XSTABL Reference Manual

1 XSTABL . An Integrated Slope Stability Analysis Program for Personal Computers Reference Manual Version 5. Interactive Software Designs, Inc Moscow, ID 83843, . XSTABL . An Integrated Slope Stability Analysis Program for Personal Computers Reference Manual Version 5. prepared by Sunil Sharma for Interactive Software Designs, Inc 953 N. Cleveland Street Moscow, ID 83843, XSTABL . VERSION Copyright 1990 - 2008, All rights reserved. INTERACTIVE SOFTWARE DESIGNS, Inc. NOTICE. The XSTABL documentation and software are copyrighted with all rights reserved. Under copyright laws, no part of the XSTABL documentation or software may be copied, reproduced, transmitted, or translated into any language, natural or computer, in any form or by any means, without the prior written consent of Interactive Software Designs, Inc.

2 Although the software has been tested and the documentation reviewed, the programs are provided "as is", that is, without any warranty, express or implied. The user assumes the entire risk as to the quality of the results and operation of the programs. Interactive Software Designs, Inc., reserves the right to make changes to the XSTABL software and information contained in this document without obligation to report such changes to any person of such modifications. The user is also specifically advised, and cautioned, to exercise careful engineering judgement in the correct interpretation of the final results. License No. XSTABL . License Agreement Copyright , 1990 - 2006. INTERACTIVE SOFTWARE DESIGNS, Inc. All Rights Reserved READ BEFORE USING. WARNING: Carefully read this license agreement before using the XSTABL program.

3 Use of the program indicates your acceptance of the terms of this license. The licensed software is provided for your personal business, professional and educational use and may be installed on more than one computer or a single network. However, XSTABL may NOT be operated on more than one personal computer at the same time. Without the written consent of INTERACTIVE SOFTWARE DESIGNS, Inc., YOU. MAY NOT : 1. Make copies of XSTABL with the intent to supply other users, 2. Transmit XSTABL via any electronic media, 3. Duplicate the XSTABL Reference Manual , 4. Attempt to disassemble the XSTABL machine-code for any purpose whatsoever. TABLE OF CONTENTS. INTRODUCTION .. 1. Summary of Interactive Features of XSTABL .. 2. General Information .. 3. Hardware Requirements .. 4. Connecting HP Plotters.

4 5. XSTABL Installation .. 6. XSTABL Components .. 6. Files for using XSTABL .. 7. Supporting XSTABL files .. 8. Other Files: .. 9. Starting XSTABL .. 9. Alternative SI Units .. 9. The Alternative Parallel Port LPT2 .. 9. The Alternative Serial Port COM2 .. 9. Example Input and Output Files .. 10. XSTABL Tutorial .. 10. Device Driver .. 11. Loading and Execution Errors .. 11. MENU STRUCTURE OF XSTABL .. 13. Main Menu .. 15. Special Commands .. 16. XSTABL Filename Convention .. 17. Other Filename Format .. 19. Prepare Slope Data Menu .. 20. Exit from Prepare Slope Data Menu .. 21. Load Data from Disk .. 22. Clear Existing Data .. 23. DOS File Operations .. 23. Format of Input Data Files .. 26. Slope Analysis Menu .. 27. Help Screens (F1) .. 28. Maximum Limits imposed by XSTABL .

5 30. Preview of Slope Profile (F2) .. 31. Note on Plot Scale .. 33. XSTABL Reference Manual i DESCRIPTION OF TABLES .. 35. Append Mode .. 36. Editing Mode .. 36. Editing Features .. 37. Problem Geometry .. 38. Slope Profile .. 38. Surface Boundary .. 40. Inserting/deleting Segments .. 41. Subsurface Boundaries .. 42. First Subsurface Boundary .. 42. Subsequent Subsurface Boundaries .. 43. Completion of Subsurface Data .. 43. Inserting/deleting Segments .. 43. Inserting "New" Subsurface Boundaries .. 43. Example Profile .. 45. Surface Boundary .. 46. Subsurface Boundary .. 48. Addition of New Segments .. 49. Cracked Section .. 51. Soil Parameters .. 53. Reinforced Slope .. 56. Reinforcement Example .. 57. Strength Type .. 61. Nonlinear Mohr-Coulomb Strength .. 62. Anisotropic.

