• 한국지반공학회:학술대회논문집
• /
• 한국지반공학회 2000년도 봄 학술발표회 논문집
• /
• pp.607-614
• /
• 2000

Settlement with crack on the hardened liners may occur in the weak clay due to waste load since the stiffness of the hardened liner is greater than that of the clay layers. Way of reducing deformation crack in the hardened liner is investigated using two computer programs, CONSOL and FLAC. The computer program CONSOL estimates the magnitude of settlement with time in clay layers and FLAC analyses the stress and deformation relationship between the foundation of landfill and waste load. The results show that a representative block of the analyzed area reaches the consolidation settlement of 1.32m, 8.8 years after the disposal of waste started with the degree of consolidation U=90%. The stress within the hardened liner exceeds the allowable vertical stress of 5kg/$\textrm{cm}^2$ and horizontal stress of 1.67kg/$\textrm{cm}^2$ at the concave part of the liner where the main and branch drainage pipes of leachate are located. It was recognized that the thickness of the interested area should be enlarged or the strength of the same area should be improved to tolerate the planned waste load.

• 한국지반공학회논문집
• /
• 제20권3호
• /
• pp.5-11
• /
• 2004

본 논문에서는 이류를 고려한 확산 실험을 통해 매립지 차수층을 이루는 점토와 실리카계와 석회계 두 종류의 고화재(PA, PB)에서의 무기물 이동특성을 알아보고 이를 순수확산 실험결과와 비교하였다. 점토와 고화층(PA, PB)에 대한 이류를 고려한 확산실험 결과 평균분산계수는 각각 $4.39\times l0^{-10}\textrm{m}^2 /s,\; 1.98\times l0^{-10}\textrm{m}^2 /s,\; 1.99\times l0^{-10}\textrm{m}^2 /s$ 로 나타나 고화층이 점토보다 높은 것으로 나타났다. 이류확산 실험 결과와 순수확산 실험결과를 비교 분석결과 이류를 고려한 경우 각각의 무기물에 대한 음이온인 염소이온의 분산계수의 값은 두 시험 결과 사이에 큰 차이를 나타내지 않았으나 범위는 이류를 고려한 경우가 순수확산의 경우 보다 적은 것으로 나타났다.

• 한국정밀공학회지
• /
• 제15권9호
• /
• pp.135-144
• /
• 1998

High speed machining is a key issue in die and mold manufacturing recently. Even though this technology has great potential of high productivity. tool wear accelerated by high cutting speed to the hardened materials is other barrier. In this research, we attempted to reduce tool wear by considering tool inclination angle between tool and workpiece. The boundary lines describing machined sculptured surfaces were represented by both of cutting envelop condition and the geometric relationship of successive tool paths. Chip cross section, and cutting length could be obtained from the calculated cutting edge and the rotational engagement angle. From the simulation results, machining inclination angle of tool of $15^\circ$ was good enough from the point of tool wear and cutting force, and this value was verified through the cutting experiment of high speed ball end milling.