연약한 실트지반과 오염된 실트지반의 안정관리 방법에 관한 연구

안종필,박상범 한국지반공학회 2008 한국지반공학회논문집 Vol.24 No.6

This study investigated the existing theoretical backgrounds in order to examine the stability control method of lateral flow caused by the plasticity of soils when unsymmetrical surcharge works on polluted soils and then compared and analyzed the results measured through model tests. Ultimate bearing power of ML and MLp1 and MLp2 obtained at surcharge(q)-settlement(Sv) curve showed similar trends to ultimate bearing power obtained from control chart of deflection (Sv-Ym) by Tominaga・Hashimoto, that of Sv-(Ym/Sv) by Matsuo・Kawamura and that of (q/Ym)-q by Shibata・Sekiguchi and so it is considered that it has no problem in actual applicability. {Sv-(Ym/Sv)} of control chart of MLp1 by Matsuo・Kawamura showed smaller value than ultimate bearing capacity value from surcharge-settlement curve (q-Sv). Expression of ML of fracture baseline at stability control charge by Matsuo・Kawamura is Sv=3.21exp{-0.48(Ym/Sv)} and expression of MLp1 is Sv=3.26exp{-0.96(Ym/Sv)} and expression of MLp2 is Sv=6.33exp{-0.45(Ym/Sv)}.

防潮堤의 壓密沈下量 解析에 관한 考察

安鍾弼,朴吉鉉,金永先 조선대학교 국토개발연구소 1988 국토개발연구 Vol.8 No.1

In Seadyke design a surface stress Calculation using osterberg chart for few point has been generally used to settlement quantity Computation. This study is developed to the Computer Program of integral formula having a Zonal triangular load, A few Case studies are examinedand find out degree of error about the Cross section. This results can be use to the seadyke design.

우리나라 서남해안지역 해성점토의 지반특성

안종필,박종호 조선대학교 생산기술연구소 1996 生産技術硏究 Vol.18 No.1

One of the main objectives of the study is to grasp the soil characteristics of Marine Clay in south and west coastal area of the Korean Penisula. The characteristics on Natural Water Content(Wn), Liquid Limit(LL), Plastic Index (PI), Unit Weight (y_(t)) , Cohesion (C), Internal Friction Angle(φ) were analyzed and investigated with the result of Indoor Tests. The tests were carried out by Rural Development Corporation(RDC) for the purpose of developing the tide land where are located in south and west coastal area in Korean Peninsula from 1987 to 1989. The relationship between the soil characteristics were analyzed with Statistical Analysis System & Quattro program. The regression equations analyzed were tabulated and shown in nornographs in order to use them during designing and planning sea dike and marine structures on the coastal area, constructing and maintaining the structures.

터널과 도로 및 교량에 대한 VE/LCC 분석에 관한 연구

안종필,박경호,임재춘 朝鮮大學校 建設技術硏究所 2006 建設技術硏究 Vol.26 No.1

It is actual state in our country that the number of tunnels on the road increases consistently but there is no study or computer program on life cycle cost Ihereinafter "LCC") of tunnel. This research is for the purpose of calculating the LCC for tunnel on the road and applying it to the systematic maintenance & management and analysis of economical efficiency. Further the developed computer program calculating the LCC for tunnel on the road increases the efficiency in tunnel design and in decision of investment considering the maintenance & management and the economical efficiency and it will be a useful tool with relation to VE/LCC technique. VE analysis is constituted of performance represented by P. life cycle cost represented by C and value represented by V. P is calculated under considering weight and degree of estimation which explain the importance of each facilities to the estimation item. C is determined from getting sum of the present prices of initial construction cost, maintenance & management cost during service life, break-up & disposal cost. V is obtained from dividing the P by C, that is V=P/C. The estimation list of the maintenance & management on tunnel has been set up as items whose maintenance & management cost was appeared to be relatively larger than the others and there were decision of the variables of effect such as frequency of maintenance & repair, unit cost, repairing rate, etc.. And also, all the cost were converted into present prices considering the economic variables for example discount rate, etc. Excel base LCC analysis system of tunnel on road was developed and tested on a sample tunnel.

Sand Drain과 Sand Compaction Pile로 보강된 연약지반의 안정성 검토

안종필,박주원,류성기 朝鮮大學校 建設技術硏究所 2004 建設技術硏究 Vol.24 No.2

The construction of roads, bridges and buildings on the ground consisting of frail soft soil or organic soil as it may cause safety problems due to lack of supporting force and over-sinking. It is absolutely necessary to change the form of structures, to decrease internal force by consolidating the base sides of the structures, and to replace frail layers with good-quality materials for enhancement's sake. This paper is designed to make a comparative analysis of safety before and after sand drain methods and sand compaction pile methods were applied On the basis of the results of drilling surveys and indoor tests Sand drain construction methods are introduced to tackle 10-meter-deep frail layers. In case drain intervals are 2.0m ~ 3.5m wide when the construction method reaches 90% of consolidation degrees, 79 months ~ 74 months can be expected in terms of shortened time, respectively. If drain interval drops, the period when 90% of consolidation degrees are reached can be reduced by 2 percent. 2.7 meter-deep banking can be done on the raw soil in case the rate of standard safety against activity destruction stands at 1.25. However, in case four-stage banking is made, 6.8 meter-deep banking is made possible, and in case sand compaction pile construction methods are simultaneously used along with stage-based banking, the maximum baking can be 9.8 meters high ~ 9.0 meters high when drain intervals are 1.8 meters wide ~ 2.2 meters wide, respectively.

