Two identical saturated samples of clay (45 mm diameter and 90 mm long) have been extracted...

  

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Two identical saturated samples of clay (45 mm diameter and 90 mm long) have been extracted from the ground. The samples have been installed in triaxial apparatus without allowing drainage and a cell pressure of 300 kPa was applied. A back pressure of 200 kPa was set to the drainage taps opened. After leaving them for some time the samples eventually reached equilibrium with a total of 1.75 cm3 of water flowing into each sample. (A) CID: One sample was then subject to a standard drained test and the following measurements were recorded: 0 AF (N) 39 59 101 178 Ah (mm) 0 1 2 5 20 AV (cm³) 0 2.5 3.75 5.5 7.5 where AF, Ah, AV are respectively the changes in deviator load, axial displacement, and volume change occurring during shearing. 144 10 7.0 (B) CIU: The other sample was isotropically consolidated by raising the cell pressure to 400 kPa while maintaining a constant back pressure. Equilibrium was reached after 6.5 cm³ of water had flowed from the sample, and it was then subjected to a standard undrained test. The following measurements were recorded during the test: AF (N) 0 74 112 150 Ah (mm) 0 2 5 10 Au (kPa) 0 17 27 47 75 100 where AF, Ah, Au are respectively the changes in deviator load, axial displacement, and pore pressure. 49 1 181 20 The moisture content measured at the end of both tests was 35%. Assume that during the saturation and isotropic consolidation phases the strains occur uniformly in all directions. (That is, axial strain is equal to the radial strain.) • For each test produce a table showing values of axial strain , volumetric strain , pore pressure u, deviator stress q, specific volume v, and the total and effective mean stress p and p'. What was the initial moisture content of the clay? • Draw a single plot to show the total and effective stress path in q-p(p') space followed by the two samples. Two identical saturated samples of clay (45 mm diameter and 90 mm long) have been extracted from the ground. The samples have been installed in triaxial apparatus without allowing drainage and a cell pressure of 300 kPa was applied. A back pressure of 200 kPa was set to the drainage taps opened. After leaving them for some time the samples eventually reached equilibrium with a total of 1.75 cm3 of water flowing into each sample. (A) CID: One sample was then subject to a standard drained test and the following measurements were recorded: 0 AF (N) 39 59 101 178 Ah (mm) 0 1 2 5 20 AV (cm³) 0 2.5 3.75 5.5 7.5 where AF, Ah, AV are respectively the changes in deviator load, axial displacement, and volume change occurring during shearing. 144 10 7.0 (B) CIU: The other sample was isotropically consolidated by raising the cell pressure to 400 kPa while maintaining a constant back pressure. Equilibrium was reached after 6.5 cm³ of water had flowed from the sample, and it was then subjected to a standard undrained test. The following measurements were recorded during the test: AF (N) 0 74 112 150 Ah (mm) 0 2 5 10 Au (kPa) 0 17 27 47 75 100 where AF, Ah, Au are respectively the changes in deviator load, axial displacement, and pore pressure. 49 1 181 20 The moisture content measured at the end of both tests was 35%. Assume that during the saturation and isotropic consolidation phases the strains occur uniformly in all directions. (That is, axial strain is equal to the radial strain.) • For each test produce a table showing values of axial strain , volumetric strain , pore pressure u, deviator stress q, specific volume v, and the total and effective mean stress p and p'. What was the initial moisture content of the clay? • Draw a single plot to show the total and effective stress path in q-p(p') space followed by the two samples.

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T wo triaxial tests were performed on the same type of soil The tests were a ... View the full answer