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윤성학(Yun Sung-Hak),이건(Lee Kun),사상호(Sha Sang-Ho),박세주(Park Sei-Joo),라일웅(Ra Il-woong),천윤철(Cheon Yoon-chul),조남준(Cho Nam Jun) 한국철도학회 2005 한국철도학회 학술발표대회논문집 Vol.- No.-
The uncemented breccia consisted of conglomerate and breccia, which are not originated from volcanic clastics, shows wide variation of engineering properties depending on the characteristics of matrix of the uncemented breccia. These uncemented breccia have breccia and matrix irregularly distributed according to their depth and position. Clay minerals are also included in the matrix of these uncemented breccia, so they are expected to show expansive behavior and weakness against weathering process. In this study, the volumetric ratio of breccia on the cores had been calculated using digital image processing technique (performed on recovered core box and their sections). The 3-axial compressional strength test had been done with a shaping of rapid cooling method, and the shear strength (c, φ) of uncemented breccia due to the breccia content had been calculated by applying BIMROCK model curve suggested by Goodman. A reliable analysis on the engineering properties of uncemented breccia had been also possible by using borehole density logging and borehole loading test for the accurate determination of the unit weight and the deformation constants deformation modulus.
성토사면에 적용된 Soil Nailing의 주면마찰특성 연구
이성철,김명학,김상현,윤성학 인제대학교 2001 仁濟論叢 Vol.16 No.1
Soil Nailing 공법은 사면안정을 목적으로 보강재를 사용하여 지반을 보강하는 현장 지반보강 공법의 일종이다. 지금까지는 일반적으로 Soil nailing이 주로 절토사면을 보강하는 기술로 사용되고 연구되어 왔으나 본 논문에서는 붕괴된 사면에 재성토를 시행한 현장에 대한 보강공법으로서의 적용성을 연구하였다. 이를 위하여 네일에 스트레인 게이지를 부착하고 현장인발실험을 수행하여 최대인발하중을 조사하고 각 지층에서 발휘되는 단위 주면마찰력을 산정하였다. 그리고 본 연구에서 얻어진 겉보기 평균 주면마찰력을 일반적인 절토사면에서 현장인발실험을 수행한 다른 사례의 겉보기 평균주면마찰력과 비교분석해 보았다. Soil nailing is in-situ ground improvement technique of reinforcing soils using passive inclusions for the purpose of slope stability. Also soil nailing, in general, was used and studied as a reinforcement technique at cut slope, but this paper presents the results of study for soil nailing application as a reinforcement technique at the banking over slided slope. In-situ pull-out tests of nails, instrumented with strain gauges, were performed to investigate the maximum pull-out load and to calculate the unit side resistance in each different layer, And the apparent average unit side resistance of this study was compared with that of other sites installed at cut slop.