• Title/Summary/Keyword: 지반안정성

Search Result 1,588, Processing Time 0.022 seconds

Geotechnical Properties of Sandy Tidal Flat and Stability of Artificial Tidal Flat (모래질 갯벌의 지반공학적 특성 및 인공갯벌의 안정성)

  • 권오순;장인성;이광수;염기대
    • Journal of Korean Society of Coastal and Ocean Engineers
    • /
    • v.15 no.2
    • /
    • pp.127-137
    • /
    • 2003
  • The researches on the construction of artificial coastal wetlands have been progressed in order to cope with the situation that the area of Korean tidal flat has been reduced due to several coastal developments This study, as a part of the project on construction of the artificial tidal flats, deals with the comparison of the geotechnical characteristics between natural tidal flat and artificial tidal flat, and is also focused on the stability analysis of tidal flats. Various laboratory tests were performed using disturbed and undisturbed samples, which were obtained from a sandy tidal flat in Korea. The stability of the sandy soils accumulated on the tidal flat was investigated by comparing the shear strength of soil evaluated from laboratory test with induced shear stress due to both current and wave action.

Theoretical approach for ground behaviour during tunnelling in soils (토사터널굴진시 지반거동에 대한 이론적 접근에 대한 연구)

  • Kim, Sang-Hwan
    • Journal of Korean Tunnelling and Underground Space Association
    • /
    • v.5 no.4
    • /
    • pp.301-312
    • /
    • 2003
  • This paper considers the stresses and pore pressures induced in soft ground due to tunnelling and it presents and discusses the approach methods for estimating the stability of the tunnel and its heading during drained and undrained condition. In practical, the undrained analyses of the face stability of shield tunnelling in soft soil, are carried out based on the field data measured during tunnelling and the results are also evaluated.

  • PDF

A Study on the Probabilistic Stability Analysis of Slopes (확률론적 사면안정 해석기법에 관한 연구)

  • Kim, Ki-Young;Cho, Sung-Eun
    • Journal of the Korean Geotechnical Society
    • /
    • v.22 no.11
    • /
    • pp.101-111
    • /
    • 2006
  • Slope stability analysis is a geotechnical engineering problem characterized by many sources of uncertainty. Some of them are connected to the variability of soil properties involved in the analysis. In this paper, a numerical procedure of probabilistic analysis of slope stability is presented based on Spencer's method of slices. The deterministic analysis is extended to a probabilistic approach that accounts fur the uncertainties and spatial variation of the soil parameters. The procedure is based on the first-order reliability method to compute the Hasofer-Lind reliability index and Monte-Carlo Simulation. A probabilistic stability assessment was performed to obtain the variation of failure probability with the variation of soil parameters in homogeneous and layered slopes as an example. The examples give insight into the application of uncertainty treatment to the slope stability and show the impact of the spatial variability of soil properties on the outcome of a probabilistic assessment.

Stability Evaluation Along Interface Loss of a Foundation and the Ground (기초와 지반의 접촉면 손실에 따른 지지력 안정성 평가)

  • Kim, Sang-Hwan;Ji, Tal-Oh
    • Journal of the Korea institute for structural maintenance and inspection
    • /
    • v.14 no.3
    • /
    • pp.178-185
    • /
    • 2010
  • This paper presents the evaluation of foundation stability according to decrease of the foundation contact area on the ground. In order to carry out this research, the experimental and numerical studies are performed. In the experimental study, the carefully controled laboratory model tests are carried out with different foundation size and types. The model test results are analyzed and interpreted by analytical and numerical calculation in order to verify both results obtained from experimental and numerical studies. It is clearly found from the results that the foundation stability is considerably reduced when the foundation contact area ratio is less than 75%. This research may be very useful to develop the economical foundation type.

Numerical Analysis on the Influence Factors of Cavity Occurrence in the Stability of the Underground with Cavity (도로 하부지반에서 발생된 공동이 지반 안정성에 미치는 영향에 관한 수치해석)

  • Nam, Jun-Hee;Kim, Jong-Chul;Lee, Kang-Il
    • Journal of the Korean Geosynthetics Society
    • /
    • v.21 no.1
    • /
    • pp.49-56
    • /
    • 2022
  • In this study, finite element numerical analysis was performed considering various influence factors(cavity shape and size, pavement thickness and size of traffic load) in order to analyze the impact factors in the underground of the road where the cavity occurred and to evaluate the stability of the ground. In order to verify the reliability of the numerical analysis method applied in this study and the results it was compared and analyzed with the results of previous studies and field measurements. The correlation between the influence factors was analyzed through the distribution of vertical displacement obtained from the numerical analysis results, the distribution of surface settlement and surface settlement, the distribution of the stress ratio, and the distribution of the safety factor. As a result, it was confirmed that as the size of the cavity and traffic load increased and the thickness of the pavement decreased, the vertical displacement and surface settlement at the top of the cavity increased. Also, the shape of the cavity was square, the stability of the ground was significantly reduced compared to the case of a circular cavity. Through these results, it was possible to confirm the overall stability of the lower ground of the road where the cavity was generated.

