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유영무,김해만,김도형,이인모 사단법인 한국터널지하공간학회 2019 한국터널지하공간학회논문집 Vol.21 No.2
Formation of filter cake with little slurry penetration into the tunnel face ground is an essential factor to successfully apply the slurry shield tunnel boring machine (TBM) for tunnelling work. However, when the bentonite slurry is in contact with seawater, it is not easy to guarantee the filter cake formation due to decrease of the swelling volume and viscosity of the slurry. In this study, in order to evaluate the effect of the seawater on the applicability of the slurry shield TBM method, the slurry injection tests were carried out with the variation of seawater percentage contained in the slurry samples as well as the variation of soil types. And then, the effect of these two factors on the slurry clogging phenomena was theoretically and experimentally figure out. As a result, it was found that the value of the slurry clogging criteria (SCC) indicating the applicability of the slurry shield TBM significantly decreases up to 67% as the percentage of seawater increases from 0% up to 20%. In addition, it was found to be necessary to take into account both the characteristics of slurry and soil types together when judging the applicability of the slurry shield TBM method by assessing the slurry penetration characteristics that will occur during tunnelling work. 슬러리 쉴드 TBM (Slurry shield TBM) 공법에서 벤토나이트 슬러리의 침투와 필터 케이크의 형성 여부는 공법의 적용성에 영향을 미치는 중요한 요소이다. 그러나 벤토나이트 슬러리는 해수와 접촉하였을 때 팽윤성과 점도가 저하되어 공법에 대한 적용성을 확보하기 어렵다. 본 연구에서는 해수의 영향에 따른 슬러리 쉴드 TBM 공법의 적용성 변화를 평가하기 위해 슬러리의 해수 비율을 다르게 하여 주입 실험을수행하였고 해수가 슬러리의 폐색 현상에 미치는 영향을 확인하였다. 그 결과, 해수의 비율이 0%에서 20%까지 증가할수록 폐색 효과에 의한 슬러리 쉴드 TBM 공법의 적용성을 나타내는 slurry clogging criteria (SCC)가 최대 67%까지도감소하는 것을 확인하였다. 또한 슬러리의 물리적 성질이 동일함에도 지반 조건에 따라 SCC값이 공법 적용에 문제가 없는 수준에서 공법 적용을 위해 슬러리에 추가적인 처리를 요하는 수준으로 변화하는 것을 통해 슬러리 쉴드 TBM의 적용성을 평가할 때 슬러리의 특성뿐만 아니라 지반 조건에 대한 고려도 필요함을 입증하였다.
Slurry Clogging Criteria for Slurry Shield Tunnelling in Highly Permeable Ground
유영무,권영삼,김태환,이인모 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.6
When tunnelling using a slurry shield tunnel boring machine (slurry shield TBM), the tunnel face stability is significantly influenced by the filter cake formation during slurry injection to the chamber. In order to study slurry penetration behavior in highly permeable ground, comprehensive slurry injection tests were performed by varying the particle size distribution of the ground, the bentonite content and viscosity, and the slurry injection pressure. According to the results of these tests, the slurry penetration behavior could be classified into three types: Type A, denoting negligible slurry penetration; Type C, denoting excessive penetration; and Type B, denoting in-between penetration. Slurry clogging criteria (SCC) were proposed to classify these three types. The main superiority of the proposed SCC is that it can consider the grain size distribution of the ground, the characteristics of the slurry, and the slurry injection pressure together when assessing the penetration characteristics. The SCC value can either be obtained by performing a simple slurry penetration test; or it can be theoretically estimated by using the regression equation proposed in this paper.
Cytokine Signaling in Tumor Progression
이명미,이인무 대한면역학회 2017 Immune Network Vol.17 No.4
Cytokines are molecules that play critical roles in the regulation of a wide range of normal functions leading to cellular proliferation, differentiation and survival, as well as in specialized cellular functions enabling host resistance to pathogens. Cytokines released in response to infection, inflammation or immunity can also inhibit cancer development and progression. The predominant intracellular signaling pathway triggered by cytokines is the JAK-signal transducer and activator of transcription (STAT) pathway. Knockout mice and clinical human studies have provided evidence that JAK-STAT proteins regulate the immune system, and maintain immune tolerance and tumor surveillance. Moreover, aberrant activation of the JAK-STAT pathways plays an undeniable pathogenic role in several types of human cancers. Thus, in combination, these observations indicate that the JAK-STAT proteins are promising targets for cancer therapy in humans. The data supporting this view are reviewed herein.