SOIL MECHANICS AND FOUNDATION ENGINEERING-II (CE 311)

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Presentation transcript:

SOIL MECHANICS AND FOUNDATION ENGINEERING-II (CE 311)

Soil & Rock Property Evaluation Geotechnical Issues Engineering Evaluations Required Information for Analyses Field Testing Laboratory Testing Shallow Foundations bearing capacity settlement (magnitude & rate) shrink/swell of foundation soils (natural soils or embankment fill) chemical compatibility of soil and concrete frost heave scour (for water crossings) subsurface profile (soil, groundwater, rock) shear strength parameters compressibility parameters (including consolidation, shrink/swell potential, and elastic modulus) frost depth stress history (present and past vertical effective stresses) chemical composition of soil depth of seasonal moisture change unit weights geologic mapping including orientation and characteristics of rock discontinuities vane shear test SPT (granular soils) CPT dilatometer rock coring (RQD) nuclear density plate load testing geophysical testing 1-D Oedometer tests direct shear tests triaxial tests grain size distribution Atterberg Limits pH, resistivity tests moisture content unit weight organic content collapse/swell potential tests rock uniaxial compression test and intact rock modulus point load strength test

Geotechnical Issues Engineering Evaluations Required Information for Analyses Field Testing Laboratory Testing Driven Pile Foundations pile end-bearing pile skin friction settlement down-drag on pile lateral earth pressures chemical compatibility of soil and pile driveability presence of boulders/ very hard layers scour (for water crossings) vibration/heave damage to nearby structures extreme loading subsurface profile (soil, ground water, rock) shear strength parameters horizontal earth pressure coefficients interface friction parameters (soil and pile) compressibility parameters chemical composition of soil/rock unit weights presence of shrink/swell soils (limits skin friction) geologic mapping including orientation SPT (granular soils) pile load test CPT vane shear test dilatometer piezometers rock coring (RQD) geophysical testing triaxial tests interface friction tests grain size distribution 1-D Oedometer tests pH, resistivity tests Atterberg Limits organic content moisture content unit weight collapse/swell potential tests slake durability rock uniaxial compression test and intact rock modulus point load strength test

Geotechnical Issues Engineering Evaluations Required Information for Analyses Field Testing Laboratory Testing Embankments and Embankment Foundations settlement (magnitude & rate) bearing capacity slope stability lateral pressure internal stability borrow source evaluation (available quantity and quality of borrow soil) required reinforcement subsurface profile (soil, ground water, rock) compressibility parameters shear strength parameters unit weights time-rate consolidation parameters horizontal earth pressure coefficients interface friction parameters pullout resistance geologic mapping including orientation and characteristics of rock discontinuities shrink/swell/degradation of soil and rock fill nuclear density plate load test test fill CPT SPT (granular soils) dilatometer vane shear rock coring (RQD) geophysical testing 1-D Oedometer triaxial tests direct shear tests grain size distribution Atterberg Limits organic content moisture-density relationship hydraulic conductivity geosynthetic/soil testing shrink/swell slake durability unit weight

Geotechnical Issues Engineering Evaluations Required Information for Analyses Field Testing Laboratory Testing Excavations and Cut Slopes slope stability bottom heave liquefaction dewatering lateral pressure soil softening/progress ive failure pore pressures subsurface profile (soil, ground water, rock) shrink/swell properties unit weights hydraulic conductivity time-rate consolidation parameters shear strength of soil and rock (including discontinuities) geologic mapping including orientation and characteristics of rock discontinuities test cut to evaluate stand-up time piezometers CPT SPT (granular soils) vane shear dilatometer rock coring (RQD) in situ rock direct shear test geophysical testing hydraulic conductivity grain size distribution Atterberg Limits triaxial tests direct shear tests moisture content slake durability rock uniaxial compression test and intact rock modulus point load strength test

Geotechnical Issues Engineering Evaluations Required Information for Analyses Field Testing Laboratory Testing Reinforced Soil Slopes internal stability external stability settlement horizontal deformation lateral earth pressures bearing capacity chemical compatibility with soil and wall materials pore pressures behind wall borrow source evaluation (available quantity and quality of borrow soil) subsurface profile (soil, ground water, rock) horizontal earth pressure coefficients interface shear strengths foundation soil/wall fill shear strengths compressibility parameters (including consolidation, shrink/swell potential, and elastic modulus) chemical composition of fill/ foundation soils hydraulic conductivity of soils directly behind wall time-rate consolidation parameters geologic mapping including orientation and characteristics of rock discontinuities SPT (granular soils) CPT dilatometer vane shear piezometers test fill nuclear density pullout test rock coring (RQD) geophysical testing 1-D Oedometer triaxial tests direct shear tests grain size distribution Atterberg Limits pH, resistivity tests moisture content organic content moisture-density relationships hydraulic conductivity