Course Content Introduction to PLAXIS 2D PLAXIS Input Mode: Geometry PLAXIS Input Mode: Calculations Cantilevered Sheetpile Wall: Input PLAXIS Output Mode Cantilevered Sheetpile Wall: Input Modelling of an Embedded Cantilevered Wall
INTRODUCTION TO PLAXIS 2D PLAXIS HK DATE: 24 OF FEBRUARY 2014 VENUE: HKMA, 2-4/F, Pico Tower, 66 Gloucester Road, Wanchai, Hong Kong PLAXIS ASIAPAC 16 Jalan Kilang Timor 05-08 Redhill Forum 159308, Singapore SOLUTION RESEARCH CENTER LTD Room 1601, 16/F, One Hysan Avenue, Causeway Bay, Hong Kong INTRODUCTION TO PLAXIS 2D Hong Kong Module HK PLAXIS HK 1 : INTRODUCTION TO PLAXIS 2D About this Course Objectives This course includes: Lectures (4) Demonstrations (2) Modelling exercise (1) Wh should Who h ld attend tt d New users Civil Engineers Geotechnical Engineers Geologists Prerequisite None Duration hours (1 Day) PLAXIS HK 1 : INTRODUCTION TO PLAXIS 2D HK 1: Modules Modules Subject Lesson HK 1-1 Introduction to PLAXIS 2D Lesson HK 1-2 PLAXIS Input Mode: Geometry Lesson HK 1-3 PLAXIS Input Mode: Calculations Demo HK 1-D1 Cantilevered Sheet-pile Wall: Input Lesson HK 1-4 14 PLAXIS Output O t Mode Demo HK 1-D2 Cantilevered Sheet-pile Wall: Input Modelling Exercise HK Modelling of an Embedded Cantilevered Wall PLAXIS HK 1 : INTRODUCTION TO PLAXIS 2D LESSON HK 1-1 INTRODUCTION TO PLAXIS 2D Duration : Content of this lesson: 30 minutes • PLAXIS Programs • PLAXIS Suite • PLAXIS Basic •Workflow of PLAXIS 2D •PLAXIS Knowledge Base PLAXIS HK 1 : INTRODUCTION TO PLAXIS 2D LESSON HK 1-2 PLAXIS Input Mode: Geometry Duration : Content of this lesson: 30 minutes •Plaxis Input and general settings Geometry mode •Geometry •Tool bars •Material data sets •Meshing and inspection PLAXIS HK 1 : INTRODUCTION TO PLAXIS 2D LESSON HK 1-3 PLAXIS Input Mode: Calculations Duration : Content of this lesson: 30 minutes •Introduction to Calculation mode General features •General •Setting up the simulation yp •Calculation types •Monitoring the calculation PLAXIS HK 1 : INTRODUCTION TO PLAXIS 2D DEMONSTRATION HK 1-1 Cantilevered Sheet-pile Wall: Input Duration : Content of this lesson: 60 minutes •Introduction to the problem Setting up the file •Setting •Setting up the model •Material data sets •Meshing and optimisation PLAXIS HK 1 : INTRODUCTION TO PLAXIS 2D LESSON HK 1-4 PLAXIS Output Mode Duration : Content of this lesson: 30 minutes •Introduction to Output mode General features •General •Results: Stresses g Moments •Results: Forces & Bending •Results: Displacements •Results: Tabulation of output data PLAXIS HK 1 : INTRODUCTION TO PLAXIS 2D DEMONSTRATION HK 1-1 Cantilevered Sheet-pile Wall: Output Duration : Content of this lesson: 60 minutes •Post-processing of model Displacements •Displacements •Forces •Cross-sections •Data tabulation PLAXIS HK 1 : INTRODUCTION TO PLAXIS 2D Modelling Exercise Modelling of an Embedded Cantilever Retaining Wall Duration : Content of this lesson: 90 minutes •Introduction to the exercise and model Model setup •Model •Material Input g •Meshing •Calculation •Results •Conclusions PLAXIS HK 1 : INTRODUCTION TO PLAXIS 2D Time-table for HK TIME MODULE SESSION 1: INTRODUCTION TO PLAXIS 2D 9:00 9:30 30 Lesson HK1-1 Introduction to Plaxis 2D 9:30 10:00 30 Lesson HK1-2 PLAXIS Input Mode: Geometry 10:00 10:30 30 Lesson HK1-3 13 PLAXIS S Input Mode: C Calculation 10:30 10:45 15 10:45 11:45 60 11:45 12:00 15 Q/A 12:00 1:30 90 Lunch Break Demonstration HK1 HK1-1 Cantilevered Sheet-pile p Wall model : Input p SESSION 2: INTRODUCTION TO PLAXIS 2D 1:30 2:00 30 Lesson HK1-4 PLAXIS Output Mode Demonstration HK1-2 C til Cantilevered d Sheet-pile Sh t il W Wallll model d l:O Output t t 00 2:00 00 3:00 60 3:00 3:15 15 3:15 4:45 90 4:45 5:00 15 Break Modelling Exercise Modelling of an embedded cantilevered wall HK1 Q/A PLAXIS HK 1 : INTRODUCTION TO PLAXIS 2D PLAXIS HK 1 : INTRODUCTION TO PLAXIS 2D PLAXIS 2D:Introduction 2D I t d ti Hong Kong Lesson HK1-1 Contents Program: g Work-flow Plaxis 2D: Input Plaxis 2D: Calculations Plaxis 2D: Output WORK-FLOW 1 Input • Definition of the physical model + mesh Calculation • Definition of initial conditions + construction stages Output • View results for individual phases in the entire model Introduction to PLAXIS 2D Introduction to PLAXIS 2D INPUT PLAXIS HK 1‐Introduction to PLAXIS 2D PLAXIS HK 1‐Introduction to PLAXIS 2D Project Properties PLAXIS HK 1‐Introduction to PLAXIS 2D Step 5: Boundaries & Surcharge Load PLAXIS HK1‐Exercise 1 Step 6: Prepare Material Sets (Soil) PLAXIS HK1‐Exercise 1 Step 7: Soil Parameters PLAXIS HK1‐Exercise 1 Step 8:Interfaces PLAXIS HK1‐Exercise 1 Step 9: Initial PLAXIS HK1‐Exercise 1 Step 10: D-Wall (Plate) PLAXIS HK1‐Exercise 1 Step 11:Insert Material PLAXIS HK1‐Exercise 1 Step 12: Meshing (Default Settings) PLAXIS HK1‐Exercise 1 Step 13: Check Mesh Nos PLAXIS HK1‐Exercise 1 Step 14: Check Mesh Quality PLAXIS HK1‐Exercise 1 Step 15 Save Your Work! & Move to CALCULATIONS PLAXIS HK1‐Exercise 1 STEP 16: CALCULATIONS PLAXIS HK1‐Exercise 1 STEP 17:Pick Points (Node & Stress Points) PLAXIS HK1‐Exercise 1 STEP 18: CALCULATE PLAXIS HK1‐Exercise 1 STEP 19: CALCULATIONS COMPLETED PLAXIS HK1‐Exercise 1 STEP 20: OUTPUT (DEFORMED MESH) PLAXIS HK1‐Exercise 1 STEP 21: DEFORMATION (VECTORS) PLAXIS HK1‐Exercise 1 STEP 22: DEFORMATION (Shadings) PLAXIS HK1‐Exercise 1 STEP 23: PLATE (BENDING MOMENTS) PLAXIS HK1‐Exercise 1 STEP 24: GROUND SETTLEMENT PLAXIS HK1‐Exercise 1 STEP 25: CURVE (Ux VS STEPS) PLAXIS HK1‐Exercise 1 DISCUSSION POINTS Soil Model A A B Modelling of Retaining Wall A B Plate Solid Hand Calculation vs Beam-Spring p g vs FEM A B C Mohr-Coulomb Mohr Coulomb Hardening Soil Model (Advanced Models) Hand Calculations (at Collapse, what about deformations) Beam-Spring (Single Excavation side, Soil?, Soil Deformation) FEM ( ) Stress-paths PLAXIS HK1‐Exercise 1 Soil Input Parameters for Analyses