2 edition of investigation of discrepancies in undrained shearing strength test results in clay found in the catalog.
investigation of discrepancies in undrained shearing strength test results in clay
F. A. De Lory
|Statement||by F. A. De Lory [and] R. J. Salvas.|
|Series||O.J.H.R.P. Report ;, no. 45|
|Contributions||Salvas, R. J., joint author.|
|LC Classifications||TE7 .O6 no. 45|
|The Physical Object|
|Number of Pages||64|
|LC Control Number||72476857|
This paper presents a Bayesian sequential updating (BSU) approach that integrates multi-source information obtained from geotechnical site investigation for probabilistic characterization of undrained shear strength s u of clay. Herein, the multi-source information includes the knowledge available prior to the project (namely prior knowledge) and test results from various testing procedures. Characterization of Undrained Shear Strength Profiles for Soft Clays at Six Sites in Texas 5. Report Date August ; Revised January 6. Performing Organization Code 7. Author(s) David A. Varathungarajan, Scott M. Garfield, Stephen G. Wright 8. Performing Organization Report No. 9. Performing Organization Name and Address.
Abstract. Conventional investigation methods such as standard penetration test and cone penetration test fail to identify weak deposits like soft clay, and designing the foundation without identifying the presence of such layer and its strength is : S. P. Raghu Prasanth, A. Arun Perumal, K. Ilamparuthi. Probe is discussed and the repeatability of test results is studied. Correlations are developed between Mackintosh Probe results and those of the Standard Penetration Test (SPT), as well as, undrained shear strength (c u). The study concludes that the application of the Mackintosh Probe for site investigation in soft deposits is appropriate.
F. A. De Lory has written: 'An investigation of discrepancies in undrained shearing strength test results in clay' -- subject(s): Clay, Shear strength of soils, Testing Asked in Math and Arithmetic. For an undrained shear test, a plot of normal stress versus shear stress will result in a horizontal line because clay particles cannot be forced closer together without the drainage of pore water. The undrained shear strength c u is commonly used in soil mechanics to characterize the strength of .
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Test data from unconsolidated-undrained (UU) and consolidated-undrained (CU) tests on tube samples of several saturated clays are compared, and the generally large discrepancies in undrained shear strength, S u, are analyzed in terms of changes in effective stress during the sampling by: The tests results: undrained shear strength (c u) and unconﬁ ned compression strength (q u) were discussed in the relation on in situ consoli-dation stress, Atterberg’s limits and the indicatory test – fall cone test results.
Key words: clay, heavily consolidated clay, un-drained shear strength, fall cone test, unconﬁ ned compression test. The undrained shear strength (su) is assumed equal to one-half of qu. The undrained strength as evaluated from the unconfined compression test often underestimates the in situ undrained strength of a saturated clay be cause of the effects of sample disturbance, dis continuities, and sand partings.
Estimating Undrained Strength of Clays from Direct Shear Testing at Fast Displacement Rates. When the direct shear test is performed in accordance with ASTM guidelines, the measured shear stresses at failure estimate drained strength parameters.
have been carried out using intact clay samples taken from great depths. The correlation between soil mechanic parameters is usually estimated on reconstituted samples or natural samples with OCR results of laboratory examinations of undrained shear strength File Size: KB. Ground surface settlement, pore water pressures, water content and the undrained shear strength of the clay soil were measured during vacuum preloading.
The test results indicated that short drains connected using embedded vacuum pipes and installed at close spacing were the most suitable method to form a working platform on the surface of the.
in Geotechnical engineering practice to use. the undrained shear strength to evaluate. the stability of a slope, or the bearing. capacity of a foundation, in the short term. the excess pore pressures, generated in the. soil as a result of the surcharge loads, are.
still high and have not had the time to. by: 1. Ho and Hsieh: Numerical Modeling for Undrained Shear Strength of Clays Subjected to Different Plasticity Indexes 93 based on critical state theory, as well as the MDP/Cap model were both employed in the finite element analyses.
The parame-ters analyzed based on the MCC model from the experimental results are also summarized in Tables 2 to Size: KB.
water content at different undrained shear strength. Dolinar  investigated the influence of mineralogical properties of soils on the values of both parameters in Eq.
(1), water content and undrained shear strength. On the basis of theoretical and experimental tests, she established that the undrained shear strength onlyFile Size: KB. The undrained strength of soft clays can be determined in a laboratory by vane shear test. The test can also be conducted in the field on the soil at the bottom of bore hole.
The apparatus consists of a vertical steel rod having four thin stainless steel blades or vanes fixed at its bottom end. accepted to deduce the drained shear strength of geomaterials, the undrained shear strength of soft clays remains a concern. The nature of shear strength saw considerable discrepancy at the Second International Conference of Soil Mechanics in At the conference the concept of “ File Size: 1MB.
The soil undrained shear strength can be evaluated from CPT on the basis of theoretical solutions using the bearing capacity equation [1, 2], cavity expansion theory , analytical and numerical methods , or strain path theory .Empirical relationships have been proposed by various authors for estimating the undrained shear strength of cohesive soils (S u) from the CPT cone Cited by: 3.
In soft clay, the undrained strength generally varies with depth 共 heterogeneity 兲, and with orientation of the shearing direc- tion 共 anisotropy 兲.
• Cohesion (Co) is a measure of the intermolecular forces. • Undrained shear strength (Su) is the shear strength of a soil when sheared at constant volume. • Apparent cohesion (C) is the apparent shear strength at zero normal effective stress.
Ansari Y, Pineda J, Kouretzis GP, Sheng D. Experimental and numerical investigation of rate and softening effects on the undrained shear strength of Ballina clay.
Australian Geomechanics 49 (4): Google by: 3. Black and Lister() published results of an investigation into the strength of clay fill subgrades and discussed relationships between CBR, moisture content, plasticity, suction and undrained shear strength of cohesive soils.
values of undrained shear strength can be very high (above kPa for heavily overconsolidated stiff clays, where significant horizontal effective stress is present). However, for soft clays that value will be below 20 kPa, and often just above zero.
The value of undrained shear strength will be also greatly affected by amount of water in soil. Evaluation of ground engineering properties (undrained shear strength, relative density, equivalent standard penetrations test values) may be derived from the measured data as mentioned above Piezo-cones (CPTu) can be used to measure the pore water pressure and to assess hydrostatic head, consolidation and permeability characteristics.
The InSitu Measurement of the Undrained Shear Strength of Clays Using. Comparison of Field Vane Results with Other InSitu Test Results. Vane Shear Strength Testing in Soils: Field and Laboratory Studies No preview available - to have shear strength of kN/m2 or very soft when the undrained shear strength is less than kPa.
Organics and peats are also classified into soft soils. These materials are classified into clay soils when the organic content is less than 25%, organic soils with 25 –.
The undrained strength of the London Clay is determined by the effective stress strength parameters applicable to the particular volume of clay and direction of shearing, and by the slope of the effective stress path, which is itself determined by the direction of shearing and the stiffness anisotropy in the by: In the undrained test, the development of porewater pressures has a strengthening effect due to an increase in the effective conﬁning pressure, and the specimen became stronger as strain increases.
Thus, failure occurs at a strain of 18%, 8% above the strain at which the specimen fails during drained shear.on undrained (total) shear strength parameters. The undrained shear strength (Su) of cohesive soils (clay and highly plastic silts) can be measured using unconfined compression (UC) tests, unconsolidated undrained (UU) triaxial tests, or consolidated undrained (CU) triaxial tests of undisturbed samples.