Nine-storey building foundation design

Contents

Introduction

1. Determination of soil name, determination of physical and mechanical characteristics of soils, assessment of soil conditions of the construction site

1.1. Determination of soil names as per GOST 25.100-

1.2. Determination of physical and mechanical characteristics of soils as per SNiP 2.02.01-

1.3. Table of physical and mechanical characteristics of construction site soils

1.4. Assessment of the ground conditions of the construction site. Selection of Foundation Option

2. Calculation and design of shallow foundations on natural foundation

2.1. Layout elevation

2.2. Depth of laying

2.3. Groundwater and its impact on the selection of the type of foundation structure

2.4. Determination of overall dimensions of foundations by design sections

2.5. Sizing Foundation Floor Graphically

2.6. Construction of shallow foundations

2.7. Calculation of sediment of foundation base of shallow foundation by layer-by-layer summation method

2.7.1. Definition of compressible thickness

2.7.2. Sum the precipitate of elementary layers

2.7.3. Comparison of design and limit deposits

2.8. Strength check of weak underlying layer

3. Calculation and design of pile foundations

3.1. Definition of pile foundation load combinations

3.2. Determining the Top and Bottom Elevations of the Pile Block

3.3. Type, method of immersion and selection of preliminary dimensions of pile

3.4. Determination of pile bearing capacity by soil

3.5. Determination of number of centrally loaded piles in foundation

3.6. Definition of the scheme of placement of piles in a grillage

3.7. Test calculation of pile foundation bearing capacity

3.8. Calibration calculation of pile foundation by II group of limit states

3.8.1. Check of pressure on the base of the conditional foundation

3.8.2. Determination of pile foundation settlement

3.9. Pile Foundation Design

3.10. Selection of equipment for pile diving, determination of control failure value

3.10.1. Hammer Type Selection

3.10.2. Hammer check by weight of the driven pile

3.10.3. Determination of control failure value

List of used literature

1. Determination of soil name, determination of physical and mechanical characteristics of soils, assessment of soil conditions of the construction site

1.1 Determination of soil names as per GOST 25100-95

1 layer - fill;

2 layer - dust-clay

Class - Disperse

Group - Connected

Subgroup - sedimentary

Type - mineral

View - clay

Variety by number of plasticity Ip

Ip = ¼ L - ¼ P = 0.21 - 0.15 = 0.06 (6%), = > slurry (1<Ip≤7)

Variety by flow index IL

IL = ([omega] - [omega] P )/( [omega] L - [omega] P) = (0.193 - 0.15 )/0.06 = 0.72, = > ductile (0<IL≤1)

Porosity factor e

е = ρs(1 + ω)/ρ – 1 = 2.69(1 + 0.193)/2.12 – 1 = 0.51

Plastic soup;

3 layer - sandy

Class - Disperse

Group - Disconnected

Subgroup - sedimentary

Type - mineral

View - Sands

Variety by size distribution

fine since particles d ≥ 0.1 mm occupy > 75% of the volume (79%)

Variety by water saturation coefficient Sr

е = ρs(1 + ω)/ρ – 1 = 2.64(1 + 0.258)/1,99 – 1 = 0.67

Sr = donbass s/e αw = 0,285 * 2.64/0.67 * 1 = 1.12 = > saturated with water (Sr > 1)

Variety by porosity coefficient e

e = 0.67 = > average density (0,6<e≤0.75)

Fine sand, saturated with water, medium density;

4 layer - dust-clay

Class - Disperse

Group - Connected

Subgroup - sedimentary

Type - mineral

View - clay

Variety by number of plasticity Ip

Ip = ¼ L - ¼ P = 0.42 - 0.23 = 0.19 (19%), = > clay (Ip > 17)

Variety by flow index IL

IL = ([omega] - [omega] P )/( [omega] L - [omega] P) = (0.26 - 0.23 )/0.19 = 0.16, = > semi-solid (0<IL≤0,25)

Porosity factor e

е = ρs(1 + ω)/ρ – 1 = 2.74(1 + 0.26)/1,97 – 1 = 0.75

The clay is semi-solid;

1.2 Determination of physical and mechanical characteristics of soils as per SNiP 2.02.01-83

1 layer - fill;

2 layer - plastic pulp IL = 0.72; e = 0.51

Standard value of specific adhesion s2 = 16.6 kPa,

Standard value of an angle of internal friction φ2 = 26.8o,

Standard value of deformation modulus E2 = 27.2 MPa;

3 layer - fine sand, saturated with water, average density e = 0.67

Standard value of specific adhesion c3 = 1.6 kPa,

The standard value of internal friction angle, which is, in the case of.... 3 = 31,2,

Standard value of deformation modulus E3 = 26 MPa;

4 layer - clay semi-solid IL = 0.16; e = 0.75

Standard value of specific adhesion c4 = 54 kPa,

Standard value of an angle of internal friction φ4 = 19o,

Standard value of deformation modulus E4 = 21 MPa;