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In case of embankment in soft ground, must know whether base can support as is stable. That improve base using Sand Compaction File Method that is used mainly in soft ground improvement method of construction, recognized using whether when did sphere of soil improving differently, conduct of base by this changes how or 2D-σ for windows that is finite element program to search proper improvement dimension.
The controls for safe construction of road embankment on soft clays should be performed not to develope any distresses in the pavement structures. For this construction controls engineers measure consolidation settlements of the soft clays during and after placing embankment, analyze them, and then predict residual settlements. In this study, numerical analysis are performed for investigating each influence factor on central settlement. for example geological characteristics and material properties.
Recently reinforced earth method using geosynthetics as a reinforcement has been getting popular and usefulness also has been increased due to reductions in costs and ease of construction and great exterior view. Geosynthetics are now being used as ground reinforcement materials all over the world, because we can make ground structures using geosynthetics economically and safely. The most important part in the earth reinforcement is the interface between soil and the reinforcement. Shear strength and shear behavior in this interface make a great role relating to the reinforcement effect. this paper presents 2 kinds of direct shear test results
묘도-광양간 현수교는 광양항에 진입하는 항로에 위치해있으므로 큰 배들에 대하여 충돌 방지공이 필요하다. 본 논문은 선박충돌을 고려하여 위험도 분석과 비선형 수치해석을 실시하였다. 위험도 분석 결과 충돌 방지공 설치 이전에는 연간 파괴확률이 기준치인 0.0001을 초과하여 충돌 방지공이 필요한 것으로 분석되었다. 따라서, 선박의 충돌을 방지하기 위해서 인공섬과 콘리트트 블록으로 만든 방파제 벽을 사용하여 설계하였다. 계획된 충돌 방지공 설치 후 비선형 수치해석 결과 교량에 미치는 하중이 교량의 내하력 이내로 나타나 선박 충돌시에도 교량의 안정성이 확보되는 것으로 나타났다. The suspension bridge between Myodo and Gwangyang is located in the main navigation channel to Gwangyang Harbor. So, there is need for the collision protection against large vessels. In this paper, the method of risk analysis and non-linear numerical analysis are conducted to consider the ship collision effects. The results of risk analysis, the annual frequency of collapse is more than the acceptable frequency 0.0001. Therefore, as a ship collision protection, island protection with concrete block quay wall is planned. The ship collision force on the pylon is less than the lateral capacity of pylon from the nonlinear numerical analysis.
Geotextile tube method is the latest application process to construct a variety of civil structures such as river and coastal structures by using geotextile which is a high polymer synthetic fiber. In this paper, laboratory tests and field tests were conducted in order to identify the behavior, stability and application possibility of geotextile tube which prevents the erosion of coastal sand. As a result of large-scale direct shear test, which is one of laboratory tests, the increase in friction angle was shown as the relative density increased, and friction angle of sand/geotextile was larger than that of sand/sand. As a result of field test, the behavior and stability during construction and after construction were identified through measurement, and the effect of preventing erosion was confirmed. 토목섬유튜브공법은 고분자 합성섬유인 지오텍스타일을 활용하여 하천 및 해안구조물을 비롯하여 다양한 토목구조물을 축조할 수 있는 최신 적용공법이다. 본 논문에서는 해안가 모래의 침식을 방지를 위해 토목섬유튜브의 거동과 안정성, 침식방지 활용 가능성을 파악하고자 실내시험과 현장시험을 실시하였다. 실내시험인 대형직접전단시험 결과에 의하면 상대밀도가 증대됨에 따라 마찰각이 증가함을 알 수 있었고, 모래/토목섬유의 마찰각이 모래/모래의 마찰각보다 더 크게 나타났다. 현장시험 결과에 의하면 계측을 통해 시공 중 및 시공 후의 거동과 안정성을 파악하였고 침식방지 효과를 확인하였다.
The expansion of old road is needed in constructing the entrance at the $\bigcirc$$\bigcirc$I/C road in $\bigcirc$$\bigcirc$city. To strength the national competition, many agents who concerned do their best for finishing that construction early as soon as possible. In generally, soil embankment on soft foundation is caused to reduce the stability by making the settlement of ground surface due to the over load. Thus, we try to make it stable by building EPS embankment construction which in our working place is one kind of the method of light embankment construction after excavating the original ground.
Since 1970s, though many effective construction methods have been established to solve soft ground problems which had occurred in the off shore land reclamation and on shore highway construction, lateral movement of structure on soft ground is still a big problem to engineers. In this study an applicability of criteria for determining the lateral movement of the structure in soft ground is examined and most measured data is obtained from 140 bridge abutments in highway construction sites. Characteristics and effectiveness of existing methods that used for deciding amount of lateral movements of abutment are analyzed using the obtained data. From the analysis, a proper method to prevent lateral movement is proposed. This method is confirmed on several case histories which were constructed on marine clay.