Undrained Triaxial Test

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  • Topic: Geotechnical engineering, Soil mechanics, Tensile stress
  • Pages : 6 (1257 words )
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  • Published : May 12, 2013
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SCHOOL OF CIVIL ENGINEERING AND CONSTRUCTION

FACULTY OF SCIENCE, ENGINEERING & COMPUTING

Geotechnical Engineering 1

LEVEL: 5MODULE: CE2045

Quick Un-Drained Triaxial Test

Report Author: Keith

GROUP MEMBERS:Ahmed Ahmed K1034749
Villamar Rodriguez K0916719

DATE OF EXPERIMENT: 4 February 2013

* Table of Contents Page
*
1Introduction and Objectives2
2Experimental Results7
2.1Raw Results7
2.2Graph8
2.3Final Results9
3Analysis and Discussion10
3.1Meaning of Results10
4Conclusion11
5References12
6Appendices13

Introduction & objectives

The Tri-Axial test is a widely practiced laboratory method commonly used for testing the shear strength parameters of different soil types under drained or un-drained conditions.

The Tri-axial test involves applying radial and axial stresses or displacements to a cylindrical sample of soil obtained from a particular site. The soil sample is enclosed in a thin rubber membrane and setup vertically between two rigid ends in the pressure chamber, which is then filled with de-aired water and then the axial stress applied gradually digitally.

The pressure within the chamber is controlled by the de-aired water surrounding the sample. The stress capacity of the soil sample within the chamber increases as cell pressure increases.

The volume change in the soil sample is also controlled by measuring the volume of moving water within the chamber.

There are three main types of tri-axial tests that can be carried out on soil samples, depending on the drainage conditions and loading:

Consolidated – Drained (CD)
Consolidated – Undrained (CU)
Unconsolidated - Undrained (UU)

The purpose of carrying out an Undrained tri-axial test is to determine the properties of different types of soils under varying strains and stresses. It is carried out to get a better understand of the behavior of compacted saturated or partially saturated soil types. This in turn will help give a better understanding of the ground at the particular site where the sample was obtained from and help designers decide on the type of foundation to be laid for a proposed structure erection.

Experimental Results

2.1Raw Results
| 100KN/m| 200KN/m| 400KN/m|
Axial Strain %| Corrected stress KN/m| Corrected stress KN/m| Corrected stress KN/m| 0| 0| 0| 0|
0.26| 1.3| 10.28| 3.89|
0.53| 3.88| 9.18| 4.53|
0.79| 20.64| 8.08| 52.9|
1.05| 29.6| 6.98| 57.27|
1.32| 34.01| 30.53| 59.68|
1.58| 40.96| 53.95| 82.56|
1.84| 45.96| 66.59| 111.7|
2.11| 48.38| 74.91| 124.77|
2.37| 52.7| 81.6| 134.6|
2.63| 56.35| 8.88| 146.9|
2.89| 60.62| 96.44| 159.13|
3.16| 66.75| 104.06| 171.29|
3.42| 71.6| 111.64| 182.76|
3.68| 75.79| 120.23| 194.16|
3.95| 79.33| 128.24| 205.5|
4.21| 84.09| 135.16| 217.39|
4.47| 87.59| 143.61| 229.22|
4.74| 91.68| 152.52| 243.46|
5| 96.37| 160.34| 254.52|
5.26| 101.03| 168.64| 266.14|
5.92| 111.34| 192.49| 309.56|
6.58| 125.75| 205.34| 352.96|
7.24| 144.17| 225.54| 397.53|
7.89| 159.32| 246.43| 439.63|
8.55| 170.67| 276.44| 482.87|
9.21| 183.61| 296.13| 529.58|
9.87| 201.62| 318.44| 567.36|
10.53| 217.61| 340.4| 609.76|
11.18| 229.29| 358.62| 645.13|
11.84| 236.76| 378.45| 677.62|
12.5| 241.93| 391.77| 705.56|
13.16| 249.61| 406.74| 735.27|
13.82| 260.61| 423.3| 758.28|
14.47| 269.74| 438.63| 776.96|
15.13| 276.5| 453.22| 791.41|
15.79| 282.57| 461.59| 800.61|
16.45| 291.23| 470.68| 802.59|
17.11| 298.1| 478.22| 805.35|
17.76| 304.29| 489.6| 803.23|
18.42| 303.44| 501.18| 799.46|
19.08| 301| 502.85| 787.22|
19.74| 301.68| 503.12| 782.91|
20.39| 302.83| 505.91| 767.18|
21.05|...
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