Decision analysis on disposal of large quantities of excavated soft soil in abandoned mines using a Bayesian network

Wu, Linbo; Zhan, Liangtong; Zhang, Shuai; Song, Xinmei; Lu, Junyao; Wang, Yong

doi:10.1080/17480930.2022.2059868

Cited by 3 publications

(3 citation statements)

References 22 publications

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“…Previous studies have primarily focused on recycling systems, classification, and disposal strategies for abandoned mud [ 12 , 13 , 14 , 15 ]. However, there is a paucity of research exploring the transformation of abandoned mud into novel materials.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Hydroxypropyl Methyl Cellulose and Metakaolin on the Properties of Self-Compacting Solidified Soil Based on Abandoned Slurry

Tang,

Huang,

Shen

et al. 2024

Materials

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As a new type of backfill material, Self-compacting solidified soil (SCSS) takes the abandoned slurry of cast-in-place piles after dewatering and reduction as the main raw material, which brings a problem of coordinating the working performance with the mechanical property under the condition of high mobility. In this paper, hydroxypropyl methyl cellulose (HPMC) and metakaolin were introduced as additives to solve this problem. First, the workability and mechanical properties of SCSS were regulated and optimized by means of the water seepage rate test, the flowability test, and the unconfined compressive strength test. Second, this study also used X-ray diffraction (XRD) and scanning electron microscopy (SEM) to investigate the effects of HPMC and metakaolin on the physical phase and microstructure of SCSS. In this way, the results showed that there was a significant impact on the flowability of SCSS, that is, when the dosage reached 0.3%, the water seepage rate of SCSS was reduced to less than 1%, and the compressive strength at 7 days reached its peak. At the same time, HPMC weakened the strength growth of SCSS in the age period of 7 days to 14 days. However, the addition of metakaolin promoted its compressive strength. XRD analysis showed that the additives had no significant effects on the physical phases. And, from the SEM results, it can be seen that although the water-retaining effect of HPMC makes hydration of cement more exhaustive, more ettringite (AFt) can be observed in the microstructure. In addition, it can be observed that the addition of metakaolin can generate more hydrated calcium silicate (C-S-H) due to the strong surface energy possessed by metakaolin. As a result of the above factors, SCSS filled the voids between particles and improved the interface structure between particles, thus enhanced the compressive strength.

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Section: Introductionmentioning

confidence: 99%

The Effects of Hydroxypropyl Methyl Cellulose and Metakaolin on the Properties of Self-Compacting Solidified Soil Based on Abandoned Slurry

Tang,

Huang,

Shen

et al. 2024

Materials

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“…One way is to regulate the disposal of surface-stripped soil and change the soil construction to become more compact and stable by adding minerals that can increase soil strength. The post-mining land that has changed its construction can be traversed by vehicles and become housing and warehouse land (Wua et al, 2022). Management factors related to the soil treatments applied during mining and the diversity and composition of the resulting soil (König et al, 2023).…”

Section: Introductionmentioning

confidence: 99%

The use of basalt scoria as a geopolymer cement to increase soil bearing capacity

Saparudin,

Alisjahbana,

Rajiman

et al. 2023

J. Degrade. Min. Land Manage.

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One method that can be used to improve soil properties is the addition of geopolymer cement to the soil to become more stable. This study aimed to determine the effect of geopolymer cement on soil stability. The raw materials for geopolymer cement include clay and basalt rock, with variations in the composition of 0%, 20%, 30%, 40%, and 50%. The levels of temperature variance used were 40 oC, 60 oC, and 80 oC, with variations in 4 and 6 hours. Characterization includes X-ray fluorescence (XRF), X-ray diffraction (XRD), and scanning electron microscope (SEM) tests of raw materials and products. The highest compressive strength was obtained on a mixture of 40% basalt, 200 mesh, and a heating temperature of 80 °C for 6 hours, 56.32 MPa. The California Bearing Ratio (CBR) test showed a significant increase in the heat treatment geopolymer products. The CBR value on y1 during the 10x collision was 16.67%; in the 30x crash, it increased to 63.33%, while in the 65x collision, it increased to 78.33%. Whereas in the Y2 measurement, at 10x collisions, it was 21.11%; at 30x collisions, the CBR value increased to 82.22%; and at 65x collisions, the CBR value increased to 100.00%.

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“…Therefore, with the continuous development of urban and rural construction, the resource utilization of this excavated soil has become an urgent problem in construction projects. * E-mail: liushuai_scu@163.com To promote the resource utilization of engineering excavated soil, scholars have mainly focused on the front-end research on engineering of excavated soil in the past two years, such as recycling systems, classification, and disposal strategy analysis [4][5][6][7]. However, there is less research on how to convert it into new materials.…”

Section: Introductionmentioning

confidence: 99%

Influence of composition of curing agent and sand ratio of engineering excavated soil on mechanical properties of fluidized solidified soil

Liu

Zhan

Wang

2023

Materials Science-Poland

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With the continuous expansion of the urban scale, the development of engineering construction has been accelerated. In this process, excavated engineered soils produced in the construction process are facing the problem of difficult treatment. In this work, the influence of the composition ratio of different curing agents on the strength of fluidized solidified soil was studied. It was found that when the proportion of fly ash and quicklime in the curing agent was 1:1, and the percentage of the curing agent in the soil was 15%, the 28 days unconfined compressive strength of fluidized solidified soil reached the maximum value. When the composition and content of the curing agent and the slump of the fluidized solidified soil remained unchanged, the strength and water stability of the fluidized solidified soil increased with the increase of the sand ratio of the excavated engineered soil. X-ray powder diffraction (XRD) and scanning electron microscopy (SEM) showed that with the increase of sand in the soil ratio, more needle-like ettringite crystals were produced in the fluidized solidified soil, which were more compact, had fewer voids, and had higher overall compactness. The carbon emissions of the prepared fluidized solidified soil and the common backfill materials were calculated, and it proved that the carbon emissions of the fluidized solidified soil were the lowest. Therefore, this work offers a new method for resource utilization of excavated soil and provides a carbon emission reference for green low-carbon building materials. Finally, it was recommended to choose engineered excavation soil with high sand content to obtain higher performance from fluidized solidified soil.

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Decision analysis on disposal of large quantities of excavated soft soil in abandoned mines using a Bayesian network

Cited by 3 publications

References 22 publications

The Effects of Hydroxypropyl Methyl Cellulose and Metakaolin on the Properties of Self-Compacting Solidified Soil Based on Abandoned Slurry

The Effects of Hydroxypropyl Methyl Cellulose and Metakaolin on the Properties of Self-Compacting Solidified Soil Based on Abandoned Slurry

The use of basalt scoria as a geopolymer cement to increase soil bearing capacity

Influence of composition of curing agent and sand ratio of engineering excavated soil on mechanical properties of fluidized solidified soil

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