http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : 도덕현 ( Doh Duck Hyun ) (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
-
방사선측정치(放射線測定値)를 이용(利用)한 아스콘 포장(鋪裝) 및 노상(路床)의 현장밀도(現場密度)와 함수비(含水比) 측정(測定)에 관한 연구(硏究)
진성기 ( Jin Sung Ki ),도덕현 ( Doh Duck Hyun ) 한국농공학회 1994 韓國農工學會誌 : 전원과 자원 Vol.36 No.4
The objective of this study was to determine the criteria for density and moisture content measurements made with a nuclear density meter on common materials in the construction field. The study also sought to test a full-type nuclear density meter in controlling the density of overlay layers(2.5~5.0cm). In order to determine the accuracy and reliablility of nuclear guage measurements made on construction materials, laboratory and field tests were conducted. Wooden blocks(65x45x50cm) and a special steel compactor(4.7kg) were constructed in order to carry out tests which were conducted on three different materials; coarse gramed soil, fine grained soil, and AC material. Throughout all laboratory and field tests, the nuclear density and moisture content were determined using Humboldt 5OOLP nuclear gauge. The tests on subgrade material entailed obtaining density measurements by means of both the sand replacement method and the nuclear density meter. The results of the sand replacement method were then compared to the readings recorded bu the meter. As in the subgrade material tests, density measurements made during AC pavement tests were also determined using the unclear meter in addition to a second means; through the core method. The meter readings and core densties were compared as was done in the tests on subgrade materials. The correlation between the results of the sand replacement test(also, the core method) and meter readings on subgrade material was then determined. Similarly, the observed results were then analyzed through linear regression. The tests to determine thin-lift density by means of a full-type nuclear density meter also conducted on the overlay layers(about 4. 8cm thickness) above AC pavements at road construction sities in Korea
-
都德鉉,安成鎬,金善柱 건국대학교 산업기술연구원 1995 건국기술연구논문지 Vol.20 No.-
간척지 준설토의 퇴적 특성을 구명하기 위하여 충남 당진군 일원의 서남해안 干拓綜合開發事業 石門地區에서 준설공사를 하고 있는 排水閘門 引水路 浚渫土를 시료로 채취하여 시험분석한 결과를 요약하면 다음과 같다. 1) 本 試驗圃의 토질은 실트질 점토로서 浚渫 排砂管 吐出口 부위별 含泥率은 상부 7.36%, 중간부 18.85%, 하부 50.95%이고 평균값은 25.72%이다. 2) 堆積狀況은 浚渫 排砂管 吐出口를 중심으로 주위 약 30m까지는 粒子가 큰 모래와 점토 덩어리가 퇴적되고, 유속이 작은 원거리에서는 細砂 및 실트가, 精水狀態에서는 粘質土가 퇴적되므로 약간의 유실이 발생되어도 준설시의 유속을 크게 하면 粗粒子만 퇴적되어 양질의 지반을 얻을 수 있는 것으로 나타났다. 3) 浚渫土의 콘支持力 변화는 준설 3개월 후 준설 배사관을 중심으로 40∼60m 범위의 콘支持力(qc)은 2.0kgf/㎠, 一軸壓縮强度(qu)는 0.16~0.20kgf/㎠ 정도로서 超濕地에서 濕地로 支持力 증가 속도가 상당히 빠르고 60m 이상에서의 콘支持力(qc)은 0.5~1.0Kgf/㎠ 정도, 一軸壓縮强度(qu)는 0.02~0.06kgf/㎠로서 매우 연약한 超濕地임을 알 수 있었다. 4) 준설토의 강도증진은 자중압밀에 의한 강도증가보다 건조수축에 의한 강도 증진이 빠르고 크기 때문에 이 특성을 이용해서 浚渫盛土高를 20∼30㎝로 하여 건조수축시킨 후 반복적으로 浚渫盛土를 실시한다면 양호한 지반을 얻을 수 있을 것으로 생각된다. 5) 浚渫 排砂管 설치는 本管에 分岐될 지점에 직경이 다른 티(T형, Y형)를 가설해 두어 排砂管 移設에 필요한 경비를 절감할 수 있고, 排砂管 간격을 30m 전후로 배치하면 地盤改良에 필요한 공사비를 절감할 수 있는 것으로 나타났다. In order to study the deposition characteristics of dredged materials in the reclaimed area, deposition process of dredged materials and soil strength parameters in the Sukmoon Project area, which is located in the southeastern coast, have been analyzed with in-situ tests and laboratory research. The results obtained are as follows: Soil texture of the tested plot was silty clay, and the soil content of discharge flow by the part of pipe outlet was 7.36% at the upper part, 18.85% at the middle part and 50.95% at the lower part. Three different characteristics have been investigator from the observations on the relationship between the discharge flow velocity and soil particle size. Coarse sand and clusters of clay were deposited within the range of approximately 30meters from the outlet of discharge pipe where the flow velocity was relatively high. From 30meters to 60meters, finer particles were accumulated, and beyond this range, very fine clay particles were sedimented. So the results showed that the strength properties of dredged materials could be increased as the discharge velocity increased. In three months after the completion of dredging that was carried out within a range of 40∼60meters from the outlet and at a depth of 1.0m below the ground surface, the cone resistance(qc) and unconfined compression strength(qu) was 2.0kgf/㎠ and 0.16~0.20kgf/㎠, respectively, indicating that the increasing rate of bearing capacity is high. Beyond this range, qc and qu varied 0.5~1.0Kgf/㎠ and 0.02~0.06kgf/㎠, respectively, which is quite soft. Shear strength of the dredged materials increased evidently resulted from the shrinkage of drying rather than consolidation caused by the self-weight of deposition. Setting of the desilting scour pipe needs a "T" or "Y" type branch pipe of a different diameter to save the cost of setting. From the result of this study, it was found that if the desilting scour pipe is built with 30m spacing, the cost for land improvement can be saved.
ScienceON
KISS연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
