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1. Mechanism and estimation of the pockmarks in the subaqueous Yellow River delta | |||
LIU Hongjun,WANG Hu | |||
Earth Science 17 December 2013 | |||
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Abstract:The genesis mechanism and estimation method of pockmarks in the subaqueous Yellow River delta are investigated experimentally and theoretically, in which the wave-induced seepage is particularly considered. First of all, laboratory simulation tests were carried out to explore the response of silty seabed under cyclic loads, in which the layers and the saturation of seabed were considered. Excess pore pressure and seepage-related phenomenon was observed. The excess pore pressure was found to decrease more rapidly at the surface layer and the scale of seepage channels would be bigger with bigger amplitude of the cyclic loads and lower saturation of the underlying layer. In addition, the relationship between wave-induced seepage and pockmark was discussed, and the estimation of wave-induced seepage was proposed. Then, Mathematical model to simulate wave-induced excess pore pressure in the seabed was given. The model was then verified and corresponding parameters were calibrated by comparing with the laboratory tests results. Furthermore, the model was applied to the on-site Yellow River delta, in which different wave conditions and different stratifications of the seabed were considered. The genesis mechanism of pockmarks was summarized through the calculated results and the existing in-situ investigations. The wave-induced seepage in the seabed is a direct cause of the pockmarks in the subaqueous Yellow River delta; Extreme storm waves are necessary external factors; The surface hard layer and the underlying unsaturated weak layer would be certain internal factors; Scour and transport that caused by wave and current would be factors that contribute to the late reformation of the pockmarks in the subaqueous Yellow River delta. | |||
TO cite this article:LIU Hongjun,WANG Hu. Mechanism and estimation of the pockmarks in the subaqueous Yellow River delta[OL].[17 December 2013] http://en.paper.edu.cn/en_releasepaper/content/4574705 |
2. Impact of Electro-osmosis with Metal and Noble Electrode on Swelling properties of Bentonite | |||
ZHUANG Yanfeng,DUAN Wei,HUANG Yunlan,WANG Xiang,LIU Feifei,LI Ziyou,ZOU Weilie | |||
Earth Science 20 November 2013 | |||
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Abstract:Electro-osmosis may have impact on the swelling properties of bentonite. Electro-osmosis experiments using iron, black carbon and EKG electrodes were carried out. Result shows that electro-osmosis using iron electrodes may reduce swelling property of soil around anode but in crease that around cathode. Electro-osmosis using noble electrodes may increase swelling property of soil around both anode and cathode if the conductivity of electrodes is not very low. Electro-osmosis with different types of electrodes may have different impact of altering the crystal structure of clay minerals. Further research with purified clay minerals are recommended. | |||
TO cite this article:ZHUANG Yanfeng,DUAN Wei,HUANG Yunlan, et al. Impact of Electro-osmosis with Metal and Noble Electrode on Swelling properties of Bentonite[OL].[20 November 2013] http://en.paper.edu.cn/en_releasepaper/content/4570732 |
3. Electro-osmotic consolidation for hydraulic-filled sludge | |||
Yan-feng Zhuang,Yunlan Huang,Feifei Liu,Weilie Zou,Ziyou Li | |||
Earth Science 04 November 2013 | |||
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Abstract:Electro-osmotic consolidation is very efficient for fine-grained soil. Electrode corrosion and relative high energy consumption are two issues that to be tackled before E-dewatering method can be a popular method in the market that can compete with vacuume preloading. A novle EKG and novle electric power source system is presented together with a succesfull in-situ application. This innovation is inspiring enthusiasms now in China for research on E-dewatering. | |||
TO cite this article:Yan-feng Zhuang,Yunlan Huang,Feifei Liu, et al. Electro-osmotic consolidation for hydraulic-filled sludge[OL].[ 4 November 2013] http://en.paper.edu.cn/en_releasepaper/content/4566986 |
4. Shrinkage and cracking behaviour of swelling soil under different temperatures | |||
TANG Chaosheng | |||
Earth Science 06 January 2011 | |||
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Abstract:In this investigation, desiccation tests were conducted on two swelling soil slurries (Xiashu clay and Romainville clay) under different environmental temperature conditions. During drying, the water loss rate, volume shrinkage, initiation and propagation of desiccation cracks were monitored. By applying computer image processing technology, the geometric parameters of the crack pattern and the corresponding probability density functions (PDF) were determined. In addition, the surface crack ratio Rsc was introduced to quantify crack networks at different water contents. The results show that the soil water evaporation process is composed of two stages: a constant rate zone and a subsequent falling rate zone; higher water loss rate is accompanied by higher temperature; the cracking water content, crack length, width, aggregate area and their probability density functions increase with an increase of temperature; the Rsc increases evidently with a decrease of water content, and gradually tents to stabilization once the shrinkage limit (SL) is reached. The increase of Rsc is accompanied by the decrease of void ratio, and the cracking curve (Rsc versus water content) to some extent reflects the shrinkage properties of soil. During drying, most of the cracks developed before the air entry (AE) point where the soil specimen is still saturated. | |||
TO cite this article:TANG Chaosheng. Shrinkage and cracking behaviour of swelling soil under different temperatures[OL].[ 6 January 2011] http://en.paper.edu.cn/en_releasepaper/content/4404675 |
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