Volume 6 – Geotechnical Manual, Site Investigation and Engineering ...

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Chapter 8 GROUND IMPROVEMENT Figure 8.13 Relationship of F(n) and D/dw Figure 8.13 shows the relationship of F(n) to D/d w for the ideal case. Within a typical range of D/d w , F(n) ranges from approximately 2 to 3. The theory of consolidation with radial drainage assumes that the soil is drained by a vertical drain with circular section. The radial consolidation equations include the drain diameter, d. A band shape PVD drain must therefore be assigned as “equivalent diameter”, d w. For design purposes, it is reasonable to calculate the equivalent diameter as:- where, d w = (2(a+b)/π) (8.5) a b = width of the band – shaped drain cross section = thickness of a band-shaped drain cross section Equation A8.5 can be further simplified to d w = (a + b) /2 (8.6) 8A-4 March 2009
Chapter 8 GROUND IMPROVEMENT % of Consolidation Consolidationn period (month) Spacing (m) C h m 2 /year Figure 8.14 Design Chart for Horizontal Consolidation The Design Chart shown in Figure 8.14 can be used as a preliminary guide for PVD design. Simple input parameter such as drain spacing, degree of consolidation, required consolidation duration and coefficient of horizontal consolidation are used for PVD design. In context of local Malaysian soft soil, the typical spacing of PVD ranges from 1.0 to 1.5m c/c. In some construction, to further reduce the consolidation period, additional surcharge load is used. Some of the typical properties specified for Prefabricated Vertical Drain (PVD) are as shown in Table 8.1 below. The actual limiting values of the properties can be obtained from the various suppliers or manufacturers: March 2009 8A-5
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GOVERNMENT OF MALAYSIA DEPARTMENT O
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DID MANUAL Volume 6 Foreword The fi
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DID MANUAL Volume 6 List of Volumes
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DID MANUAL Volume 6 Registration of
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DID MANUAL Volume 6 List of Symbols
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CHAPTER 1 GENERAL
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Chapter 1 GENERAL (This page is int
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Chapter 2 GEOTECHNICAL DESIGN PROCE
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CHAPTER 5 BEARING CAPACITY THEORY
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CHAPTER 7 RETAINING WALL
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PART 2: SOIL INVESTIGATION
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Chapter 1 PLANNING AND SCOPE Table
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PART 3: ENGINEERING SURVEY
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Chapter 1 GEOMATICS AND LAND SURVEY
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CHAPTER 6 CHECKLIST FOR TERRAIN FEA
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