Geotech C2

通報

問題一覧

Required for test like to determination of a specific gravity, grain size, plasticity, and etc.

disturbed soil samples

The number of blaster card to penetrate the final 300 mm

n-value,blow count,penetration number

Obtain by auger boring wash boring rotary boring

Disturbed Soil Samples

Ar%=Do2-Di2Di2x100%

Area Ratio Formula

The procedure of determining surface and sub surface conditions in an area of proposed construction

Site Investigation

a soil sample can be considered undisturbed if the area ratio is

less than or equal 10%

Refers to the removing soil from the hole

Sampling

required for test like to determination of compressibility, permeability, etc.

undisturbed soil samples

For buildings with basements, the death of boring should extend to ...… Of the Structures footprint added to the depth of the basement

twice the least dimension

Two types of soil samples

disturbed and undisturbed

Measures the undrained, sheer strength of a sample the sample must be composed of clay or seal, undrained means there is no volume change

Vane Shear Test

Refers to determining characteristics or properties of the soil

testing

Types of augers

solid stem hollow stem

Types of boring

auger boring, test pits, core boring

Three types of testing

SPT, CPT, VST

Maximum depth of hand operated order

n-Value correction

Overburden Pressure, Hammer Efficiency, Corrected N-Value

Obtain by thin wall samplers

undisturbed soil samples

Advantages of test pits

soil stratification easier to perform in situ tes rapid and cheaper

Uses Shelby tube

Undisturbed soil samples

a thin walled push tube sampler that obtains undisturbed samples of cohesive soil

Shelby Tube

May influence what can be built and will directly affect the design and construction procedure relating to how a structure is built

surface and subsurface features

Depth and number of boreholes, (footprint, area of the structure) and minimum required number of Boreholes

A<=1 50<A<=500=2 A>50=2+(A/100)

Other corrections

Borehole diameter correction, Drill rod length correction, Correction factor when using samplers with liners

Soil exploration

boring, sampling, testing

Penetration test in which A sleeves cone(diameter 35.7 mm, end area 1000 mm², Apex angel 60°) Is pushed into the ground at a rate of 20 mm/min. and the force required measured

Cone Penetration Test

Disadvantages of test pits

15 Feet depth max Requires shoring to prevent caving in Possibility of groundwater

Soil samples, who natural structure gets disturbed during the sampling process of soil

Disturbed soil samples

unless specified by the consulting Geo technical engineer all Baros should be drilled to adapt of at least __m into hard Strata or until a suitable bearing layer is rich

Soil samples that retain their natural structure and water content during the sampling process of soil

Undisturbed soil samples

Refers to drilling or advancing a hole into the ground

Boring

A borehole test that provides a measure of density of granular soils in the consistency of some clays. 2 inch diameter sampler is driven into the bottom of the bar hole by a 140 LBM hammer falling 30 inches. The number of blows required to drive the cylinder 12 inches is recorded

Standard Penetration Test

determining the nature of soil at the site and its stratification . Obtaining disturbed and undisturbed soil samples for visual identification and appropriate laboratory test determining the depth and nature of bedrock if encountered performing some in situ field test, Such as permeability test, venture test and standard penetration test observing drainage condition from and into the site. assessing any special construction problems with respect to the existing structures nearby. Determining the position of the water table

purpose of subsoil exploration

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