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이처근,허 열,남기복 충북대학교 건설기술연구소 1999 建設技術論文集 Vol.18 No.1
Propped retaining walls are frequently used to retain the sides of road and cuttings, and to form temporary cofferdams to enable the construction of underground structures. These walls maintain stability and prevent excessive soil movement. The magnitude of the soil movements will depend on the geometry of the cutting and wall, the properties of the wall, and the position of the props. In this study, centrifugal morel tests were performed to investigate the behavior of flexible and rigid earth retaining walls supported by props in the process of the step excavation. Jumunjin standard sand was used for foundation soil. The raining method was adopted to form the required relative density of the model ground. The model tests were fulfilled by increasing g-level(40g) to get in-situ condition, and at rest earth pressure is measured at every five g-level. During excavations and installation of prop, horizontal displacement and lateral earth pressure are measured by UPC board and PC at each step. The magnitude and the distribution of lateral earth pressure measured from tests were compared with those obtained by Tschebotarioff's and Terzaghi-Peck's methods. Also, the horizontal displacement measured from tests was compared with those obtained by elasto-plastic beam analysis method.
김봉수,이처근,허 열 충북대학교 건설기술연구소 1998 建設技術論文集 Vol.17 No.2
This paper is an experimental study Go investigate the feasibility of using the paper mill sludge as the cover, liner in waste disposal landfill and other construction materials. Basic soil properties tests, compaction tests in laboratory, permeability tests, consolidation test, unconfined compression tests and other tests are carried out to evaluate basic soil properties, compaction, permeability, compressibility, and compressive strength of paper mill sludges. Unconfined compression tests were conducted on remolded samples. In order to investigate the soil engineering properties of paer mill sludge, the Lest results were compared with those obtained of soft clay. Paper mill sludges have a high water content and a high degree of compressibility and behave like a highly organic soil. Consolidation tests reveal a large reduction in void ratio and high strain values. The results of unconfined Compression tests show that paper mill sludge had a larger unconfined compressive strength than the soft clay. Also, the maximum dry density of paper mill sludge was approximately 71% less than that of the soft clay.