J.S.P로 보강된 흙막이벽의 변형거동에 관한 연구

주승완,윤선호 서강정보대학 1999 산업과학연구 Vol.1 No.-

This study examining the effect of horizontal displacement restraint on ground behind propped retaining walls caused by J.S.P improvement body and the effect of earth pressure reduction and compared horizontal displacement of earth retaining walls changeable according to the step by excavation, and earth pressure affecting to walls, with those of the monitoring measured in inclinometer by means of the finite element method based on the proper model in pre- and pro-J.S.P construction and the numerical analysis using general elasto-plastic analysis such as SUNEX, EXCAV. The results were as follows: Horizontal displacement reduction was analysised by FEM through excavation steps in pre- and pro-J.S.P construction It concludes that the reduction amount was showed from 0.1mm to 0.3mm by single lap while the reduction amount. It showed that the effect of horizontal displacement restraint caused by the growth of rigidity in walls. It showed that the place of maximum displacement generation was 0.22~0.25H distant from excavation ground.

철근콘크리트에 교량의 중성화에 관한 연구

주승완,윤선호 서강정보대학 2001 論文集 Vol.20 No.-

In this study, 25 bridges which material-age was from 10 years to 30 years in Chonnam province were examined for neutralization test in order to obtain durability by examining neutralization. The mechanism of carbonation and influencing factors to the carbonation by considering the depth and the speed of carbonation are compared with data measured from field tests. Based on the analysis and comparison, the range of carbonation speed coefficient is proposed and the relationship between carbonation depth and remaining lifetime is predicted. This study aims to provide the reference data, which will calculate lifetime of Reinforced concrete bridge and utilization of carbonation factors.

다짐도에 따른 화강풍화토의 역학적 특성에 관한 연구

주승완,김선학 서강대학 지역발전연구소 2004 지역발전연구 : 서강전문대 Vol.10 No.-

In this study do we collect the Wethered Granite Soil of Gwang-ju Pung -am district and Youm-ju-dong Gwang-ju world cup stadium construction field and identify physical character according to basic physical test and summerged the sample of 85% degree of compaction in the dry side and wet side in a water tank for ten days on the basis of the sample of 80%, 85%, 90% degree of compaction and Optimum Moisture Ratio in the Optimum Moisture Ratio state in order to exam permeability and compression character of the Weathered Granite Soil according to the compaction state of retaining wall, abutment bankfill banking. We perform falling head permeability test and them standard compaction test and calculate coefficient of permeability and consolidation constant according to the test result. We have a mind to clear permeability and compression character of the Weathered Granite Soil of this study area according to relation curve of the calculated coefficient of permeability, consolidation constant and void ratio, degree of compaction. Therefore compression constant, according to the compaction energy of Optimum Moisture Ratio, is in inverse proportion linearally in the Weathered Granite Soil of WGS 1 and WGS-2 and coefficient of permeability increase directly in a range of void ratio e=0.627~0.779, e=0.657~0.800.

연약지반상 성토시 측방변위 거동에 대한 유한요소해석

주승완,김선학 서강전문대학 지역발전연구소 2003 지역발전연구 : 서강전문대 Vol.9 No.-

If we embank on the soft ground, to construct road and other structures, Settlement and lateral displacement in the subground develop during and after the construction of embankment. Because lateral displacement and settlement in the ground can affect close structure and piles and used as important measure data indeciding safety of the embankment frame, it is important precisely to forecast the size and distribution of lateral displacement and settlement. Therefore, in this study, to analyze lateral displacement according to construction and ground condition, practiced two dimentional finite element analysis using the finite element analysis program SAGE CRISP 4.02. Embankment condition is the change of embankment decline and velocity, Ground condition is the change of drainage condition, OCR and permeability coefficient and the mixture of over consolidation layer and sand layer in the ground. As a result of analysis, whole lateral displacement increase inconstant velocity before embankment completion and after embankment completion, lateral displacement velocity decrease and is very small in 1000days. Besides, maximun lateral displacement in the embankment frame hem is restrained according as hardness of the ground is large and drainage well occurs.

암반사면의 안정성과 평가 및 적용에 관한 연구

주승완,윤선호 서강정보대학 2002 論文集 Vol.21 No.-

In general the evaluation process of rock slope stability is an ambiguous system which is made up of ideas subjected to practical experience of an expert. This paper aims to propose more effective methods that helps engineers to evaluate the stability of rock slope by using RMR(Rock Mass Rating for the Geomechanics Classification) and Stereographic Projection and Fuzzy Approximate Reasoning Concept.

대상하중을 받는 점토지반의 소성침하와 제체안정성 해석

심태섭,주승완,김용운 朝鮮大學校 建設技術硏究所 1998 建設技術硏究 Vol.18 No.2

In this study a plastic settlement analysis of breakwater is performed on geotechnical problems that can be developed during construction of a breakwater in Deukam habor, Yaksan, Wando Island. The fact that plastic settlement was not considered in design, induced big difference of the structure settlement between prediction and observation. Stresses within soil was evaluated by the computer program developed by New York State Transportation Bureau, and the ultimate bearing capacity by Terzaghi's theory. Mandel & Salencon's method was adapted for the coefficient of bearing capacity(Nc) of soft clay. The prediction of consolidation settlement was neglected because remaining clayey layer after plastic settlement was not thick. The extracted results from the analysis in this study were compared with that from the original design and in-situ check boring values. The main results are summarized as follows : (1) The evaluation of plastic settlement using the program should good accordance with actual settlement as a result of check boring. (2) The difference of 8% is found out for the settlement between the program and Osterberg's method. (3) The factor of safety for the slope analysis is evaluated greater after plastic settlement than before settlement. (4) The adaptation between general shear failure and local shear failure is dependent on the plastic index : As for clayey foundation of 20 ≤ PI ≤ 40 such as this case study by mid-lines between the two kinds of settlements are evaluated satisfactory. Slope stability was analyzed after the construction of breakwater.

