Page 19 - Building Regulation and Design Guidelines - Structural (Grey Code)
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SECTION: 1  GEOTECHNICAL GUIDELINES & REGULATIONS                                     SECTION: 1  GEOTECHNICAL GUIDELINES & REGULATIONS




                          -   Surface manifestation.
                          -   Lateral spreading or land sliding.
                          -   Loss of bearing capacity for shallow foundation.
                          -   Loss of lateral soil stiffness


               1.4   SOIL IMPROVEMENT GUIDELINES
                     1.4.1   Soil  liquefaction  improvement  techniques  may  be  characterized  as                                POUNDER
                          densification, drainage, reinforcement, mixing, replacement, Vibro
                          Compaction, Vibro replacement (Vibro Stone Columns), deep dynamic                       PATH #  2  1   2   1   2   1
                          compaction and compaction jet grouting.
                                                                                                                                                   WORK PLATFORM
                          •   Wick drains, Fig. (1.16), are also an accepted technique whenever
                              a permanent dewatering is provided. However, the use of this                                     COMPACTED SOIL       LOOSE SOIL
                              technique should be evaluated with extreme caution.
                          •   Fig. (1.17) Shows the method statement of the dynamic compaction                                                      FIRM BASE
                              and in Fig. (1.18) Comparison between dynamic and vibro
                              compaction is presented with respect to tip resistance along depth.
                                                                                                                    Fig. (1.17): Method Statement of Dynamic Compaction







                                                                                                                        DYNAMIC COMPACTION          VIBRO COMPACTION





                               HYWARD
                               BAKER

                                                                                                                           0  5  10 15 20  25 30   0  0  5  10 15 20 25 30
                                                                                                                          0                        2
                                                                                                                          2                        4
                                                                                                                          4                        6
                                                                                                                          6                        8
                                                                                                                          8
                                                                                                                         10                       10 12
                                                                                                                         12                       14
                                                                                                                         14                       16
                                                                                                                         16                       18
                                                                                                                         18                       20
                                                                                                                         20
                                                                                                                 Fig. (1.18): Comparison between Dynamic & Vibro Compaction
                                 Fig. (1.16): Wick Drains Technique
          36                                                                                                                                                     37
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