Excess pore pressure and grain crushing of sands by means of undrained and naturally drained ring-shear tests

Okada, Yasuhiko; Sassa, Kyoji; Fukuoka, Hiroshi

doi:10.1016/j.enggeo.2004.07.001

Cited by 106 publications

(54 citation statements)

References 23 publications

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“…: detrimental clogging and formation damage near petroleum wells [12], permeability losses around perforations [10,31], impaired fluid conduction owing to particle crushing in locations adjacent to testing penetrometers and friction fatigue around piles [42], and crushing-induced instability transitions in highly stressed soil masses adjacent to or located within geotechnical structures, for instance filters for large dams [19]. [44] and [35] have discussed the effect of soil crushing on pile end bearing capacity while, more recently [22] examined the effect of particle crushing on the capacity of driven piles; Zheghal [45] studied the role of grain crushing in road construction; [29] reported that grain crushing within the failure zone is responsible for the rapid long run-out motion of landslides and sturzstroms, as observed in physical experiments in a geotechnical drum centrifuge by [16].…”

Section: Introductionmentioning

confidence: 99%

Breakage of an artificial crushable material under loading

2013

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The mechanical behaviour of granular materials depends on their grading. Crushing of particles under compression or shear modifies the grain size distribution, with a tendency for the percentage of fine material to increase. It follows that the frictional properties of the material and the critical states are modified as a consequence of the changes in grain size distribution and the available range of packing densities. This paper illustrates an extended experimental investigation of the evolution of the grading of an artificial granular material, consisting of crushed expanded clay pellets under different loading conditions. The changes of grading of the material after isotropic, one-dimensional and constant mean effective stress triaxial compression were described using a single parameter based on the ratio of the areas under the current and an ultimate cumulative particle size distribution, which were both assumed to be consistent with self similar grading with varying fractal dimension. Relative breakage was related to the total work input for unit of volume. For poorly graded samples, the observed maximum rate of breakage is practically independent of initial uniformity. Further

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Section: Introductionmentioning

confidence: 99%

Breakage of an artificial crushable material under loading

2013

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“…정적 및 동적 재 하방법에 따라 링전단시험장치는 강우에 기인한 산사태와 지진에 기인한 산사태로 구분되며 지상과 해저환경에서 발 생하는 산사태에 대해 포괄적인 산사태 연구가 수행되고 있 다 (Sassa, 2000;Sassa et al, 2012). 이러한 링전단시험장 치는 산사태 발생시점에서 토석류 흐름까지 전주기적으로 발생하는 입자-입자 간 변형특성을 조사할 수 있는 장점을 가지고 있다 (Okada et al, 2004;Wang et al, 2002;Wafid et al, 2004;Fukuoka et al, 2006Fukuoka et al, , 2007Li et al, 2013). …”

Section: 일본 교토대학교 방재연구팀(Disaster Prevention Researchunclassified

Ring Shear Characteristics of Waste Rock Materials in Terms of Water Leakage

Jeong¹

2016

The Journal of Engineering Geology

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주요어: 링전단시험장치, 비배수전단강도, 누수, 변형률 경화 거동, 변형률 연화 거동Shear characteristics of soils can be investigated using various types of shear stress measuring apparatus. Ring shear tests are often applied for examining the residual shear strength under the unlimited deformation. This paper presents drainage-consolidation-shear velocity dependent undrained shear strengths measured in terms of water leakage. A series of ring shear tests were performed under the constant normal stress (50 kPa) and controled shear velocity ranging from 0.01~1 mm/sec under the undrained condition. As a result, undrained shear strengths are dependent on shear velocity. It exhibits that straining hardening behavior is observed for the shear velocity lower than 0.1 mm/sec; however, the strain softening behavior is observed for the shear velocity higher than 0.1 mm/sec. Water leakage can cause the increase in shear stress irrespective of shear velocity. Shear stress increases with increasing amount of water leakage. It is due to the fact that the small grains and water flow out through the rubble edge in the ring shear box. Repetitive saturation and consolidation processes may minimize the error.

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“…7. The existing literature has reported that the permeability of granitic soil samples that contain feldspar after ring-shearing is relatively lower, and particle breakage in such samples is comparatively higher than that in quartz samples at 0.5 MPa [15] and is in the range of 25-100 MPa [13]. Table 2.…”

Section: Permeability and Porosity Reduction Versus Effective Normal mentioning

confidence: 99%

“…Several studies used a ring-shear apparatus with large-displacement shearing to measure permeability evolution [11][12][13][14][15][16], because a ring-shear device can shear a specimen with a large displacement that is similar to natural faults with the same direction of movement for the mobile half of the specimen relative to the stationary half [17][18][19][20][21][22][23][24]. Previous studies found that permeability evolution due to particle crushing is related to porosity reduction [11][12][13][14][15][16]. However, these studies have not completely clarified the relationship between permeability and effective normal stress after large-displacement ring-shearing under overburden pressure, which is less than approximately 10 MPa, in methane hydrate reservoir zones.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Fault Permeability in Sands with Different Mineral Compositions (Evaluation of Gas Hydrate Reservoir)

et al. 2015

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Abstract:We used a ring-shear apparatus to examine the perpendicular permeability of sands with different mineral compositions to evaluate fault behavior around gas hydrate reservoirs. The effect of effective normal stress on the permeability of two sand types was investigated under constant effective normal stresses of 0.5-8.0 MPa. Although Toyoura sand and silica sand No. 7 mainly comprise quartz, silica sand No. 7 contains small amounts of feldspar. For Toyoura sand, the permeability after ring-shearing dramatically decreased with increasing effective normal stress up to 3.0 MPa, then gradually decreased for stresses over 3.0 MPa, whereas the permeability after ring-shearing of silica sand No. 7 rapidly decreased with increasing effective normal stress up to 2.0 MPa. Although the relationships between the permeability after ring-shearing and effective normal stress for both sands could be expressed by exponential equations up to 3.0 MPa, a more gradual change in slope was shown for Toyoura sand. The permeabilities of both sands were almost equal for effective normal stresses over 3.0 MPa. The mineralogical properties of the small amount of feldspar in the sample indicate that both mineralogy and original grain size distribution affect the fault permeability and shear zone formation. OPEN ACCESSEnergies 2015, 8 7203

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Excess pore pressure and grain crushing of sands by means of undrained and naturally drained ring-shear tests

Cited by 106 publications

References 23 publications

Breakage of an artificial crushable material under loading

Breakage of an artificial crushable material under loading

Ring Shear Characteristics of Waste Rock Materials in Terms of Water Leakage

Investigation of Fault Permeability in Sands with Different Mineral Compositions (Evaluation of Gas Hydrate Reservoir)

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