Cracking and vertical preferential flow through landfill clay liners

Li, Jinhui; Li, L.; Chen, Rui; Li, D.Q.

doi:10.1016/j.enggeo.2016.03.006

Cited by 121 publications

(41 citation statements)

References 35 publications

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“…The extent of such processes certainly depends on the variability of the hydraulic conductivity itself, as it is influenced by the statically and temporally variable hydrophobicity, connectivity, and interaction of the pore structure (Lamparter et al, 2006;Voelkner et al, 2015). An often-discussed topic is the self-healing potential (re-swelling) of shrinkage cracks, along with the initial shrinkage pathways during the wetting process (Li et al, 2016;Peng et al, 2007). Jasinska et al (2006) described the interaction between pre-drying and the occurrence of hydrophobic or hydrophilic behaviour within soil surfaces.…”

Section: Discussionmentioning

confidence: 99%

Compost quality and its function as a soil conditioner of recultivation layers – a critical review

Beck‐Broichsitter¹,

Fleige²,

Horn³

2018

International Agrophysics

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During a period of 4 years, soil chemical and physical properties of the temporary capping system in Rastorf (Northern Germany) were estimated, whereby compost was partly used as soil improver in the upper recultivation layer. The air capacity and the available water capacity of soil samples were first determined in 2013 (without compost), and then in 2015 (with compost) under laboratory conditions. Herein, the addition of compost had a positive effect on: the air capacity up to 13.4 cm3cm−3; and the available water capacity up to 20.1 cm3cm−3in 2015, in the recultivation layer (0-20 cm). However, taking into account the in situ results of the tensiometer and frequency domain reflectometry measurements, the addition of compost had a negative effect. The soil-compost mixture led to restricted remoistening even after a normal summer drying period in autumn and induced more negative matric potentials in the recultivation layer. In summary, the soil-improving effect of the compost addition, in conjunction with an increased water storage capacity, is undeniable and was demonstrated in a combined field and laboratory study. Therefore, intensive hydrophobicity can inhibit the homogeneous remoistening of the soil, resulting in a decreased hydraulic effectiveness of the sealing system.

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Section: Discussionmentioning

confidence: 99%

Compost quality and its function as a soil conditioner of recultivation layers – a critical review

Beck‐Broichsitter¹,

Fleige²,

Horn³

2018

International Agrophysics

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“…There were two valves between the Mariotte bottle and the rainfall simulator which were used to control the rainfall intensity. At the bottom of the simulator, there was a porous plate, simulating rainfall dropping from the rainfall simulator (Li et al, 2016). The simulator was connected with the sample container by two bolts.…”

Section: Methodsmentioning

confidence: 99%

“…It took more time for Bermuda soil to generate surface runoff than bare soil, which meant that the Bermuda grass root could reduce the infiltration capability of the bare soil. This may be because the presence of the Bermuda roots can restrict cracking of the soil (Li et al, 2016;Zhou et al, 2009). The rate of surface runoff in the Vetiver soil was the smallest.…”

Section: Surface Runoffmentioning

confidence: 97%

“…Under more realistic conditions the soil is usually unsaturated, which leads to significant difference in the hydraulic properties from that under saturated conditions (Fredlund and Rahardjo, 1993). Some laboratory studies have been conducted to measure the unsaturated hydraulic properties of the vegetated soil (Ng et al, 2014;Scanlan and Hinz, 2010;Li et al, 2016). The plants were usually grown in a container under well-controlled boundary conditions.…”

Section: Introductionmentioning

confidence: 99%

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Experimental study on unsaturated hydraulic properties of vegetated soil

Song

Zhou

et al. 2017

Ecological Engineering

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“…Summing up all influential factors, the suitability of mineral liner is superficially limited by shrinkage-crack formation, frost impact, or root penetration in conjunction with increasing Ks values of approximately three orders of magnitude [43], resulting in higher infiltration and leachate rates by a factor of 3 to 4 [44] due to preferential macropore flow, especially during intensive precipitation events [24].…”

Section: Suitability Of Marsh Clay and Boulder Marl As Mineral Linermentioning

confidence: 99%

Suitability of Boulder Marl and Marsh Clay as Sealing Substrates for Landfill Capping Systems—A Practical Comparison

2018

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The effects of compaction on soil shrinkage behavior need to be considered for engineering long-term durable mineral liners of landfill capping systems. For this purpose, a new three-dimensional laser scanning device was coupled with a mathematical-empirical model to simultaneously determine the shrinkage behavior of a boulder marl (bm) and a marsh clay (mc). Therefore, both materials were precompacted in 200 soil cores (100 cm 3 ) on the basis of the Proctor test results with five different degrees of compaction (bm1-bm5; mc1-mc5). Thus, the shrinkage behavior, intensity, and tendency were determined during a standardized drying experiment. The volume shrinkage index was used to describe the pore size dependent shrinkage tendency and was classified as high to very high (11.3-17.7%) for the marsh clay and medium (5.3-9.2%) for the boulder marl. Additionally, only the boulder marl (bm2), compacted up to 88% of Proctor density, could be installed as landfill bottom liner in drier locations if the local matric potentials did not exceed the previously highest observed drying range (i.e. values below −300 hPa), to avoid crack formation and generation.

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Cracking and vertical preferential flow through landfill clay liners

Cited by 121 publications

References 35 publications

Compost quality and its function as a soil conditioner of recultivation layers – a critical review

Compost quality and its function as a soil conditioner of recultivation layers – a critical review

Experimental study on unsaturated hydraulic properties of vegetated soil

Suitability of Boulder Marl and Marsh Clay as Sealing Substrates for Landfill Capping Systems—A Practical Comparison

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