• Title/Summary/Keyword: soil settlement

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Finding an Archetypal Landscape of Yongdam Village Conformity with Traditional Region Theories (전통지역이론(傳統地域理論)에 준거(準據)한 용담면(用潭面)의 주거경관상(住居景觀相))

  • Huh, Joon;Rho, Jae Hyun
    • Journal of Korean Society of Rural Planning
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    • v.5 no.1 s.9
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    • pp.87-94
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    • 1999
  • The purpose of this study is to find through the algorithm of traditional region theory how nature has been recognized and occupied and harmoniously used by human beings. As seen Korean traditional villages, the natural elements such as mountains and streams in Yongdam are more remarkable than the artificial elements. The people in the village regards a radius of 4-12 km as their territory and an ideal space harmonized with natural landscape. The landscape structure of Yongdam shows traditional fengshui form and has a all the characteristics that Korean rural villages have. The landscape elements, such as mountains, rivers, plains, trees, soil color, etc. characterize Yongdam village and make the landscape of Yongdam a unique place. Traditional region theory is to study an emotional reaction to the quality of life, and landscape of a settlement. And it should be a basic theory to understand the whole landscape.

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The Study on permeability enhancement in smear zone using electro-osmotic pressure (전기 삼투압을 이용한 교란영역의 투수성 개선에 관한 연구)

  • Ahn, Byung-Wook;Noh, Hee-Jeon;Kim, Hyun-Ki;Cho, Nam-Jun
    • Proceedings of the Korean Geotechical Society Conference
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    • 2008.03a
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    • pp.435-441
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    • 2008
  • More time is required for consolidating soft clay when its hydraulic conductivity around the vertical drains is reduced by soil disturbance. One of the methods to be proposed to solve such problem is the electro-osmotic flow application. This study presents the experimental results of model tests using a modified oedometer and a large-scale cylinder with a sand drain. Results show that the development of negative excessive pore water pressure due to the DC electrical field in saturated clay can be transformed to additional loads causing more consolidation settlement.

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Study on Constructibility considering Changes of Groundwater Level in Kwang Yang port (광양지역 지하수위 변화를 고려한 시공성에 관한 연구)

  • Kim, Byeong-Ho;Yang, Tae-Seon;Lee, Song
    • Proceedings of the Korean Geotechical Society Conference
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    • 2006.03a
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    • pp.1120-1125
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    • 2006
  • Larger area will be constructed in a harbor land and container terminal which are constructed in reclaimed land using the dredged materials. Soil improvement work is to be carried out including constructibility, in which is monitoring devices, measuring frequency, installations etc. The ground water tables in the reclaimed area are affected by the several factors which are design reclamation level, consolidation settlement, remaining surcharge pressure and remaining excess pore water pressure. The plan wii be drawn up in which monitoring results for the ground water tables are capable to provide the reliable ground water table when designers and civil engineers construct the harbor structures considering constructibility.

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A Study on the PVDs Consolidation Degree Considering In-Situ Conditions (현장조건을 고려한 PVDs의 압밀도 산정에 관한 연구)

  • Shin, Eun-Chul;Park, Jeong-Jun;Kwon, Hyeung-Taek
    • Proceedings of the Korean Geotechical Society Conference
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    • 2006.03a
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    • pp.824-827
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    • 2006
  • The Prefabricated Vertical Drains (PVDs) method is one of the most widely used techniques to accelerate the consolidation process in-situ and hence increase its bearing capacity. In this paper, the degree of consolidation incorporated with PVDs was evaluated in O construction work site which composed with dredged soil. O Program PVD(Version 2.3) which developed by Asian Institute of Technology was used. The purpose of this analysis is efficiently to estimate the degree of consolidation by analyzing the surface settlement with time, and drainage at initial stage and final stage by using design-parameter which based on the in-situ tests and laboratory tests. This result can be compared with analysis of the degree of consolidation using Program PVD(Version 2.3) and the field observed data in the future studies.

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Stability evaluation of foundation settlement of power transmission tower (송전철탑의 기초침하에 대한 안정성 평가)

  • Lee, Dae-Soo;Cho, Hwa-Kyung;Kim, Dae-Hong;Ham, Bang-Uk
    • Proceedings of the Korean Geotechical Society Conference
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    • 2005.03a
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    • pp.687-696
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    • 2005
  • Safety diagnosis was conducted to evaluate the long-term stability evaluation of power transmission tower of which deformation of the upper structural elements occurred. To assess the cause of the structural deformation, field investigation including BIPS, down-hole test, concrete pile coring and finite element analysis were carried out. From these studies, the major cause of deformation was found due to the heavily fractured layer and weathered soil topography at the pile tip area. The cement-milk grouting method was proposed to reinforce these weak zone around the pile tip area. Also, the increase of cross-section and stiffness for steel members of upper tower structures was suggested. Instrumental monitoring was proposed as well to verify reinforcing effect.

