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허노영,전용백 대구대학교 산업기술연구소 1994 産業技術硏究 Vol.13 No.-
This paper is studied to the active pressure of the Coulomb's theory and the graphic solution method by the numerical analysis in computer and the actually experimentation. The following are the results: 1. The maximum active pressure depended on depth was found at depth of 32.5cm regardless of assumed failure point but not gaged at 66cm depth This results were inconsistent with the classical theory. 2. Displacement of rigid wall was maximum at depth of 0.4m assumed failure point and of 0.2m below ground and appeared the tendency declined more depth of rigid wall. 3. According to results of experimentation, assumed failure surface appeared at more or less 0.4m distance horizontally from rigid wall. 4. The results of active pressure by numerical analysis were correspond with those of Coulomb's theory and distribution line of soil pressure was parallel with each other. 5. The results of experimentation disagree with those of theory. At a guess, the pressure transducer were not established closely.
응력에 따른 이암의 Slaking과 각종 지반상수 변화 특성
김영수,허노영,박시현 경북대학교 산업기술연구소 1996 産業技術硏究誌 Vol.24 No.-
본 연구는 경북 포항일대에 분포하는 이암에 대하여 다양한 역학 실험을 실시하여 각종 지반 물성치를 찾아내고 응력에 따른 그 변화특성을 규명한 것이다. 우선 시료를 지하 20m에서 시추 또는 절취 사면에서 분리된 암괴에 대하여 NX 코아 채취기를 이용하여 길이 100㎜, 지름 54㎜의 크기로 성형하였다. 이러한 성형시료에 대하여 XRD 시험 및 3가지 방법에 의한 비중 시험, 공극률 및 흡수율 시험을 실시하였으며 고결과 정도를 파악하기 위해 Slaking 내구성 지수 시험을 실시하였다. 또한 역학시험으로는 간접인장시험, 일축압축 시험, 응력이력 시험 및 삼축압축시험을 실시하였다. 이러한 다양한 물성 및 역학 시험 결과를 이용하여 응력의 변화에 따른 Slaking 특성과 각종지반상수를 도출하여 그 변화추이를 고찰하였다.
김영수,허노영,우상진 경북대학교 환경과학연구소 1997 環境科學硏究所論文集 Vol.11 No.1
Sedimentary rocks in Taegu-Kyungpook area have anisotropic characteristics. They are different physical and mechanical properties according to the angle of bedding planes. In order to offer fundamental data for design and construction, several tests (Brazilian tensile test, uniaxial compression test, triaxial compression test) were carried. As results of testing, strength and elastic modulus have the smallest value at angle 60. The behaviors of anisotropic rock are investigated by using a numerical analysis. The rocks are modeled as a linear elastic, transversely isotropic material and a finite element program is developed in two-dimensional plane-strain state to determine the magnitude and distribution of stress nonuniformity. This pmgram can run according to bedding angle(l3) and anisotropic ratio(n). Stress diagram in sedimentary rock region has unsymmetrical distribution and stress concentration points varies according to the angle of bedding plane. Underground structures and openings show different behaviors depending on the characteristics of discontinuities such as beddings, faults, joints. Designing the rock structures without considering the significance of these discontinuities can lead to false conclusions. For economical and safe construction, designer must consider these characteristics.