Consolidated undrained triaxial testing

In this test method, the shear characteristics are measured under drained conditions and are applicable to field conditions where soils have been fully consolidated under the existing normal stresses and the normal stress changes under drained conditions similar to those in the test method. The shear strength determined from this test method can be expressed in terms of effective stress because a strain rate or load application rate slow enough to allow pore pressure dissipation during shear is used to minimize excess pore pressure conditions. The shear strength may be applied to field conditions where full drainage can occur drained conditionsand the field stress conditions are similar to those in the test method. The shear strength determined from the test is commonly used in embankment stability analyses, earth pressure calculations, and foundation design.

Consolidated undrained triaxial testing

The group set of 16 stress paths shows a slight deviation in the Kf line, if any, which would usually be a sign of the existence of a preconsolidation stress. The deviation seems to be located around kPa.

1 Design of Retaining Wall and Support Systems for Deep Basement Construction – A Malaysian Experience Y. C. Tan & C. M. Chow G&P Geotechnics Sdn Bhd, Kuala Lumpur, Malaysia ( The apparatus used for cyclic triaxial strength tests is somehow similar to the conventional triaxial test equipment used for the unconsolidated-undrained triaxial compression test and the consolidated-undrained triaxial compression test. The main key differences are as follows. wo linear ball bushings or similar bearings used to guide the load rod to minimize friction and to maintain alignment. D Test Method for Unconsolidated-Undrained Triaxial Compression Test on Cohesive Soils D Practice for Minimum Requirements for Agencies Engaged in Testing and/or Inspection of Soil and Rock as Used in Engineering Design and Construction.

This point also coincides with a change in the shape of stress paths produced by the triaxial tests. The last 5 paths curve back on themselves at the failure line, which could be a result of pore pressure maintaining a positive gradient; this is a sign of a normally consolidated soil.

With further shearing, the pore pressures may have become negative. This suggests a slightly overconsolidated soil, with an OCR of around 2. The negative change in volume from the consolidation stage is assumed to be calibration error.

The B value of 0. The undrained shear strength of the soil appears to be related to the preconsolidation pressure applied to it. With increasing preconsolidation pressure, the strength seems to improve linearly until the pre-existing preconsolidation pressure is reached.

The friction angle of the soil appears to be around 30 degrees, which could be slightly high for a fine-grained soil. Choose Type of service.The test charges are effective from 1st January Written instructions or an appropriate purchase order are required before commencement of testing.

Shear strength is a term used in soil mechanics to describe the magnitude of the shear stress that a soil can sustain.

Effects of Clay and Moisture Content on Direct Shear Tests for Clay-Sand Mixtures

The shear resistance of soil is a result of friction and interlocking of particles, and possibly cementation or bonding at particle contacts. Analytical solution for undrained plane strain expansion of a cylindrical cavity in modified cam clay Vincenzo Silvestri and Ghassan Abou-Samra Abstract; Full Text (K) Abstract This paper presents the results of analytical and numerical analyses of the effects of performing a pressuremeter test or driving a pile in clay.

CONSOLIDATED UNDRAINED TRIAXIAL COMPRESSION TEST FOR UNDISTURBED SOILS TXDOT DESIGNATION: TEXE CONSTRUCTION DIVISION 3 – 10 LAST REVIEWED: SEPTEMBER 3. PREPARING SPECIMEN Specimens should have a minimum diameter of mm ( in.) The largest particle in the test specimen should be smaller than one-tenth of the.

The shear strength of a saturated soil in triaxial compression depends on the stresses applied, time of consolidation, strain rate, and the stress history experienced by the soil. In this test method, the shear characteristics are measured under undrained conditions and is applicable to field.

Consolidated undrained triaxial testing

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Consolidated undrained triaxial testing
Cyclic simple shear , Soil mechanics testing equipment, Controls