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RISS 인기검색어
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- 저자 : Fanlu Min (검색결과 2 건)
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Experimental Study on Lime-Treated Waste Soil Based on Water Transfer Mechanism
Fanlu Min,Jiawei Ma,Nan Zhang,Hangbiao Song,Jiarui Du,Dengfeng Wang 대한토목학회 2021 KSCE JOURNAL OF CIVIL ENGINEERING Vol.25 No.5
A large amount of waste soil (mud) is being produced from the construction of civil and infrastructures. As a result, resource utilization of the waste soil has become even more important in geotechnical engineering community. This study quantitatively investigates the underlying modification mechanism of lime-treated waste soil based on water transfer mechanism. Content of different types of water was first measured, and content of each hydration product and the Atterberg limits of soils before and after the lime treatment were then analyzed. It is found the mechanism of lime treatment is to transfer free water with low potential energy to bound water and hydration water with high potential energy. In addition, the formation of hydrates gel mainly improves soil plasticity by affecting the limit of soil plasticity. The hydration water can be used to evaluate the effectiveness of treatment and the growth potential.
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Simple Filter Cake Formation Test Method Using a Geotextile instead of the Sand Stratum
Yongjin Qian,Wei Zhu,Ning Zhang,Fanlu Min,Silin Wu 대한토목학회 2022 KSCE Journal of Civil Engineering Vol.26 No.1
Slurries and filter cakes are widely used to support the earth pressure and water pressure of an excavation surface to maintain stability. Most major projects of slurry shield need to carry out filter cake formation tests to study the availability of slurry parameters. Nevertheless, it takes considerable testing and lengthy preparation of sand to simulate a stratum, therefore this paper examines a filter cake formation test method in which a geotextile is used to replace the sand stratum. Using the geotextile as a known filter medium, the quantitative relationship is studied between the membrane and the simulated sand, to examine whether the same experimental results can be obtained as using the simulated sand. A series of filter cake formation tests were carried out on four different sands and five different geotextiles with four different slurries and then the filter membrane properties were measured to explore the potential of the geotextile alternative for filter cake formation. The results show that the infiltration process of slurry in sand and geotextile was similar, and slurry infiltration occurred both with and without filter cake. 0.8 times apparent opening size of geotextile could be used to replace the characteristic pore diameter of the sand stratum (0.8AOS = D0) for the filter cake formation tests. The filter cakes on sand stratum and the substituted geotextile had similar properties, such as thickness and water content.
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