Collapsing Soils Notes | EduRev

: Collapsing Soils Notes | EduRev

 Page 1


Module 8 : Foundations in difficult ground
Lecture 34 : Collapsing Soils [ Section 34.1 : Collapse potential measurement ]
   Objectives
   In this section you will learn the following
Collapse potential measurement
Page 2


Module 8 : Foundations in difficult ground
Lecture 34 : Collapsing Soils [ Section 34.1 : Collapse potential measurement ]
   Objectives
   In this section you will learn the following
Collapse potential measurement
Module 8 : Foundations in difficult ground
Lecture 34 : Collapsing Soils [ Section 34.1 : Collapse potential measurement ]
 
 
 Collapse potential measurement
 
Several researchers have proposed various methods for evaluating the physical parameters of collapsing soils
for identification.
Jennings and Knight (1975) suggested a procedure for describing the collapse potential of a soil: An
undisturbed soil specimen is taken at its natural moisture content and it is loaded up to 200  in
normal oedometer cell used for consolidation test. The void ratio is measured at this loading. Now the sample
is flooded with water and kept for 24 hrs. Again the void ratio is measured.
If the void ratios before and after flooding are e
1
 and e
2
 respectively, the collapse potential may be
calculated as
where, e
0
 is the natural void ratio of the soil.
  
Page 3


Module 8 : Foundations in difficult ground
Lecture 34 : Collapsing Soils [ Section 34.1 : Collapse potential measurement ]
   Objectives
   In this section you will learn the following
Collapse potential measurement
Module 8 : Foundations in difficult ground
Lecture 34 : Collapsing Soils [ Section 34.1 : Collapse potential measurement ]
 
 
 Collapse potential measurement
 
Several researchers have proposed various methods for evaluating the physical parameters of collapsing soils
for identification.
Jennings and Knight (1975) suggested a procedure for describing the collapse potential of a soil: An
undisturbed soil specimen is taken at its natural moisture content and it is loaded up to 200  in
normal oedometer cell used for consolidation test. The void ratio is measured at this loading. Now the sample
is flooded with water and kept for 24 hrs. Again the void ratio is measured.
If the void ratios before and after flooding are e
1
 and e
2
 respectively, the collapse potential may be
calculated as
where, e
0
 is the natural void ratio of the soil.
  
Module 8 : Foundations in difficult ground
Lecture 34 : Collapsing Soils [ Section 34.1 : Collapse potential measurement ]
  Recap
   In this section you have learnt the following.
Collapse potential measurement
Page 4


Module 8 : Foundations in difficult ground
Lecture 34 : Collapsing Soils [ Section 34.1 : Collapse potential measurement ]
   Objectives
   In this section you will learn the following
Collapse potential measurement
Module 8 : Foundations in difficult ground
Lecture 34 : Collapsing Soils [ Section 34.1 : Collapse potential measurement ]
 
 
 Collapse potential measurement
 
Several researchers have proposed various methods for evaluating the physical parameters of collapsing soils
for identification.
Jennings and Knight (1975) suggested a procedure for describing the collapse potential of a soil: An
undisturbed soil specimen is taken at its natural moisture content and it is loaded up to 200  in
normal oedometer cell used for consolidation test. The void ratio is measured at this loading. Now the sample
is flooded with water and kept for 24 hrs. Again the void ratio is measured.
If the void ratios before and after flooding are e
1
 and e
2
 respectively, the collapse potential may be
calculated as
where, e
0
 is the natural void ratio of the soil.
  
Module 8 : Foundations in difficult ground
Lecture 34 : Collapsing Soils [ Section 34.1 : Collapse potential measurement ]
  Recap
   In this section you have learnt the following.
Collapse potential measurement
Module 8 : Foundations in difficult ground
Lecture 34 : Collapsing Soils [ Section 34.2 : Corelation of collapse potential with foundation
problems ]
   Objectives
   In this section you will learn the following
Corelation of collapse potential with foundation problems
Page 5


Module 8 : Foundations in difficult ground
Lecture 34 : Collapsing Soils [ Section 34.1 : Collapse potential measurement ]
   Objectives
   In this section you will learn the following
Collapse potential measurement
Module 8 : Foundations in difficult ground
Lecture 34 : Collapsing Soils [ Section 34.1 : Collapse potential measurement ]
 
 
 Collapse potential measurement
 
Several researchers have proposed various methods for evaluating the physical parameters of collapsing soils
for identification.
Jennings and Knight (1975) suggested a procedure for describing the collapse potential of a soil: An
undisturbed soil specimen is taken at its natural moisture content and it is loaded up to 200  in
normal oedometer cell used for consolidation test. The void ratio is measured at this loading. Now the sample
is flooded with water and kept for 24 hrs. Again the void ratio is measured.
If the void ratios before and after flooding are e
1
 and e
2
 respectively, the collapse potential may be
calculated as
where, e
0
 is the natural void ratio of the soil.
  
Module 8 : Foundations in difficult ground
Lecture 34 : Collapsing Soils [ Section 34.1 : Collapse potential measurement ]
  Recap
   In this section you have learnt the following.
Collapse potential measurement
Module 8 : Foundations in difficult ground
Lecture 34 : Collapsing Soils [ Section 34.2 : Corelation of collapse potential with foundation
problems ]
   Objectives
   In this section you will learn the following
Corelation of collapse potential with foundation problems
Module 8 : Foundations in difficult ground
Lecture 34 : Collapsing Soils [ Section 34.2 : Corelation of collapse potential with foundation
problems ]
 
 
 
Corelation of collapse potential with foundation problems
 
The severity of foundation problems associated with a collapsible soil can be correlated with the collapse
potential C
p
 by Jennings and Knight (1975) which is summarized by Clemence and Finbarr (1981) and are
given in the following table.
 Table 8.1 : Relation of Collapse Potential to the severity of foundation problem
 (Clemence and Finbarr, 1981)
 
C
p
 (%) Severity of problem
0-1 No problem
1-5 Moderate trouble
5-10 Trouble
10-20 Severe trouble
20 Very severe trouble
  
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