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PROPOSAL OF REASONABLE CONSTRUCTION MANAGEMENT INDEX IN FLVCM BASED ON FEM ANALYSES

PROPOSAL OF REASONABLE CONSTRUCTION MANAGEMENT INDEX IN FLVCM BASED ON FEM ANALYSES. ○M. Shahiduzzaman Ph.D Student Graduate School of Science and Technology Y. Tanabashi Professor Faculty of Engineering Y. Jiang Professor Faculty of Engineering

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PROPOSAL OF REASONABLE CONSTRUCTION MANAGEMENT INDEX IN FLVCM BASED ON FEM ANALYSES

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  1. PROPOSAL OF REASONABLE CONSTRUCTION MANAGEMENT INDEX IN FLVCM BASED ON FEM ANALYSES ○M. Shahiduzzaman Ph.D Student Graduate School of Science and Technology Y. Tanabashi Professor Faculty of Engineering Y. Jiang Professor Faculty of Engineering S. Sugimoto Assistt. Professor Faculty of Engineering 08 November 2008 Nagasaki University, Japan

  2. Proposal a reasonable construction management index into the FLVCM Outline and Purpose of the Present study ① Numerical simulation regulated by FEM of Fill Loading with Vacuum Consolidation Method (FLVCM) and fill construction on the soft ground ②．Consideration and comparison with each construction method of the ground deformation behavior ③．Carried out of technique for understanding deformation behavior of soft ground on the site

  3. Two-dimensional Analyses Model Field ( vacuum consolidation method) of Saga prefecture, Japan (Nov. 2003~)

  4. Analytical Model and Input Parameters L.E: Linear elasticity model, S.O: Sekiguchi-Otha model • Mechanic constant; Similar to surrounding soil layer • Coefficient of permeability；1.0×10-2(cm/sec) • Vertical drain materials

  5. Depth – 3.5m Depth-8.0m Verification of Model Analysis Settlement Elapsed Time (days) Vacuum consolidation Similar tendency Settlement(cm) Field 2.4m from center Model Pore Water Pressure Vacuum consolidation Similar tendency Pore Water Pressure (kPa) Model Field

  6. Analysis Cases Condition Method 25 10 FCM: Fill Construction Method, VCM: Vacuum Consolidation Method, FLVCM: Fill Loading with Vacuum Consolidation Method

  7. Amount of Soil Deformation • VS:Surface Settlement • Vδ :Depth distribution of lateral displacement

  8. FLVCM : Vs’＞Vδ’ Superior Settlement Consolidation deformation Settlement Vs’＝S×B(m3 /m) Lateral Flow Vδ’=δ×H/2(m3 /m) • FCM : Near the un-drain responseShear deformation Relation between Settlement versus Lateral Flow Undrain Response Vs’＝ Vδ’ • VCM : Vδ’ Increases negatively as a lateral shrinkage

  9. Introduced the standard into the S－δ relation figure Attention to Loading of Vacuum Pressure Change to loading of vacuum pressure -20kPa ～ -90kPa VCM technical material Evaluation stability by horizontal displacement speed of fill edge point (Δδ/Δt ≤ 15～20 mm/day)

  10. Loading of Vacuum Pressure (Case Study) Condition Method ※V: Fill Loading with Vacuum Consolidation method

  11. ＝15mm/day 1.3m from edge point Horizontal Displacement Speed During the Fill Construction Area of exceed the standard Fill speed 20cm/daySatisfy the standard Fill speed 50cm/dayVacuum pressure less than -60kPa exceed the standard

  12. 非排水応答 Undrain response δ S S－δ relation straight line Lateral flow allowance line S=7.2δ • Fill speed 20cm/day Satisfy the standard and superior settlement Relation between Settlement and Lateral Displacement

  13. 非排水応答 Un-drain response δ S Lateral flow allowance line S =7.2δ Fill speed 50cm/day and vacuum pressure less than -60kPa Lateral flow is superior Relation between Settlement and Lateral Displacement S－δ relation straight line Lateral displacement δ (m)

  14. Summary 1)Utility of FLVCM (during the fill construction)  Excess pore water pressure is controlled  Promotion of consolidation settlement  Control of lateral spreading behavior 2) Proposal of construction management index  Lateral flow allowance line is introduced into the relation of settlement and lateral displacement  Possibility of construction management is suggested by relation of settlement and lateral displacement

  15. Thank you for your attentions

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