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A platform for research: civil engineering, architecture and urbanism
Studies on hydraulic conductivity and compressibility of backfills for soil-bentonite cutoff walls
https://orcid.org/0000-0002-2907-6020
https://orcid.org/0000-0002-3312-0573
AbstractFujian standard sand (Sand-F) was used to simulate a sandy soil layer. Hebei bentonite (Bent-H) and Jiangning clay (Clay-J) were served as additives for studying the hydraulic conductivity and compressibility of sand-bentonite/clay mixture backfills. The results indicate that there is an optimum mixing content (Copt) when Bent-H or Clay-J is mixed with the Sand-F. If the content of bentonite/clay is less than Copt, hydraulic conductivity k>1.0×10−7cm/s and porosity and coefficient of compressibility decrease with the increase of the content of bentonite/clay. While the content of bentonite/clay are greater than Copt, hydraulic conductivity k≤1.0×10−7cm/s and porosity and coefficient of compressibility increase with the increase of the content of bentonite/clay. As the content of bentonite/clay is less than Copt, clay minerals only fill the sand pore space without influencing the sand skeleton and porosity decreases with the increase of the content of bentonite/clay. While the content of bentonite/clay becomes greater than Copt, sand particles become disconnected and porosity increases with the increase of the content of bentonite/clay. A porosity model of sand-bentonite/clay mixtures was derived based on a micro-geometrical principle. Another equation was also developed to calculate hydraulic conductivity values with the changes of the content of bentonite/clay.
HighlightsHydraulic conductivity and compressibility of sand-bentonite/clay backfill materials.An optimum mixing content was found for the sand-bentonite/clay backfill materials.A porosity model of backfills was derived based on a micro-geometrical principle.An equation was developed to estimate the hydraulic conductivity of the backfills.
Studies on hydraulic conductivity and compressibility of backfills for soil-bentonite cutoff walls
https://orcid.org/0000-0002-2907-6020
https://orcid.org/0000-0002-3312-0573
AbstractFujian standard sand (Sand-F) was used to simulate a sandy soil layer. Hebei bentonite (Bent-H) and Jiangning clay (Clay-J) were served as additives for studying the hydraulic conductivity and compressibility of sand-bentonite/clay mixture backfills. The results indicate that there is an optimum mixing content (Copt) when Bent-H or Clay-J is mixed with the Sand-F. If the content of bentonite/clay is less than Copt, hydraulic conductivity k>1.0×10−7cm/s and porosity and coefficient of compressibility decrease with the increase of the content of bentonite/clay. While the content of bentonite/clay are greater than Copt, hydraulic conductivity k≤1.0×10−7cm/s and porosity and coefficient of compressibility increase with the increase of the content of bentonite/clay. As the content of bentonite/clay is less than Copt, clay minerals only fill the sand pore space without influencing the sand skeleton and porosity decreases with the increase of the content of bentonite/clay. While the content of bentonite/clay becomes greater than Copt, sand particles become disconnected and porosity increases with the increase of the content of bentonite/clay. A porosity model of sand-bentonite/clay mixtures was derived based on a micro-geometrical principle. Another equation was also developed to calculate hydraulic conductivity values with the changes of the content of bentonite/clay.
HighlightsHydraulic conductivity and compressibility of sand-bentonite/clay backfill materials.An optimum mixing content was found for the sand-bentonite/clay backfill materials.A porosity model of backfills was derived based on a micro-geometrical principle.An equation was developed to estimate the hydraulic conductivity of the backfills.
Studies on hydraulic conductivity and compressibility of backfills for soil-bentonite cutoff walls
https://orcid.org/0000-0002-2907-6020
https://orcid.org/0000-0002-3312-0573
AbstractFujian standard sand (Sand-F) was used to simulate a sandy soil layer. Hebei bentonite (Bent-H) and Jiangning clay (Clay-J) were served as additives for studying the hydraulic conductivity and compressibility of sand-bentonite/clay mixture backfills. The results indicate that there is an optimum mixing content (Copt) when Bent-H or Clay-J is mixed with the Sand-F. If the content of bentonite/clay is less than Copt, hydraulic conductivity k>1.0×10−7cm/s and porosity and coefficient of compressibility decrease with the increase of the content of bentonite/clay. While the content of bentonite/clay are greater than Copt, hydraulic conductivity k≤1.0×10−7cm/s and porosity and coefficient of compressibility increase with the increase of the content of bentonite/clay. As the content of bentonite/clay is less than Copt, clay minerals only fill the sand pore space without influencing the sand skeleton and porosity decreases with the increase of the content of bentonite/clay. While the content of bentonite/clay becomes greater than Copt, sand particles become disconnected and porosity increases with the increase of the content of bentonite/clay. A porosity model of sand-bentonite/clay mixtures was derived based on a micro-geometrical principle. Another equation was also developed to calculate hydraulic conductivity values with the changes of the content of bentonite/clay.
HighlightsHydraulic conductivity and compressibility of sand-bentonite/clay backfill materials.An optimum mixing content was found for the sand-bentonite/clay backfill materials.A porosity model of backfills was derived based on a micro-geometrical principle.An equation was developed to estimate the hydraulic conductivity of the backfills.
Studies on hydraulic conductivity and compressibility of backfills for soil-bentonite cutoff walls
Xu, Haoqing (author) / Zhu, Wei (author) / Qian, Xuede (author) / Wang, Shengwei (author) / Fan, Xihui (author)
Applied Clay Science ; 132-133 ; 326-335
2016-06-27
10 pages
Article (Journal)
Electronic Resource
English
Studies on hydraulic conductivity and compressibility of backfills for soil-bentonite cutoff walls
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Studies on hydraulic conductivity and compressibility of backfills for soil-bentonite cutoff walls
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