The influence of soil gravel content on compaction behaviour and pre-compression stress

Rücknagel, Jan; Götze, Philipp; Hofmann, B.; Christen, Olaf; Marschall, Karin

doi:10.1016/j.geoderma.2013.05.030

Cited by 70 publications

(26 citation statements)

References 20 publications

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“…Note: for soil matrix, the wet state corresponds to natural state, and for rock block, the wet state corresponds to saturation state. In this work, dynamic compaction was used for the preparation of the bimsoils pecimens [10][11][12]26,27].The appropriate optimal hammer count was determined according to the relationship between the hammer count and the soil matrix density Compaction was done in a split mould by applying a dynamic pressure, using a compaction test apparatus. Owing to the high difference of elastic modulus between soil matrix and rock block, compactness of bimsoil is actual the compactness of soil matrix.…”

Section: Materials and Sample Preparationmentioning

confidence: 99%

“…(a) Grain size distribution using sieving method for the used soil matrix; (b-d) Gravel, pebble and round rock blocks used in bimsoil specimen preparation, size range from 2 to 5 mm according to BS1377-1 (1990). In this work, dynamic compaction was used for the preparation of the bimsoils pecimens [10][11][12]26,27]. The appropriate optimal hammer count was determined according to the relationship between the hammer count and the soil matrix density Compaction was done in a split mould by applying a dynamic pressure, using a compaction test apparatus.…”

Section: Materials and Sample Preparationmentioning

confidence: 99%

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Optimization of Multiple Seepage Piping Parameters to Maximize the Critical Hydraulic Gradient in Bimsoils

Wang

et al. 2017

Water

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Seepage failure in the form of piping can strongly influence the stability of block-in-matrix-soils (bimsoils), as well as weaken and affect the performance of bimsoil structures. The multiple-factor evaluation and optimization play a crucial role in controlling the seepage failure in bimsoil. The aim of this study is to improve the ability to control the piping seepage failure in bimsoil. In this work, the response surface method (RSM) was employed to evaluate and optimize the multiple piping parameters to maximize the critical hydraulic gradient (CHG), in combination with experimental modeling based on a self-developed servo-controlled flow-erosion-stress coupled testing system. All of the studied specimens with rock block percentage (RBP) of 30%, 50%, and 70% were produced as a cylindrical shape (50 mm diameter and 100 mm height) by compaction tests. Four uncertain parameters, such as RBP, soil matrix density, confining pressure, and block morphology were used to fit an optimal response of the CHG. The sensitivity analysis reveals the influential order of the studied factors to CHG. It is found that RBP is the most sensitive factor, the CHG decreases with the increase of RBP, and CHG increases with the increase of confining pressure, soil matrix density, and block angularity.

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Section: Materials and Sample Preparationmentioning

confidence: 99%

Section: Materials and Sample Preparationmentioning

confidence: 99%

Optimization of Multiple Seepage Piping Parameters to Maximize the Critical Hydraulic Gradient in Bimsoils

Wang

et al. 2017

Water

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“…15C, D). Grav elly strata have a rel a tively low com pac tion po ten tial by com par i son with clays and a sig nif i cantly higher den sity than un com pacted clays (Garga and Madureira, 1985;Rücknagel et al, 2013). There fore, it may be ex pected that the mostly gravelly body load of FDS in the north ern Blatné de pres sion was an in flu ence on the com pac tion of the un der ly ing up per Mio cene strata.…”

Section: Base Level Fall Tectonic Movements and Causes Of Differentimentioning

confidence: 98%

Late Miocene fluvial distributary system in the northern Danube Basin (Pannonian Basin System): depositional processes, stratigraphic architecture and controlling factors of the Piešťany Member (Volkovce Formation)