Parameters for soil strength & initial stress state Analyses Material Model c' (kN/m3) (kPa) MC 20 HS 20 HSsmall 20 ' (or ur) [-] 0.3 0.2 02 0.2 (Deg) 35 35 35 Rinter [-] 0.426 0.426 426 0.426 0.67 0.67 67 0.67 Parameters for soil stiffness prior to failure Analyses y Material Model MC HS HSsmall Eref (or E50 or Eoedref) (MPa) 30 30 30 ref Eurref pref m G0 0.7 (MPa) 90 90 (kPa) 100 100 [-] 0.5 0.5 (MPa) 150 [-] 2ì10-5 ã For derivation of soil stiffness parameters, - HS model from standard drained triaxial compression tests - HSsmall model from small-strain triaxial tests or field tests (e.g downhole / crosshole seismic survey) Pre‐failure Stress‐strain Behaviour 1: Mohr Coulomb 1: Linear elastic,, p perfectly y plastic p 2: Hyperbolic stress-strain curve (stiffness degradation for > 1E-4) 3: Non-linear Non linear stiffness from very small strains (1E-6) 3:Hardening Soil + Small Strain Overlay 2: Hardening Soil 1e-6 1e-5 1e-4 1e-3 1e-2 1e-1 32 Predicted Surface Settlement Behind Wall Distance behind wall (m) 10 15 20 25 30 0.006 Heave 0.004 Setttlement (m) 0.002 0.000 -0.002 -0.004 Settlement -0.006 MC HS -0.008 HSsmall -0.010 • MC predicts unrealistic surface heave mm • HS & HSsmall predict max surface settlement mm Predicted Heave at Exc Level Distance in front of wall (m) -5 -4 -3 -2 -1 0.025 MC 0.020 Wall He eave (m) 0.015 0.010 0.005 000 0.000 -0.005 • MC predicts 20 mm heave at cofferdam centreline • HS & HSsmall predict 11 mm & mm respectively HS HSsmall Predicted Wall Resultant Displacement MC Ux=6mm HS Ux=11mm HSsmall Ux=10mm Ux: wall horizontal displacement Predicted Stability of Wall S M f = FOS Sum-Msf FOS=2.8 2.5 MC Rotation mechanism with ith FOS 2.8 1.5 Sum-Msf = FOS FOS=2.8 2.5 HS 1.5 Sum-Msf = FOS FOS=2.8 2.5 HSsmall • “Phi-c' Phi c reduction reduction” for predicting FOS • FSP III sheetpile properties: EI=34440 kNm2/m; EA=3.92×106kN/m Mp=369 kNm/m; Np=3575 kN/m 1.5 36 Future We will look at some of these things in HK3 A A B C D D E F G G H Structural Elements Modelling of Strutted Excavations Spatial Dimensions : Idealization and Descretisation G Groundwater d t Mohr-Coulomb Model Hardening Soil Model (HK ) I ii lS Initial Stresses Safety Factor of Analysis PLAXIS HK1‐Exercise 1 PLAXIS HK1‐Exercise 1 ... model Introduction to PLAXIS 2D Introduction? ?to? ?PLAXIS? ?2D INPUT PLAXIS? ?HK 1? ?Introduction? ?to? ?PLAXIS? ?2D PLAXIS? ?HK 1? ?Introduction? ?to? ?PLAXIS? ?2D Project Properties PLAXIS? ?HK 1? ?Introduction? ?to? ?PLAXIS? ?2D. .. available from the menu Introduction to PLAXIS 2D Introduction? ?to? ?PLAXIS? ?2D CALCULATION PLAXIS? ?HK 1? ?Introduction? ?to? ?PLAXIS? ?2D Calculation Modes PLAXIS? ?HK 1? ?Introduction? ?to? ?PLAXIS? ?2D Plaxis Calculation... Q/A PLAXIS? ?HK 1 :? ?INTRODUCTION? ?TO? ?PLAXIS? ?2D PLAXIS? ?HK 1 :? ?INTRODUCTION? ?TO? ?PLAXIS? ?2D PLAXIS 2D :Introduction 2D I t d ti Hong Kong Lesson HK1-1 Contents Program: g Work-flow Plaxis 2D: Input Plaxis