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29 March 2017 1 Stresses in Soil Mass (Das, Chapter 10) Bed Rock Firm Ground Shallow Foundations - Transferring building loads to underlying ground - Mostly for firm soils or light loads

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Page 1: 10-Stresses in Soil Mass - CIVILITTEE :: الرئيسيةMicrosoft PowerPoint - 10-Stresses in Soil Mass [Compatibility Mode] Author hp Created Date 3/29/2017 9:30:07 AM

29 March 2017

1

Stresses in Soil Mass(Das, Chapter 10)

Bed Rock

Firm Ground

Shallow Foundations- Transferring building loads to underlying ground

- Mostly for firm soils or light loads

Page 2: 10-Stresses in Soil Mass - CIVILITTEE :: الرئيسيةMicrosoft PowerPoint - 10-Stresses in Soil Mass [Compatibility Mode] Author hp Created Date 3/29/2017 9:30:07 AM

29 March 2017

2

Bed Rock

Weak Soil

Deep Foundations

PILE

- Transferring building loads to underlying ground- Mostly for weak soils or heavy loads

Embankment

Page 3: 10-Stresses in Soil Mass - CIVILITTEE :: الرئيسيةMicrosoft PowerPoint - 10-Stresses in Soil Mass [Compatibility Mode] Author hp Created Date 3/29/2017 9:30:07 AM

29 March 2017

3

Stress in a Soil Mass Vertical stress due to a point load Vertical stress due to a vertical line load Vertical stress due to a vertical strip load Vertical stress due to embankment load Vertical stress below a center of a uniform loaded Circular area Vertical stress at any point below a uniformly loaded Circular area Vertical stress caused by rectangular load Influence chart for vertical pressure

Vertical Stress Due to a Point Load

Page 4: 10-Stresses in Soil Mass - CIVILITTEE :: الرئيسيةMicrosoft PowerPoint - 10-Stresses in Soil Mass [Compatibility Mode] Author hp Created Date 3/29/2017 9:30:07 AM

29 March 2017

4

Vertical Stress Due to a Point Load

Vertical Stress Due to a Vertical line Load

Page 5: 10-Stresses in Soil Mass - CIVILITTEE :: الرئيسيةMicrosoft PowerPoint - 10-Stresses in Soil Mass [Compatibility Mode] Author hp Created Date 3/29/2017 9:30:07 AM

29 March 2017

5

Vertical Stress Due to a Vertical Line Load

Vertical Stress Due to a Vertical Strip Load(Finite width and infinite length)

Calculate Dsz /q from 2z /B and 2x /B

Page 6: 10-Stresses in Soil Mass - CIVILITTEE :: الرئيسيةMicrosoft PowerPoint - 10-Stresses in Soil Mass [Compatibility Mode] Author hp Created Date 3/29/2017 9:30:07 AM

29 March 2017

6

Vertical Stress Due to a Vertical Strip Load

Vertical Stress Due to Embankment Loading

I2 is a function of B1/z and B2/z

Page 7: 10-Stresses in Soil Mass - CIVILITTEE :: الرئيسيةMicrosoft PowerPoint - 10-Stresses in Soil Mass [Compatibility Mode] Author hp Created Date 3/29/2017 9:30:07 AM

29 March 2017

7

Vertical Stress Due to Embankment Loading

Vertical Stress Below Center of Uniform Loaded Circular Area

D 2/312R/z

1 - 1 q zs

Page 8: 10-Stresses in Soil Mass - CIVILITTEE :: الرئيسيةMicrosoft PowerPoint - 10-Stresses in Soil Mass [Compatibility Mode] Author hp Created Date 3/29/2017 9:30:07 AM

29 March 2017

8

Vertical Stress Below Center of Uniform Loaded Circular Area

Vertical Stress at Any Point Below a Uniformly Loaded Circular Area

Page 9: 10-Stresses in Soil Mass - CIVILITTEE :: الرئيسيةMicrosoft PowerPoint - 10-Stresses in Soil Mass [Compatibility Mode] Author hp Created Date 3/29/2017 9:30:07 AM

29 March 2017

9

Vertical Stress at Any Point Below a Uniformly Loaded Circular Area

Vertical Stress at Any Point Below a Uniformly Loaded Circular Area

Page 10: 10-Stresses in Soil Mass - CIVILITTEE :: الرئيسيةMicrosoft PowerPoint - 10-Stresses in Soil Mass [Compatibility Mode] Author hp Created Date 3/29/2017 9:30:07 AM

29 March 2017

10

Vertical Stress Caused by Rectangular Load(under corner of the loading area)3Iq Ds

ZLZB

nm

I3 is a function of m and n

Vertical Stress Caused by Rectangular Load

Page 11: 10-Stresses in Soil Mass - CIVILITTEE :: الرئيسيةMicrosoft PowerPoint - 10-Stresses in Soil Mass [Compatibility Mode] Author hp Created Date 3/29/2017 9:30:07 AM

29 March 2017

11

21

Vertical Stress Caused by Rectangular Load

Vertical Stress Caused by Rectangular Load)III (Iq 2(4)2(3)2(2)2(1) D zs

1 2

3 4

Page 12: 10-Stresses in Soil Mass - CIVILITTEE :: الرئيسيةMicrosoft PowerPoint - 10-Stresses in Soil Mass [Compatibility Mode] Author hp Created Date 3/29/2017 9:30:07 AM

29 March 2017

12

Example 10.9

)I (Iq 2(2)2(1) D zs2

1

3 m 1 m

4 m

1 m

2 m

2 m

2 mA

A

A

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