simple shear of an undisturbed soft marine clay in ngi and

The marine soft clays have high water content and high sensitivity, which shows high compressibility and low strength. The installation of precast piles for wind turbines over soft marine clay will generate high excess pore water pressure (EPWP) with very low dissipation rate, resulting in low bearing capacity and large postconstruction

Critical cyclic stress ratio of undisturbed saturated soft clay in the

Jul 22, 2010The soil static and dynamic universal triaxial and torsional shear apparatus developed by Dalian University of Technology in China was employed to perform different types of tests on saturated soft marine clay in the Yangtze estuary. Undisturbed samples were subjected to undrained cyclic vertical and torsional coupling shear and cyclic

Simple Shear of an Undisturbed Soft Marine Clay in NGI and

Article Simple Shear of an Undisturbed Soft Marine Clay in NGI and Torsional Shear Equipment. A series of undrained, simple shear tests were performed on undisturbed, soft, marine clay from the continental slope of Israel in a direct simple shear dev

Minerals

The Piauiacute; laterite (NE Brazil) was initially evaluated for Ni but also contains economic concentrations of Co. Our investigations aimed to characterise the Co enrichment within the deposit; by understanding the mineralogy we can better design mineral processing to target Co recovery. The laterite is heterogeneous on the mineralogical and lithological scale differing

Experimental Investigation of Consolidated Undrained Shear

In addition, the average failure strain, εf, ranged from 9% to 15% for the investigated normally consolidated specimens, and the average effective angle of internal friction was 43.8, which is greater than the maximum internal friction angle of 35 for typical soft clay and silt soils. A correlation was proposed by curve fitting the experimental data to better capture the nonlinear

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Dynamically installed anchors for floating offshore wind turbines

It is the anchor in the soft clay (Clay 1), that has the lowest vertical capacity and receives the greatest vertical static load from pretension. It can be shown that the angle of the mooring line at the top of the anchor after a cross-tensioning of 2500 kN is approx. 55 o with a tension force of 1500 kN at the anchor i.e., a 40% reduction due to friction along the embedded chain.

Experimental simple shear study of composite soil with cemented

Abstract. Cement soil mixing piles are an effective treatment method for marine soft clay. To investigate the static and dynamic characteristics of the composite soil with cemented soil core, a series of experiments are carried out by using the cyclic simple shear test.

Md 98983

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Search Norwegian Geotechnical Institute: quartz

Norwegian Geotechnical Institute Feature. Has presentation (1)

Shear Strength Degradation Behavior of Offshore Clay Under

Feb 17, 2018Deformation characteristics of Malaysian offshore clay subjected to undrained cyclic constant-volume direct simple shear loading were investigated at different over-consolidation ratios and strain levels. Cyclic strain-controlled tests were undertaken with cyclic shear strain amplitudes ranging from 0.6% to 5%. As the number of cycles

A New p–y Curve for Laterally Loaded Large

15.11.2022In harsh offshore environmental conditions, the monopile foundations supporting offshore wind turbines must be designed for lateral loads such as winds, waves, and currents. The Beam on Nonlinear Winkler Foundation (BNWF) method has been widely used because of its clear concept and lower calculation cost. The selection of a reasonable pndash;y curve is

Quick clay landslides

Quick clay landslides. The picture above is from the quick clay slide in Kattmarka near Namsos in mid Norway, 13th March 2009. The whole area, about 250 m wide, with houses and dwellings slid out and were moved about 100 m to the sea. The slide was caused by blasting in connection with road work, seen in the far right of the picture.

NGI

NGI_ 2015_ Handbook the Q-system - Free download as PDF File (.pdf), Text File (.txt) or read online for free. 1963) and was intended to be used as a simple classification system for the stability of rock masses. Using the RQD-value, five rock classes are defined (A-E) as shown in Table 1. RQD was originally defined from drill cores as

Shear behavior of sensitive marine clay–steel interfaces

May 14, 2014Many soil–structure interaction problems require the knowledge of the shear resistance and behavior between the soil and construction materials. Although sensitive marine clay deposits are widely found in Canada (Leda clay) and many regions in the world (e.g., Scandinavia), and steel is a common construction material for many civil

Search shear resistance: sea water density

shear resistance Feature. Has presentation (1) Peer reviewed (3) SPE Disciplines. Highlight matches. Any in SPE Disciplines (9) Journal

Post

In offshore engineering, the soft marine clay beneath an embankment may be subjected to anisotropic consolidation stress paths, which greatly affect its monotonic and post-cyclic shear behavior. In this study, the post-cyclic undrained shear behavior of anisotropically consolidated soft marine clay was investigated by conducting a series of

Recommendations for future research

Threshold shear strain in cemented clayey soil: The 2% cemented kaolin sample conducted under a normal stress of 294 kPa and a shear-torque amplitude of 60 kPa did not show a failure state defined as cyclic shear displacement had reached a magnitude of 2 mm. This may lead to a subject of future investigation in relation to threshold shear strain in cemented clayey soil

Estimating coefficient of consolidation from piezocone tests

Data have been reviewed from sites in Europe and North and South America as well as published data from South Africa. The review has concentrated on dissipation data from piezocone tests (CPTU) to compare predicted coefficient of consolidation and permeability values using published interpretation techniques with available reference values.

Characterization and engineering properties of the NGTS

early 1960s, soft clay sites were developed for research purposes in the great Oslo region [1]. In the late 1960s there was a need for a ' homogenous soft clay deposit for testing shear box and field vane, and the first Onsy soft clay site was established [2]. The marine deposit at Onsy was found very

Shear strength variability analysis for design of on

Nearly 400 undrained shear strength data from minivane tests conducted on soft clay from 38 box core samples are evaluated for the presence of spatial correlation (autocorrelation) structure. Findings show a high degree of scatter and a lack of spatial correlation in both undisturbed and remolded shear strengths.