6 63. Pore Water Pressures .. 65. Water Surfaces .. 66. Phreatic Surfaces .. 68. Piezometric Surface .. 68. Pore Pressure Parameters .. 69. Pore Pressure Grid .. 70. Pore Water Pressure Grid - Example .. 71. Earthquake Loads .. 72. Surcharge Loads .. 73. Limiting Boundaries .. 75. Lower Limiting Boundary .. 75. Upper Limiting Boundary .. 75. ii Copyright 2008, Designs, Inc. METHODS OF ANALYSIS .. 77. Analysis of Right Facing Slopes .. 78. UPPER/LOWER ANGULAR LIMITS .. 78. SEARCH-BOXES .. 78. SPECIFIC, SINGLE SURFACES .. 78. Search for Critical Surface .. 79. REMARK ABOUT RANDOM NUMBER SEQUENCE .. 79. Circular Surfaces .. 80. Noncircular Surfaces .. 83. REMARK ON SEGMENT LENGTHS .. 83. Block Surfaces .. 84. Analysis of Single Failure Surfaces .. 88. Circular Surfaces .. 90. Calculation of Circle Center.

7 91. Noncircular Surfaces .. 92. STABILITY ANALYSIS .. 93. Filenames .. 93. Plot of Slope Profile .. 95. Plot of Generated Surfaces .. 98. View screen plot only .. 100. View and save the plot .. 100. Bypass this option .. 101. Negative Effective Stresses .. 102. Plot of the Most Critical Surfaces .. 104. Review of *.OPT Output File .. 105. Review of Hardcopy Plots .. 107. Analysis of a Single Surface .. 111. Spencer's Method .. 111. General Limit Equilibrium Methods .. 111. Janbu's GPS Method .. 115. Force Equilibrium Methods .. 116. Simplified Bishop Method .. 118. Output from the Analysis of a Single Surface .. 119. XSTABL Reference Manual iii HARDCOPY PLOTS USING XPLOT .. 127. ACKNOWLEDGEMENTS .. 131. APPENDIX A. EXAMPLE PROBLEM .. 133. ANALYSIS .. 136. Circular Surfaces.

8 137. Block Shaped Surfaces .. 138. Noncircular Surfaces .. 140. Cracked Section Analysis .. 141. APPENDIX B. FORMAT OF INPUT DATA FILE .. 143. Slope Geometry .. 143. Cracked Section .. 144. SOIL PROPERTIES. Soil Property Data (isotropic) .. 144. Reinforced Slope .. 144. Nonlinear Mohr-Coulomb Strength Envelope .. 145. Undrained Soil Strength .. 145. Anisotropic Strength .. 145. Phreatic and Piezometric Surfaces .. 146. Pore Pressure Grid .. 146. SLOPE ANALYSIS. Circular Surface Search .. 147. Irregular Surface Search .. 147. Block Surface Search .. 148. Specific Circular Failure Surface .. 148. Specific Noncircular Failure Surface .. 148. Earthquake Loads .. 149. Boundary Loads .. 149. Limiting Boundaries .. 149. iv Copyright 2008, Designs, Inc. APPENDIX C. LIST OF INPUT DATA ERRORS.

9 151. Soil Properties .. 151. Nonlinear Mohr-Coulomb .. 152. Slope Geometry .. 152. Water Surfaces .. 153. Boundary Surcharge Loads .. 154. SURFACE SEARCH - Circular / irregular .. 154. Block Surfaces - Search .. 156. Specific Surface .. 157. General Errors - all surfaces .. 158. APPENDIX D. METHODS OF ANALYSIS .. 161. The Generalized Limit Equilibrium (GLE) Method .. 164. Janbu's Generalized Procedure of Slices (GPS) .. 169. Simplified Janbu Method .. 173. Simplified Bishop Method .. 176. Reinforced Slope Analysis .. 178. Nonlinear Mohr-Coulomb Analysis .. 181. Control of Negative Effective Stresses .. 181. APPENDIX E. SEARCHING TECHNIQUES .. 185. Random Numbers .. 185. Circular Surface Generation .. 186. Adjustment of .. 189. Irregular Surface Generation .. 193. Block Surface Generation.

10 196. Rankine Wedges .. 197. Block Wedges .. 198. Search Boxes .. 199. XSTABL Reference Manual v APPENDIX F. DETERMINATION OF SLICE DATA .. 101. Determination of Slice Widths .. 201. Calculation of Slice Weight .. 202. Pore Pressure Calculations .. 202. Phreatic Surface .. 204. Piezometric .. 205. Pore Pressure Grid .. 206. Submerged Slopes .. 207. Earthquake Loads .. 208. Boundary Surcharge Loads .. 208. REFERENCES .. 209. INDEX .. 211. vi Copyright 2008, Designs, Inc. CHAPTER 1. INTRODUCTION. XSTABL is a fully integrated slope stability analysis program designed to operate on an IBM. personal computer, or close compatible. It permits the engineer to develop the slope geometry interactively and perform the slope analysis from within a single program. The slope analysis portion of XSTABL uses a modified version of the popular STABL program, originally developed at Purdue University.