• 제목/요약/키워드: Mud-pumping

검색결과 24건 처리시간 0.028초

철도 노반분니 현상에 대한 연구 (Research of the Mud-Pumping Phenomena on Railway Trackbed)

  • 김대상;이진욱;신민호;권병성
    • 한국철도학회:학술대회논문집
    • /
    • 한국철도학회 2004년도 춘계학술대회 논문집
    • /
    • pp.987-993
    • /
    • 2004
  • The status of mud-pumping in the existing railroad lines were investigated and real-scale tests simulating mud-pumping phenomena were carried out to analyze its mechanism. The penetration of ballast material into the subgrade and the cause of mud-pumping are explored. The results of the investigation and tests will be used to develop the new method and materials for the prevention of mud-pumping.

  • PDF

SASW 실험에 의한 철도 분니현상의 규명 (Identification of Mud-Pumping Mechanism by SASW Measurements)

  • 강태호;조성호;황선근;이성혁
    • 한국지반공학회:학술대회논문집
    • /
    • 한국지반공학회 1999년도 봄 학술발표회 논문집
    • /
    • pp.463-470
    • /
    • 1999
  • The railroad transportation system has more advantages over other transportation systems in terms of low cost, safety and mass transportation The development in economy and social environments lead to the increase of the transportation between cities. As a result, the increased capacity of transportation system is required and maintenance of transportation facilities becomes more important, In the railroad system mud-pumping is one of the troubles to cause distortion of rails and progressive disrupture of subgrade. h this study, SASW measurements were performed to investigate stiffness structures at the sites with mud-pumping and without mud-pumping, Comparison of the stiffness structures revealed the mechanism of mud-pumping and provided information to choose measures for the mud-pumping.

  • PDF

분니가 발생한 철도 노반토의 역학적 특성 (Mechanical Characteristics of Railway Subgrade Materials Experiencing Mud-Pumping)

  • 목영진;황선근;이성혁
    • 한국지반공학회:학술대회논문집
    • /
    • 한국지반공학회 1999년도 봄 학술발표회 논문집
    • /
    • pp.415-422
    • /
    • 1999
  • A series of crosshole tests was conducted to evaluate the mechanical characteristics of railway subgrade materials which has been experiencing mud-pumping. The shear wave velocity profiles of mud-pumped sites were compared with those of adjacent intact sites. The shear wave velocities of mud-pumped layers are less than 150 m/sec.

  • PDF

The characteristics of subgrade mud pumping under various water level conditions

  • Ding, Yu;Jia, Yu;Wang, Xuan;Zhang, Jiasheng;Luo, Hao;Zhang, Yu;Chen, Xiaobin
    • Geomechanics and Engineering
    • /
    • 제30권2호
    • /
    • pp.201-210
    • /
    • 2022
  • This paper presents a study regarding the influence of various water levels on the characteristics of subgrade mud pumping through a self-developed test instrument. The characteristics of mud pumping are primarily reflected by axial strain, excess pore water pressure, and fine particle migration. The results show that the axial strain increases nonlinearly with an increase in cycles number; however, the increasing rate gradually decreases, thus, an empirical model for calculating the axial strain of the samples is presented. The excess pore water pressure increases rapidly first and then decreases slowly with an increase in cycles number. Furthermore, the dynamic stress within the soil first rapidly decreases and then eventually slows. The results indicate that the axial strain, excess pore water pressure, and the height and weight of the migrated fine particles decrease significantly with a low water level. In this study, when the water level is 50 mm lower than the subgrade soil surface, the issue of subgrade mud pumping no longer exist.

토목섬유를 활용한 철도 연약노반에서의 보강효과 (A Study on Reinforcement Effectiveness for Railway Soft Roadbed by Using Geotextiles)

  • 이진욱;최찬용
    • 한국지반공학회:학술대회논문집
    • /
    • 한국지반공학회 2005년도 춘계 학술발표회 논문집
    • /
    • pp.1546-1553
    • /
    • 2005
  • In this study, geotextiles was applied on the selected track-bed, which is relatively economical and efficient way to prevent the problem of mud-pumping and settlement. Field testing sections from Mock-haeng to Dong-ryang in the Chung-buk lines in Korea were selected to investigate the state of track and roadbed. And three places were chosen among 1,700 spots where mud-pumping was frequently occurred and maintenance required. At the curved section with radius of 500m between Mock-haeng and Dong-ryang, we divided this testing site into 5 section and 4 different types of geotextile were installed and left the last section with no reinforcement. Total length of the test site was 200m and individual length of each site was 40 m. In order to understand the state and the strength of prepared roadbed, stiffness and physical properties of the roadbed soil were evaluated and analyzed. Also, after the installation, mud-pumping, settlement of elastic or plastic sleeper, failure of track, wheel-loads, lateral force and earth pressures were investigated.

  • PDF

현장부설시험구간에서의 장기계측을 통한 토목섬유 보강효과 (A Study on Reinforcement Effectiveness for Railway Soft Roadbed through Long-Term Instrumentation on the Field Test)

  • 최찬용;이진욱
    • 한국철도학회:학술대회논문집
    • /
    • 한국철도학회 2005년도 춘계학술대회 논문집
    • /
    • pp.734-743
    • /
    • 2005
  • In this study, geotextiles was applied on the selected track-bed, which is relatively economical and efficient way to prevent the problem of mud-pumping and settlement. Field testing sections from Mock-haeng to Dong-ryang in the Chung-La lines in Korea were selected to investigate the state of track and roadbed. And three places were chosen among 1,700 spots where mud-pumping was frequently occurred and maintenance required. At the curved section with radius of 500m between Mock-haeng and Dong-ryang, we divided this testing site into 5 section and 4 different types of geotextile were installed and left the last section with no reinforcement. Total length of the test site was 200m and individual length of each site was 40 m. In order to understand the state and the strength of prepared roadbed, stiffness and physical properties of the roadbed soil were evaluated and analyzed. Also, after the installation, mud-pumping, settlement of elastic or plastic sleeper, failure of track, wheel-loads, lateral force and earth pressures were investigated.