Interpretation of field and laboratory shear strength data of a soft

Aug 01, 1997Soft Muar Clay in Malaysia is of marine origin, and is characterized by a high water content that is close to or greater than its liquid limit. The variation of in situ vane shear strength is compared with various undrained laboratory tests conducted on undisturbed specimens recovered from different depths. The effects of the overburden

NGI

Dec 13, 2021Is there any way to use the NGI-ADPSoft in my current plaxis2d version? I would like to consider the strain softening behavior for both lightly over-consolidated and normally consolidated clay. Can I still use the OC-CLAY to calibrate the strain softening of NC or OC clay obtained from the direct simple shear test? Thank you. best regards, Jian

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Cyclic simple shear behavior of a tropical alluvial soil

2 A comparison with previous literature on cohesive soils shows that the tropical alluvial soil has a lower damping ratio and normalized shear modulus, which range from 3.3% to 9% and 0.0004 to 0.01, respectively. The findings indicate that the tropical alluvial soil has a potential reduction in strength when subjected to continuous cyclic loading.

A review on the geotechnical and engineering characteristics of marine

Dec 26, 2017Marine clay is a soft soil that could be found widely at the coastal and offshore areas. This type of soil is usually associated with high settlement and instability, poor soil properties that are not suitable for engineering requirements and low unconfined compressive strength of less than 20 kPa. Considerable failure could occur even with light loads and it

Evaluation of the Specimen Disturbance Effects in the

Jan 24, 2020Shi X, Lok TMH (2009) Experimental study of variation of shear wave velocity of Macao marine clay during one dimensional consolidation. Metro Design and Research Institute, China Railway Eryuan Engineering Group Co. Ltd. Shiwakoti DR, Tanaka H, Tanaka M, Mishima O (2000) A study on small strain shear modulus of undisturbed soft marine clays.

(PDF) Training Course in Geotechnical and Foundation

This manual was written to provide training on how to apply principles of geotechnical earthquake engineering to planning, design, and retrofit of highway facilities. Reproduced here are two chapters that deal with (1) ground motion characterization

Chapter 5

B. 2 Pier Foundation Consists of a cylindrical column of large diameter to support and transfer large loads Difference with pile is method of construction Pier foundation uses only bearing and has shallow depth When there is a close hard rock strata and stiff clay Types Masonry or Concrete Pier Drilled Pier CEng 3103 – Building Construction 5.1.4 Types of Foundation –

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Laboratory testing of undisturbed soft clay samples to determine

The NGI 54-mm Samplers for Undisturbed Sampling of Clays and Representative Sampling of Coarser Materials, Proc. of the Int. Conf. on Soil Sampling, Singapore, 1979, pp. 1-9. [2] BALDI G., HlGHT D.W., THOMAS G.E., State-of-the-Art: A Reevaluation of Conventional Triaxial Test Methods, Advanced Triaxial Testing of Soil and Rock, ASTM STP 977

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DEVELOPMENT OF A MULTI

5.9 Previous Testing on Gulf of Mexico Marine Clay .. 108 6. MULTI-DIRECTIONAL DIRECT SIMPLE SHEAR BEHAVIOR OF 2.5 Cambridge DSS device and NGI direct simple shear device (After Franke et al., 1979) .. 16 2.6 Comparisons of stress conditions in (a) triaxial and (b) simple shear test

Slope Stability Analysis

Slope stability analysis is an analytical tool for assessing the stability of a slope by using a simple failure model in analysis. This note is limited to slopes with homogenous material, soils or highly weathered, fractured rocks behaving like soils and for plain strain (2-D) problems only. Suction and reinforced slopes and rock slopes are not addressed. A few methods can be used in the

Post

Jul 06, 2008The post-cyclic undrained shear behaviour of clay or silty clay under cyclic loading has been the focus in recent years. Some considerable advances have been made. In the present research, cyclic tri-axial tests or simple shear tests on undisturbed or remolded samples are usually performed first.

SAMPLE DISTURBANCE EFFECTS IN SOFT LOW PLASTIC NORWEGIAN CLAY

The Sherbrooke block sampler has been used at several clay sites in Norway. Samples down to 22 m (72 ft) below ground level have successfully been obtained. Standard piston sampling with the 54 mm (2.12 in) NGI sampler have been obtained at the same sites. 75 mm (29.5 in) and 95 mm (27.4 in) piston samples have been obtained in some cases.

Post

Aug 19, 2021Post-Cyclic Mechanical Behaviors of Undisturbed Soft Clay with Different Degrees of Reconsolidation . by Yuan Lu. 1,2, Jian Chen. 1,2,3,4,5,6 Li et al. investigated the post-cyclic shear behavior of natural marine clay and found that the post-cyclic undrained peak strength of normally consolidated Wenzhou clay without reconsolidation

Example 3 (1967)

Fig.1 In situ shear device on location . The apparatus was in reality a gigantic self-boring sampling tube that trimmed out a vertical core of undisturbed clay, one meter in diameter, as it burrowed into the ground. When a shear test was desired the boring process could be stopped and the clay core within the device sheared in simple undrained

A simple bounding surface elasto

Download Citation | A simple bounding surface elasto-viscoplasticity model for marine clays under monotonic and cyclic loading | This paper develops a bounding surface elasto-viscoplasticity model