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화강암질(花崗岩質) 풍화토(風化土)의 시멘트에 의한 안정처리(安定處理)에 관(關)한 연구(硏究) (내구성(耐久性)을 중심(中心)으로)
도덕현 ( Duk Hyun Do ) 한국농공학회 1980 韓國農工學會誌 : 전원과 자원 Vol.22 No.3
Soil-cement mixtures involve problems in it's durability in grain size distribution and mineral composition of the used soils as well as in cement content, compaction energy, molding water content, and curing. As an attempt to solve the problems associated with durability of weathered granite soil with cement treated was investigated by conducting tests such as unconfined compression test, it's moisture, immers, wet-dry and freeze-thaw curing, mesurement of loss of weight with wet-dry and freeze-thaw by KS F criteria and CBR test with moisture curing on the five soil samples different in weathering and mineral composition. The experimental results are summarized as follows; The unconfined compressive strength was higher in moisture curing rather than in the immers and wet-dry, while it was lowest in freeze-thaw. Decreasing ratio of unconfined compressive strength in soil-cement mixtures were lowest in optimum moisture content or in the dry side rather than optimum moisture content with freeze-thaw. The highly significant ceofficient was obtained between the cement content and loss of weight with freeze-thaw and wet-dry. It was possible to obtain the durability of soil-cement mixtures, as the materials of base for roads, containing above 4% of cement content, above 30kg/㎠ of unconfined compressive trength with seven days moisture curing or 12 cycle of freeze-thaw after it, above 100% of relative unconfined compressive strength, 80% of index of resistance, below 14% of loss of weight with 12 cycle of wet-dry and above 1.80g/㎤ of dry density.
反復三軸試驗에 의한 砂質土의 動的 性質에 關한 硏究 : 液狀化 特性을 中心으로
都德鉉,高在晩 建國大學校附設農業資源開發硏究所 1989 農資源開發論集 Vol.14 No.-
The undrained cyclic triaxial tests were performed on saturated specimens of Korean standard sand, Ottawa sand, Seoul sand and Hong-Seong sand for studying liquefaction potential. The experimental results are summarized as follows; 1. The lower the relative density, the more easily liquefaction will occur and lower the confining pressure, the more easily liquefaction developed and the larger the cyclic stress amplitude, the lower the number of cyclic required to induce liquefaction. 2. The liquefaction parameters can successfully be expressed as function of stress ratio, pore water pressure ratio and cyclic shear strain. 3. The dynamic strength in HongSeong sand is greater than other sand used because of fine content. 4. The undisturbed sample of Hong-Seong sand conducted dynamic behavior like a dense sand and were more resistant towards liquefaction as compared to air pluviated specimens.
도덕현 한국농공학회 1988 한국농공학회논문집 Vol.30 No.3
The Repeated Load Triaxial and Oedometer Tests to the weathered granite & silty clay soil have been fulfilled to investigate their dynarnic characteristics. The results obtained are summarized as follows ; 1. In the relation between the repeated triaxial compression and the oedometer test, the recoverable strain of weathered granite soil showed a tendency to decrease by the increase of the repeated loads number(N), and that of silty clay showed approximately constant values while the total strain increased continuously. 2. The changes of plastic strain was dependent to the level of deviator stress which is the most important element in the calculation of soil deformation under repeated load condition. And there was a significance of 10% between the level of stress and plastic strain. 3. When the soil was aimost dried or saturated to 100%, the deformation by the repeated loads was small. However the deformation showed peak around the saturation of 50%. 4. When the deformation was predicted by the repeated triaxial load tests of a laboratory, it is desirable to introduce the threshold stress concept in the calculation of deformation of subgrade of the pavement. 5. The improved design equation (Eq. 16) introducing the modulus of conversion(Fo), which is based on the Boussineq' s theory, is considered to be rational in the design of flexible pavement. From the above results, the deformation to the repeated traffic loads could be predicted by the repeated triaxial tests on the pavement materials or undisturbed soil layers, therefore it is think that the durable and econornic pavement could be constructed by reflecting that to the design.