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Compressibility of ultra-soft soil in the Mae Moh Mine, Thailand
Abstract The compressibility characteristics of ultra-soft soils are an important issue for the deformation analysis of reclaimed land. This research study investigated the compressibility characteristics of ultra-soft soil present in a slurry pond, which is composed of the sedimentation and consolidation phases. The ultra-soft soil under the sedimentation process is termed as a slurry while the ultra-soft soil after completion of sedimentation is termed as a sedimentation soil. The samples were obtained from a slurry pond in the Mae Moh mine, Lampang province, Thailand. A series of sedimentation tests were performed on slurry at various initial water contents, w i, ranging from 116% to 437%. It was found that the sedimentation curve of the Mae Moh slurry was divided into two distinct different stages, being flocculation and settling. A novel parameter, being the critical water content (w cr) was proposed to separate the large sedimentation slurry and small sedimentation slurry. The w cr for Mae Moh slurry was found to be 171%. The sedimentation water content, w s was found to be equal to w cr for the slurry undergoing large sedimentation and lower for the slurry undergoing low sedimentation. The consolidation curve of the large sedimentation soil was assumed to be unique for different w i. The w s of small sedimentation soil is governed by w i and thus the consolidation curves are different for different w s. The consolidation curves of the ultra-soft soil at different w s can be assessed by a proposed generalized S-shaped equation. The intrinsic state line for high sedimentation soil was proposed for examining the stress state and predicting the consolidation curve of the ultra-soft soil, which is significant for reclamation projects.
Highlights Analyze sedimentation behavior of ultra-soft soil at different initial water contents Propose a critical water content to separate the large and small sedimentation slurry Propose generalized S-shaped equation to predict the consolidation curve of ultra-soft soil Propose an intrinsic state line to assess the stress state of ultra-soft soil Recommend a settlement calculation method for ultra-soft soil
Compressibility of ultra-soft soil in the Mae Moh Mine, Thailand
Abstract The compressibility characteristics of ultra-soft soils are an important issue for the deformation analysis of reclaimed land. This research study investigated the compressibility characteristics of ultra-soft soil present in a slurry pond, which is composed of the sedimentation and consolidation phases. The ultra-soft soil under the sedimentation process is termed as a slurry while the ultra-soft soil after completion of sedimentation is termed as a sedimentation soil. The samples were obtained from a slurry pond in the Mae Moh mine, Lampang province, Thailand. A series of sedimentation tests were performed on slurry at various initial water contents, w i, ranging from 116% to 437%. It was found that the sedimentation curve of the Mae Moh slurry was divided into two distinct different stages, being flocculation and settling. A novel parameter, being the critical water content (w cr) was proposed to separate the large sedimentation slurry and small sedimentation slurry. The w cr for Mae Moh slurry was found to be 171%. The sedimentation water content, w s was found to be equal to w cr for the slurry undergoing large sedimentation and lower for the slurry undergoing low sedimentation. The consolidation curve of the large sedimentation soil was assumed to be unique for different w i. The w s of small sedimentation soil is governed by w i and thus the consolidation curves are different for different w s. The consolidation curves of the ultra-soft soil at different w s can be assessed by a proposed generalized S-shaped equation. The intrinsic state line for high sedimentation soil was proposed for examining the stress state and predicting the consolidation curve of the ultra-soft soil, which is significant for reclamation projects.
Highlights Analyze sedimentation behavior of ultra-soft soil at different initial water contents Propose a critical water content to separate the large and small sedimentation slurry Propose generalized S-shaped equation to predict the consolidation curve of ultra-soft soil Propose an intrinsic state line to assess the stress state of ultra-soft soil Recommend a settlement calculation method for ultra-soft soil
Compressibility of ultra-soft soil in the Mae Moh Mine, Thailand
Ngo, Dong Huy (author) / Horpibulsuk, Suksun (author) / Suddeepong, Apichat (author) / Hoy, Menglim (author) / Chinkulkijniwat, Avirut (author) / Arulrajah, Arul (author) / Chaiwan, Apipat (author)
Engineering Geology ; 271
2020-03-18
Article (Journal)
Electronic Resource
English
Compressibility of ultra-soft soil
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