem Auger - SPT

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Geotechnical Investigation Borings – cont'd # of borings venture subordinate For a building, will commonly begin with corners and in the center Based on what is discovered, more borings can be bored as expected to characterize ranges of concern or to acquire extra information

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Geotechnical Investigation Borings – cont'd Layout relies on upon impression too Depth relies on upon foreseen soil conditions and establishment sort We need to make certain we test all dirt possibly affected by the establishment framework

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Geotechnical Investigation Borings – What are we searching for? Soil arrangement Soft compressible soils Competent establishment soils Bedrock Ground water Any other subsurface that could influence the venture

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Geotechnical Investigation Step 3 – Laboratory Investigation Most regular tests include: Plasticity (atterbergs) Sieve Moisture Unit Weight Proctor Strength tests (unconfined, coordinate shear, and so on.)

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Geotechnical Investigation Step 4 – Design The outline procedure will consider all information Consider loads, soils, sort and utilization of office, and so on. GE regularly asks "what is required" versus what is figured

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Geotechnical Investigation Step 4 – Design – cont'd Some of the principle things passed on to customer: Types of soils Groundwater Recommended establishment sort or choices in addition to plan and development criteria Depth to bedrock Excavatability Soil compaction criteria Slope suggestions Retaining divider outline Boring and Lab test comes about

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