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A Field Test Study on stress concentration ratio of Crushed-Stone Column Pile (쇄석다짐말뚝의 응력분담비에 관한 현장실험 연구)

  • Lee, Min-Hee;Im, Jong-Chul;Hwang, Geun-Bae;Choi, Yong-Kyu
    • Proceedings of the Korean Geotechical Society Conference
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    • 2004.03b
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    • pp.525-532
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    • 2004
  • Among soft ground treatment methods with granular soil used in domestic, the sand compaction pile method has been utilized greatly, but, as a result of exhaustion of sand and increase of unit cost, a necessity of an alternative method is suggested. In this study, the static load tests for crushed-stone compaction piles which were constructed on test field were performed. Based on test results, stress concentration ratios between the crushed-stone compaction pile and the soft ground were investigated and estimated. The stress concentration ratio was the range of 1.7 to 3.0 and the higher it was the more replacement rate was increased.

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An Application study for corrugated structural plate under the railway (철도하부 통과 구간의 파형강판의 적용성 검토 연구)

  • Roh, Byoung-Kuk;Kim, Hung-Do;Oh, Kyung-Jun
    • Proceedings of the KSR Conference
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    • 2007.05a
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    • pp.1424-1430
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    • 2007
  • Corrugated structural plate is ductile structural member which has high sectional properties compared with same thickness of plate. Corrugated plate resists the external forces by the combined action of retained soils and structures. Since it is easy to transport and assemblage of in-situ, the duration and cost of construction can be reduced. Corrugated plate structures, therefore, are widely used in culverts, hydro passages and simple bridges. RC culvert with supported by unstable soil layersin railway construction project of pohang${\sim}$samchuk has been replaced by corrugated plate culvert due to the reduction of construction duration and cost, especially the performance of behavior of settlement of ground. The structural analysis, design processes, and the economic advantages of the corrugated plate culvert are studied in this paper.

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The Effects of Negative Pressure on Horizontal Drain Method (수명배수공법에 있어서 부압의 영향에 관한 실험적 연구)

  • 김정기;김지용;정승용;김수삼
    • Proceedings of the Korean Geotechical Society Conference
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    • 2001.03a
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    • pp.551-558
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    • 2001
  • The horizontal drain method is one of methods improving reclamation ground. This method reduces consolidation time by using drained installed horizontally, and negative pressure is applied on end of these drains by vacuum pump. But, effective negative pressure still wasn't evaluated in applying this method to reclamation ground. To estimate optimum negative pressure, soil box test that make a model the in-situ by installing horizontal drains in the center is performed pressing different vacuum pressure In the laboratory, and the variations in settlement and volume of drained water through the drains during consolidation process were measured. Also, water content with distance from drain and with depth is measured after the test.

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A Model Test Study on the Bearing Capacity of the Crushed Stone Pile (쇄석말뚝의 지지력 특성에 관한 모형시험 연구)

  • 이상익;박용원;김병일;윤길림
    • Proceedings of the Korean Geotechical Society Conference
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    • 2001.03a
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    • pp.299-306
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    • 2001
  • Crushed Stone Pile(CSP) is one of the ground improvement methods available to loose sand and clayey ground by forming compacted CSP in the weak soil layer. The effects of this method are enhancement of ground bearing capacity, reduction of settlement and prevention of lateral ground movement in cohesive layer, reduction of liquefaction potential in sandy ground. This study performs model tests in 1.0m${\times}$1.0m${\times}$1.0m and 1.5m${\times}$1.5m${\times}$l.2m model tank to observe bearing capacity of CSP treated ground. The area replacement ratio of CSP composite ground varies 20%, 30% and 40% with square grid pattern. After the composite ground was consolidated under pressure of 0.5kg/$\textrm{cm}^2$ and 1.0kg/$\textrm{cm}^2$, load tests were carried out. The results show that ultimate bearing capacity increases with area replacement ratio and the preconsolidation pressure of ground.

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Characteristics of Ground Improvement by Compaction Grouting System in Filled Ground (매립토층에서 CGS에 의한 지반개량특성에 관한 연구)

  • 천병식;여유현;정영교;정완균;정의원;김우종
    • Proceedings of the Korean Geotechical Society Conference
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    • 2001.03a
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    • pp.425-432
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    • 2001
  • Compaction Grouting System, the method which makes ground compact by injection of low slump mortar, Is widely used for reinforcement of soft ground, restoration of structures happened differential settlement, underpinning and restoration of damaged dam core. The quantitive analysis of ground improvement for this method has not performed yet. So, design parameters about thls method must be studied through performance of CGS in various types of soil to make CGS adaptable widely. In this study PBT, SPT and field density test were performed for analysis of the characteristics of ground improvement and pressuremeter and inclinometer were installed for analysis of the characteristics of compaction in adjacent ground. In this paper, denoted much effects for filled ground that increasing of the bearing capacity, confirming the displacement of adjacent ground and the effective radius of injection.

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