  • PDF

실내 모형반복실험에 의한 철도노반재료의 성능 평가 (Evaluation of Performance of the Railroad Roadbed Material by Model Fatigue lest)

  • 황선근;이성혁;이시한;최찬용
    • 한국지반공학회:학술대회논문집
    • /
    • 한국지반공학회 2000년도 봄 학술발표회 논문집
    • /
    • pp.191-198
    • /
    • 2000
  • Dynamic fatigue test is carried out using soil model box for the evaluation of performance of three different roadbed materials. Bearing capacity, settlement and mud pumping phenomenon of each roadbed materials as well as penetration of model ballast into the roadbeds are investigated. It was found that settlement of slag and crushed stone roadbed is smaller than the soil roadbed during dynamic fatigue test with same initial conditions.

  • PDF

시추용 머드혼합탱크의 비뉴턴 유체 모델에 대한 교반성능의 수치해석적 연구 (Numerical Study of Agitation Performance in a Drilling Mud Mixing Tank to Non-Newtonian Rheological Properties)

  • 임효남;이희웅;이인수;최재웅
    • 한국유체기계학회 논문집
    • /
    • 제17권6호
    • /
    • pp.29-37
    • /
    • 2014
  • Non-Newtonian fluid mechanics takes charge of an important role in the oil industries. Especially in the oil well drilling process, the drilling fluid such as mud keeps the drill bit cool and clean during drilling, with suspending drill cuttings and lubricating a drill bit. The purpose of this study is to examine the effect of fluid mud rheological properties to predict different characteristics of non-Newtonian fluid in the mud mixing tank on offshore drilling platforms. In this paper, ANSYS fluent package was used for the simulation to solve the hydrodynamic force and to evaluate mud mixing time. Prediction of the power consumption and the pumping effectiveness has been presented with different operating fluid models as Newtonian and non-Newtonian fluid. The comparison between Newtonain mud model and non-Newtonian mud model is confirmed by the CFD simulation method of drilling mud mixing tank. The results present useful information for the design of the drilling mud mixing tanks and provide some guidance on the use of CFD tool for such non-Newtonian fluid flow.

영업선상에서 분니 억제를 위한 자갈치환 공법과 토목섬유 보강공법 비교연구 (A Comparison Between the Ballast Replacement Method & Geosynthetics-Reinforced Method for Restraint of Mud Pumping in Service Line)

  • 최찬용;이진욱;김대상
    • 한국지반신소재학회논문집
    • /
    • 제6권4호
    • /
    • pp.21-28
    • /
    • 2007
  • 실제 영업선에서 분니가 자주 발생되는 구간을 선정하여 현재 분니 대책공법으로 많이 사용하고 있는 도상자갈치환방법과 토목섬유 보강공법에 대하여 약 3년간 육안조사를 실시하여 분니 발생 여부를 관찰하였다. 토목섬유로 보강된 단면이 도상자갈 치환방법보다 상당히 장기간에 걸쳐 분니를 억제하는 효과와 분니 억제를 위한 토목섬유 부직포의 중량은 최소 $330N/m^2$ 이상을 만족하는 재료로 선정하여야 효과가 있는 것을 확인할 수 있었다. 또한, 실제 열차하중이 작용하는 도상자갈 하부(침목하면으로부터 약 35cm)에서의 지오그리드의 횡 종방향 인장변형율(%) 범위는 각 각 0.0078~0.0385%와 0.016~0.1211%으로 종방향 인장변형율이 횡방향 인장변형율보다 약 10배 이상 큰 값을 보였다.

  • PDF

연약노반상에서의 토목섬유 적용에 따른 보강효과 분석 (Analysis of Reinforcement Effect with Geotextile types on Soft Ground)

  • 이진욱;최찬용;이성혁
    • 한국철도학회논문집
    • /
    • 제9권1호
    • /
    • pp.69-75
    • /
    • 2006
  • In this study, Several types of geotextile was used on the selected track-bed. The use of geotextile prove a economical and efficientmean to prevent the problem of mud-pumping and settlement. Field testing sections from Mock-haeng to Dong-ryang in the Chungbuk lines in Korea were selected to investigate in current condition the of track and roadbed. This testing site was divided into 5 sections. In the four sections, different types of geotextiles were installed. In order to estimate for performance of the reinforced section with geotextiles on the soft ground, four different geotextiles were installed and compared with no reinforced section. Also, after the installation, mud-pumping, settlement of elastic or plastic sleeper, failure of track, wheel-loads, and earth pressures were investigated. The following is the summaries from the field tests. As a conclusion, According to naked eyes investigation, mud pumping didn't happen at reinforced sections, but no reinforced section was happen to a top of track for 6 months. And Elastic displacements at the reinforced and no reinforced section were about $30.7\%\;and\;73.8\%,$ respectively. Also, It was found that plastic displacement in reinforced section was retrained about $50\%$ more than that in no reinforced section.