Numerical Stability Evaluation of Underground Semi-Spherical Cavity (반구형 지중공동의 수치해석적 안정성 평가)

  • Lee, Taegeon;Ryu, Dong-Woo;Youn, Heejung
    • Tunnel and Underground Space
    • /
    • v.32 no.1
    • /
    • pp.20-29
    • /
    • 2022
  • The existence of underground cavity should be considered in the assessment of georisk such as ground subsidence. Even if the shear strength of the ground around the cavity is known, it is difficult to accurately analyze the safety around the cavity due to the uncertainties related to geometric conditions such as the cavity size. In this paper, stability chart representing dimensionless stability constants was proposed based on the ground strength and geometric conditions. Numerical analysis had been carried out accounting for the stability constants such as the ground strength, the adhesion and friction angles, and the size and depth of the underground cavity. The proposed charts can help estimating the stability of ground with underground circular cavity.

A Design Method of Earth-Retaining Structure Constructed by a Row of Bored Piles in Cohesive Soils (점성토지반속 주열식 흙막이벽의 설계법)

  • Hong, Won-Pyo;Gwon, U-Yong;Go, Jeong-Sang
    • Geotechnical Engineering
    • /
    • v.5 no.3
    • /
    • pp.29-38
    • /
    • 1989
  • A design method is presented for the earth-retaining structure ccnslructtd by a row of bored Piles, which has such merits as low-vibration and low-noire during construction. And utility of the design method is investigated by performing a design example. First, theoretical rquations to estimate the resisting force of a row of earth-retaining was in cohesive soils are estabilished for grounds above and below bottom of excavation, reprctively. The characteristics of soils and the effect pile's interval can be considered logically in the theoretical equations. Then, the method for stability.analysis is presented for the earth-retaining piles by applying the theoretical equation of resisting forces on a row of piles. Finally, the design of earth-retaining piles is performed within the ranges which can satisfy the stabilities of both piles and soils. On investigation cf the sail-stability, the stability for bottom heave In cohesive soils is also investigated.

  • PDF

Analysis of Measurement Data for Stability of Seashore Waste Landfills (해안 폐기물매립지 안정을 위한 계측자료 분석)

  • Jang, Yeon-Soo;Choi, Jong-Sig;Ryu, Hye-Rim;Kim, Dong-Hyun
    • Proceedings of the Korean Geotechical Society Conference
    • /
    • 2008.03a
    • /
    • pp.947-954
    • /
    • 2008
  • Waste landfills built on weak soils have the possibilities of the failure of slope and foundation due to the disposed waste loads. To ensure the landfill will sustain its stability within a limited site area, it's necessary to investigate and understand the characteristics of soft land by identifying the requirements for waste filling and by quantitative field measurement and management of landfills. In this paper, the stability analyses are performed using the field measurement data of Gimpo #2 Metropolitan Landfil. For the stability analysis, Tominaga-Hashimoto method and Kuriharh method, which may be able to manage the stability of the landfill quantitatively, are used.

  • PDF

A Case Study on the Effects on Underground Structure due to Changes in the Groundwater Level and Ground Stress (지반응력 및 지하수위 변화가 지하철구조물 안정성에 미치는 영향 사례연구)

  • Chung, Jeeseung;Lee, Sungil;Lee, Kyuyoung;Jung, Haewook;Kim, Hongjoo
    • Journal of the Korean GEO-environmental Society
    • /
    • v.16 no.9
    • /
    • pp.13-21
    • /
    • 2015
  • Recently, land subsidence and sinkhole are generated due to a change in the groundwater level in the city. For this reason, the necessity for management of stable underground water level is on the rise. In this study, it was conducted for the underground structure that passes through the lower of bus transfer center construction site to examine the influence on the stability for underground structures to changes in the groundwater level and effective stress, the coupled finite element analysis and structural analyses were performed to evaluate stability for underground structure. It is to secure stability for underground structures according to underground water level declines. In this way, effective construction management will be made by previewing and forecasting the influence on the ground behavior and adjacent structures due to changes in the groundwater level.

A Study on the Applicability of Copper Slag as Drainage Material (산업폐기물인 동슬래그의 배수재로서의 활용에 관한 연구)

  • Chun, Byung-Sik
    • Journal of the Korean GEO-environmental Society
    • /
    • v.5 no.4
    • /
    • pp.65-72
    • /
    • 2004
  • Within a country, owing to the restriction of aggregate which have been supplied to construction sites, applicability of byproducts such as the copper slag is expected to be more reasonable. In this study, on the basis of characteristics, grain distribution and environmental stability of copper slag, its engineering application was estimated as the vertical and horizontal drainage material. As a results of laboratory tests, it was shown that the permeability of the copper slag was similar to that of sands under vertical drainage condition. In addition, the copper slag showed higher critical hydraulic gradient than that of sand under upward vertical flow state. The copper slag has potential safety against piping and it that the copper slag is suitable for drainage and filter material.

  • PDF