Šujan¹,

Kováč²,

Hók³

et al. 2017

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M., Kováè, M., Hók, J., Šujan, M., Braucher, R., Rybár, S., de Leeuw, A., 2017. Late Mio cene flu vial distributary system in the north ern Dan ube Ba sin (Pannonian Ba sin Sys tem): depositional pro cesses, strati graphic ar chi tec ture and con trolling fac tors of the Piešïany Mem ber (Volkovce For ma tion). Geo log i cal Quar terly, 61 (3): 521-548, doi: 10.7306/gq.1360Aim of the study was to in ves ti gate the de tailed strati graphic ar chi tec ture of the al lu vial Volkovce For ma tion, which was de pos ited in the north ern Dan ube Ba sin dur ing the in ter val be tween 10 and 6 Ma. Two type lo cal ity ex po sures were sub ject to fa cies anal y sis and in ter pre ta tion of depositional pro cesses and >500 bore holes served for cor re la tion of spa tial vari abil ity in the char ac ter of the for ma tion. The study was fo cused on the north ern Blatné and west ern Rišòovce de pres sions, which are partly sep a rated by the Považský Inovec Moun tains horst. It was re vealed, that a mostly grav elly flu vial distributary system of the Piešïany Mem ber was de pos ited in the north ern Blatné de pres sion, partly con fined by the ex posed horst and by in cised palaeotopography. The se quence is com posed of amal gam ated braided river chan nel bod ies with no overbank strata, in re sponse to high sed i ment sup ply and low ac com mo da tion. The palaeo-stream then crossed the horst in its southern part to wards the Rišòovce de pres sion, where there was four times more ac com mo da tion. The sub merged horst acted as a bound ary, where the depositional pro cesses changed to a me an der ing river and sig nif i cant overbank de pos its started to be pre served. Only small streams were pres ent in the north ern Rišòovce de pres sion, which led to very low sed i ment sup ply com pared to the high ac com mo da tion there. The depositional sys tem was af fected mainly by the in cised palaeotopography, by the lo ca tion of sed i ment in put to gether with spa tial dif fer ences in ac com mo da tion rate caused by the ac tiv ity of the Ripòany Fault on the south east ern side of the Považský Inovec Mts.

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“…Many researchers [9][10][11]46,47] have adopted the hand mixing method for mixing rock blocks uniformly with the soil matrix. In order to ensure homogeneity of the samples, the rock blocks were mixed by hand into the soil for several minutes.…”

Section: Remolded Sample Preparationmentioning

confidence: 99%

Seepage Piping Evolution Characteristics in Bimsoils -An Experimental Study

Wang

Zhou

et al. 2017

Water

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Abstract:Piping is a kind of seepage failure mode that commonly occurs under the influence of seepage force in soil materials. Many studies have been done to study the characteristics of piping for soil materials, however, the initiation and development mechanism of piping in bimsoils is poorly understood. In this work, an experimental program was set for investigating the evolution process of piping, in a self-developed servo-controlled flow-erosion-stress coupled testing system. All the studied samples with rock block percentage (RBP) of 30%, 40%, 50%, 60%, and 70%, were produced as a cylindrical shape (50 mm diameter and 100 mm height) by compaction tests with different hammer strike counts to roughly insure the same void ratio. The results show that the amount of rock blocks in bimsoil samples significantly influenced the initiation and development of piping. Furthermore, the stress state has a crucial influence on the critical hydraulic gradient, seepage velocity, permeability, erosion, and migration of soil particles. Moreover, interactions among soil matrix, rock blocks, and rock-soil interfaces control the seepage stability of the bimsoil sample.

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The influence of soil gravel content on compaction behaviour and pre-compression stress

Cited by 70 publications

References 20 publications

Optimization of Multiple Seepage Piping Parameters to Maximize the Critical Hydraulic Gradient in Bimsoils

Optimization of Multiple Seepage Piping Parameters to Maximize the Critical Hydraulic Gradient in Bimsoils

Late Miocene fluvial distributary system in the northern Danube Basin (Pannonian Basin System): depositional processes, stratigraphic architecture and controlling factors of the Piešťany Member (Volkovce Formation)

Seepage Piping Evolution Characteristics in Bimsoils -An Experimental Study

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