Measurement of Static and Dynamic Soil Stress and Strain using In-ground Instrumentation

Miller, Patrick K.; Rinehart, Robert V.; Mooney, Michael A.

doi:10.1061/40904(223)13

Cited by 8 publications

(5 citation statements)

References 3 publications

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“…That is due to the Loadman's measuring principle: it cannot measure deeper soil layers. Miller et al (2007) found that the Loadman can measure only to a depth of about 20 cm from the surface. It seems that the Loadman is quite unreliable if deeper layers need to be studied.…”

Section: Discussionmentioning

confidence: 99%

Applicability of portable tools in assessing the bearing capacity of forest roads

Kaakkurivaara¹,

Vuorimies²,

Kolisoja³

et al. 2015

Silva Fenn.

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Applicability of portable tools in assessing the bearing capacity of forest roadsKaakkurivaara T., Vuorimies N., Kolisoja P., Uusitalo J. (2015). Applicability of portable tools in assessing the bearing capacity of forest roads. Silva Fennica vol. 49 no. 2 article id 1239. 26 p. Highlights• The dynamic cone penetrometer (DCP) and light falling weight deflectometer (LFWD) are useful tools for measuring bearing capacity.• The measurement results are not same as with the falling weight deflectometer (FWD), but comparable. AbstractForest roads provide access to logging sites and enable transportation of timber from forest to mills. Efficient forest management and forest industry are impossible without a proper forest road network. The bearing capacity of forest roads varies significantly by weather conditions and seasons since they are generally made of poor materials and the constructed layers may be mixed with subgrade. A bearing capacity assessment is valuable information when trafficability is uncertain and rutting is obvious. In this study, bearing capacity measurements were carried out using the light falling weight deflectometer (LFWD), the dynamic cone penetrometer (DCP) and the conventional falling weight deflectometer (FWD). The aim was to compare their measurement results in relation to road characteristics and moisture conditions. Data were collected from 35 test road sections in four consecutive springs and during one summer. The test road sections had measurement points both on the wheel path and the centre line. The data show logical correlations between measured quantities, and the study presents reliable regression models between measuring devices. The results indicate that light portable tools, the DCP and the LFWD, can in most cases be used instead of the expensive falling weight deflectometer on forest roads.

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Section: Discussionmentioning

confidence: 99%

Applicability of portable tools in assessing the bearing capacity of forest roads

Kaakkurivaara¹,

Vuorimies²,

Kolisoja³

et al. 2015

Silva Fenn.

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“…This is presumably caused by the properties of litter (surface layer) changing due to the falling weight. Litter thickness was approximately 4 cm, and if the capacity of deflectometer is to measure into a depth of ca 1.5 multiple of reaction area (Miller et al 2007) it is very significant with respect to the measured profile. Nevertheless, the authors do not condemn the measurement with litter.…”

Section: Discussionmentioning

confidence: 99%

“…They concluded that portable deflectometers are the right choice to measure the compaction of individual road base structures from many aspects, namely due to their easy handling and expeditious data acquisition. Miller et al (2007) analyzed the depth to which stress effects can be detected. They established that the stress in lightweight PFWD (stress effect) could be measured at a depth which is 1 to 1.5 times the base plate diameter.…”

mentioning

confidence: 99%

Possibilities of using the portable falling weight deflectometer to measure the bearing capacity and compaction of forest soils

Klvac¹,

Vrána²,

Jiroušek³

2010

J. For. Sci.

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ABSTRACT:The paper discusses possibilities of using the portable falling weight deflectometer to measure the bearing capacity and compaction of forest soils. Within the study, measurements were made using manual penetrometer and Loadman II portable falling weight deflectometer. To eliminate the extreme values, Grubbs's test was used. The results indicate that Loadman II deflectometer may be used to measure both the bearing capacity and compaction of forest soils under the canopy as well as in transport lines. A significant difference was found between deflection of waterunaffected sites and water-affected sites (12.08 and 2.31 mm, respectively). Measurements of bearing capacity after removal of forest litter give far more precise details; however, the authors do not refuse the measurements without litter removal, either. To determine the degrees of soil compaction, it is useful to measure the soil reaction time; to measure the bearing capacity it is vital to measure deflection.

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“…The EPCs were calibrated in the lab using the equipment and procedures recommended by Theroux et al (2001) and Labuz & Theroux (2005). The placement and efficacy of the sensors, as well as the preparation of test beds is described in detail elsewhere Miller et al, 2007). showed that the resolution uncertainty of the EPCs was 0 .…”

Section: Field Test Bedsmentioning

confidence: 99%

Measurement depth of vibratory roller-measured soil stiffness

Mooney¹

2009

Géotechnique

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This paper presents the results of an experimental and analytical study conducted to assess the measurement depth and volume of vibratory roller-measured soil stiffness. Test beds were constructed in lifts with controlled thickness and instrumented with stress and strain sensors. A composite assessment of roller-measured stiffness on individual lifts throughout construction revealed that measurement depths ranged from 0·9 to 1·2 m using two common-sized vibratory rollers. For overlying material layer thickness greater than the measurement depth, roller-measured stiffness was found to be a function of the overlying material only. Otherwise, roller stiffness was a function of the two materials. Measurement depth was not significantly influenced by the layer material stiffness ratio. The sensitivity of roller-measured stiffness to thin lifts of material (e.g. 0·2 m) was found to depend on the stiffness ratio of the two materials. Data from in-ground instrumentation supported by elastic theory revealed that, at the experimentally observed measurement depths, both the total and cyclic stress and strain were approximately 10% of their maximum values. An analysis of cyclic strain profiles from three different soils revealed that the measurement depth is weakly dependent on excitation force amplitude. For the two rollers used, measurement depth ranged from 0·8 m under low excitation force to 1·2 m under high excitation force.

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Measurement of Static and Dynamic Soil Stress and Strain using In-ground Instrumentation

Cited by 8 publications

References 3 publications

Applicability of portable tools in assessing the bearing capacity of forest roads

Applicability of portable tools in assessing the bearing capacity of forest roads

Possibilities of using the portable falling weight deflectometer to measure the bearing capacity and compaction of forest soils

Measurement depth of vibratory roller-measured soil stiffness

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