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 troubleRead More

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