연약지반중의 흙막이구조물의 거동해석에 관한 연구

안종필,기완서,오영신 조선대학교 국토개발연구소 1997 국토개발연구 Vol.17 No.1

Recently, a rapid economical development and industrialization require large amount of land of industrial estate and expansion of citis. Therefore the construction of large and deep basements takes place in built up areas where the braced excavation for earth retaining structures causes many problems such as settlement and damages of nearby buildings and underground utilities. This study deals with the behavior of the retaining earth structures and the ground movement around it based on the measuring results which were obtained from the two ground sites. The results of elasto-plastic wall design program involving the effect of lateral flow pressure showed a good agreement with the output of finite difference computer program which covers the behavior of wall as the ground movement around it.

매립지반의 활용에 따른 문제점에 관한 사례연구

안종필,김건국,박경호 朝鮮大學校 建設技術硏究所 1998 建設技術硏究 Vol.18 No.1

Recently, there will be need to make up construction site on the reclamation ground in considering effective using the small country and expansion of urban site. therefore, there is coming many troubles such as effluence of seepage-out water and differential settlement as constructional structure is made on the soft reclamation ground. This study, examined behavior of foundation, property and behavior of pollution matter and the stable term of reclamation ground when reclamation ground is used to construction site, indicate that there are necessary fact for maintenance-management to investigate 10 case of reclamation construction for the analysis of troubles and their cause. Usually, the reclamation ground is constructing on the soft soils and lubricate action of pollution matter cause the lateral flow pressure to foundation pile. if there were considered to differential settlement pipe-line-arrangement of underground structure must be constructed with flexible joint and reclamation will be required to aseismic design as the shearing force of reclamation ground is suddenly decreased by vibration owing to construction property

신뢰성 이론에 의한 기초구조물 가치분석 모델 개발

안종필,박주원,서재우 朝鮮大學校 建設技術硏究所 2007 建設技術硏究 Vol.27 No.2

Development of design method based on probability theory sublating discrepancy of definitive design standards in designing foundation structure is needed. This study develops uncertainties of resistance and load effect of foundation structures in order to introduce the concept of probabilistic design based on reliability into foundation structures, estimate reliability index suitable to foundation structures, compares and analyzes safety and durability performance and the results of research can be summarized as follows. Optimum safety radio of bearing power of pile foundation was estimated as 2.9613 according to interpretation of reliability and it was analyzed in a rational way compared to uniform safety ratio value based on conventional allowable stress design methods, and as a result of analyzing life cycle cost of foundation structures, it was confirmed that execution of maintenance and management strategy in repair and maintenance condition of safety evaluation grade B was most economical. In addition, prevention LCC/post LCC ratios of foundation structures for life cycle of 80 years were 60.54%, 54.58%, 52.27% and 49.29% at maintenance, repair, reinforcement and replacement respectively and prevention and maintenance strategy was more economical than post maintenance strategy. It is expected that the results of this study will be used as basic materials to build analysis techniques of reliability and economy of foundation structures through expansion of statistical data of foundation structures.

모래가 섞인 실트지반의 측방유동에 관한 연구

안종필,박주원,김대해 朝鮮大學校 建設技術硏究所 2003 建設技術硏究 Vol.23 No.1

This study analysed general behaviors of the lateral flow when unsymmetrical surcharge is worked on silt soils mixed with sand through model tests, and then investigated comparing with the existing suggestions. The critical surcharge, the point of time when lateral flow begins to occur was q_(cr),=0.40C_(u)-0.01 and the ultimate surcharge was q_(ult)=1.73C_(u)-0.10. The maximum lateral flow pressure was slightly lower theoretical value than that of the experiment value when the ultimate surcharge works, which indicates excessive consideration of safety rate. The formula of maximum lateral flow pressure of the silt soils mixed with sand was P_(max)=-5.27q_(ult)²+5.0q_(ult)+4 19. It occurred at 0.25H∼0.4H, which indicates that its occurrence depth was vertically distributed at 0.3H. The quadrilateral distribution where P_(0)=P_(max)/3 as the lateral flow pressure was applied bore a great resemblance to the distribution according to actual measurement. As the displacement obtained in the model tests was applied to the control diagram {Sv-(Ym/Sv)} presented by Matsuo·Kawamura, the result was that ; the destructive surcharge according to the standard of Matsuo·Kawamura showed a slightly lower value than the ultimate surcharge and the formula of settlement of the ultimate surcharge obtained in the three model tests was Sv=0.95exp{3.62(Ym/Sv)}.

파압과 토압을 받는 호안구조물의 안정해석

안종필,박주원 조선대학교 국토개발연구소 1996 국토개발연구 Vol.16 No.1

The time seems to have come when we should pay more attention to the land extention by reclamation of coast. This study is a practical treatise on the stability analysis of revetment structures. For illustrative purposes, the attention of the stability analysis to a revetment structure considered four examples. As a result of stability analysis the safety factor of cap concrete sliding came out as a sequence that the slope revetment with T.T.P block is beggest among all types and is influenced by rigidity of covered materal and slow incline of slope. The safety factor of straight slope sliding and circular sliding failure came out as a sequence that the slope reetment with rubbles is biggest among all type and is influenced by slow incline of slope and increased rigidity of covered materal. The safety factor of oveturnning and bearing capacity came out as a sequence that the slope revetment is bigger than the vertical type and is influenced by slow incline of slope and increased width of structure. In a design for revetment structure, it has to be a planned by a comparative analysis of each safety factor and the merits or demerits.