보강토옹벽의 신뢰성 해석에 관한 연구

심태섭,주승완,정용운 朝鮮大學校 建設技術硏究所 1998 建設技術硏究 Vol.18 No.1

Current reinforced erath retaining wall design is bared on limit equilibrium analysis, but the reliability based design method is more rational than limit equilibrium analysis. For this reason, this study proposes a reliability based design criteria for the reinforced earth retaing wall, and also proposes the theoretical bases of nominal safety factors of stability analysis by intrducing the reliability theory. The limit state equations of stability analysis and design of each part of reinforced earth retaining wall are derived and the uncertainly measuring algorithms of each equations are also derived by external stability analysis and internal stability analysis of reinforced earth retaining wall. As a result, the target reliability indeces(overturning:βo=3.27,sliding:βo=2.47, bearing capacity:βo=1.94, tie-back:βo=3.26) are selected as optimal values considering our practice based on calibration with the currenr reinforced earth retaining wall design safety provisions. Load and resistance factors are measured by using the proposed uncertainties and the selected target reliability indices. Furthermore, a set of norminal safety factors (over turning: FS=2.07, sliding: FS=1.87, bearing capacity: FS=1.92, tie-back: FS=1.89) are proposed for the reinforced earth retaining wall current design safety provisions.

지반굴착에 따른 인접지반의 침하에 관한 연구

심태섭,주승완,조진옥 조선대학교 국토개발연구소 1996 국토개발연구 Vol.16 No.1

Recently, the rapid industiralization and urbanization of the country due to a high economic growth requires optimization of and usage as well as the expansion of underground space. 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 distance of settliment and settlement based on the measurting results which were obtained from two excavation construction fileds. The horizontal displacement were measured by inclinometers which were installed in soil behind the excavation walls.

PDA를 이용한 말뚝의 지지력에 관한 연구

심태섭,주승완,최성열 朝鮮大學校 建設技術硏究所 1999 建設技術硏究 Vol.19 No.2

When we make a civil construction of a lots models of architecture and building, there is coming into operation as a number of pile static and dynamic pile load test. And also it is taking the first consideration static loading to use loading methods of dead load, reaction pile and anchor. However, it is fact the pile load test sets up only for one target Because price and time which made extremely of a little constructed pile. And it does not have methods which decided permit load of foundation pile from the results of dynamic loading test. On the contrary, Pile Driving Analyzer can not even investigate the pile of whole bases that include driving construction drivability of pile, fitness of driving equipments, the soil condition, be rising pile owing to construct group pile, displacement change of bearing capacity's for pile following by the time elapsed, as well as judge all of subject but also it is able to manage of driving to gain a little bearing capacity's unless the pile damage somethings to incite decide without the object to determine of bearing capacity. It is possible for driving management and judge to fitness. It is able to inciting driving equipment and system, pile fit assembling. And able to get rid of an average error about arising of driving modeling or efficiency deduction. That is why using pile's input data of power an3 speed. On this research, it divided PCø400 (the first site) 4 place of spot piles and PHCø 400 (the second, third site) 4 place of spot PHC piles out of 8 piles load test 3 place of spot by using PDA. And then we earned conclusion by comparison and analysis about pile's ultimate bearing capacity, skin friction resistance range and volume, end bearing resistance, allowable bearing capacity, settlement by using CAPWAP, Davisson, Case method. The conclusion is as following. 1) The CASE method's numerical value of pile's ultimate bearing capacity is a little more than CAPWAP's analysis. the scope is 516% degree. 2) The rate of Divided safety factor allowable bearing capacity numerical value is turned out 1-11% more than the rate of total safety factor allowable bearing capacity. 3) Allowable bearing capacity numerical value by CAPWAP's analysis is 67% of allowable bearing capacity numerical value by Davisson method.

건설공사현장의 안전관리에 관한 연구

정남선,주승완,윤선호 서강정보대학 1999 산업과학연구 Vol.1 No.-

To live in good health is man's earnest wish. The degree of exposure to danger is deepened with the improvement of people's standard of living. Under the current situation where there increases the national demand for safety and health improvement, the sense of responsibility for safety security should be emphasized and be practised in industrial fields, homes, schools, and offices in order to strengthen the national infrastructure for the prevention of disaster and to prevent the safety accident effectively. The frequent disasters of falling in construction fields is primarily due to the lack of safety consciousness and knowledge of both proprietors and laborers, which resulted in the qualitative lowering of work and safety accidents. To prevent disasters, safety security is required through the consolidation of standards for safety equipment and structure installment. The highest frequency of disaster is found at the processing rate of 61~100%. Therefore this study has tried to make safe and comfortable working environment, and to construct better workplace which secures the safety and health of workers by tracing the causes of accident, taking the preventive measure, analyzing the cause of disaster with the statistical date of construction related to disaster, and suggesting the improvement methods, in order to reduce the loss of lives and properties.