Guideline for QCVN xxxx : 2013/BXD

Table of Contents

1.

Scope of application..................................................................................................

1

2.

Reference documents ...............................................................................................

1

3.

Nomenclatures and definitions.................................................................................

1

4.

Classification of works..............................................................................................

1

4.1

General stipulation .................................................................................................

1

4.2

Principles for the classification of hydropower works..............................................

2

5.

Guarantee of serving level of hydropower works....................................................

7

6.

Safety coefficient of hydropower civil works...........................................................

7

7.

Construction of hydropower civil works................................................................

26

7.1

General requirements ..........................................................................................

26

7.2

Reservoir .............................................................................................................

49

7.3

Dams ...................................................................................................................

53

7.4

Spillways..............................................................................................................

83

7.5

Waterway.............................................................................................................

90

7.6

Intakes .................................................................................................................

95

7.7

Settling basins......................................................................................................

98

7.8

Head tanks and surge tanks...............................................................................

101

7.9

Penstocks ..........................................................................................................

103

7.10

Tailraces ............................................................................................................

106

7.11

Outlets ...............................................................................................................

107

7.12

Hydropower plants (Powerhouse) ......................................................................

107

7.13

Daily storage reservoir .......................................................................................

110

7.14

Bottom discharge ...............................................................................................

110

7.15

Protective works of reservoirs, headwork area and downstream of headwork....

112

7.16

Observation device system of the work ..............................................................

112

8.

Hydromechanical equipments ..............................................................................

132

8.1

General requirements ........................................................................................

132

8.2

Valve gates ........................................................................................................

142

8.3

Trash rack..........................................................................................................

149

8.4

Steel penstock ...................................................................................................

150

9.

Stipulation of management ...................................................................................

154

10.

Organization for implementation..........................................................................

154

Appendix A......................................................................................................................

155

Appendix B......................................................................................................................

155

Appendix C......................................................................................................................

156

Appendix D......................................................................................................................

171

Guideline for QCVN xxxx : 2013/BXD

List of Tables

Table 4.2-1

Criteria for Project Ranking.............................................................................................

3

Table 4.2-2

Size Classification............................................................................................................

3

Table 4.2-3

Hazard Potential Classification........................................................................................

3

Table 4.2-4

Criteria for Hazardous Level ...........................................................................................

4

Table 6.1-1

Loads imposed on dam body ...........................................................................................

8

Table 6.1-2

Loads imposed on dam bodies.........................................................................................

8

Table 6.1-3

Basic definition of loads ..................................................................................................

9

Table 6.1-4

Design seismic coefficient .............................................................................................

10

Table 6.1-5

Uplift under various conditions .....................................................................................

10

Table 7.1-1

Criteria for Project Ranking...........................................................................................

33

Table 7.1-2

Criteria of Design and Check Flood (Return Period to be Applied)..............................

34

Table 7.1-3

Size Classification..........................................................................................................

34

Table 7.1-4

Hazard Potential Classification......................................................................................

34

Table 7.1-5

Recommended Safety Standards ...................................................................................

34

Table 7.1-6

Criteria for Hazardous Level .........................................................................................

35

Table 7.1-7

Tanaka’s rock classification method used for dam foundation ......................................

40

Table 7.3-1

Crest elevation of non-overflow section of dam............................................................

55

Table 7.3-2

Wave heights by fetch and wind velocity ......................................................................

57

Table 7.3-3

Normal freeboard and minimum freeboard ...................................................................

57

Table 7.3-4

Crest elevation of non-overflow section of dam............................................................

73

Table 7.3-5

Wave heights by fetch and wind velocit ........................................................................

76

Table 7.3-6

Normal freeboard and minimum freeboard ...................................................................

76

Table 7.3-7

Lugeon values and infiltration factors according to dam height....................................

82

Table 7.4-1

Criteria for Project Ranking...........................................................................................

85

Table 7.4-2

Criteria of Design and Check Flood (Return Period to be Applied)..............................

85

Table 7.4-3

Size Classification..........................................................................................................

85

Table 7.4-4

Hazard Potential Classification......................................................................................

86

Table 7.4-5

Recommended Safety Standards ...................................................................................

86

Table 7.4-6

Criteria for Hazardous Level .........................................................................................

86

Table 8.1

Classification of forces on gates ..................................................................................

140

Table 8.2

Classification of forces on penstocks...........................................................................

141

Guideline for QCVN xxxx : 2013/BXD

List of Figures

Fig.6.1-1

Typical loads acting on dam body ...................................................................................

9

Fig.6.1-2

Expected function of drains ...........................................................................................

10

Fig.7.1-1

Process for decision of environmental flow rate............................................................

28

Fig 7.1-2

Hydraulic analyses of discharge facilities......................................................................

31

Fig 7.1-3

Area of grouting.............................................................................................................

43

Fig.7.1-4

Estimation of Lugeon value...........................................................................................

44

Fig.7.3-1

Normal and minimum freeboard....................................................................................

55

Fig.7.3-2

Height of wave above reservoir water surface...............................................................

56

Fig.7.3-3

Run-up wave height (inclusive of wave height) obtained by combined use of

S.M.B. Method and Saville's Method............................................................................

56

Fig.7.3-4

Crest of fill type dam .....................................................................................................

57

Fig.7.3-5

Prohibited Case..............................................................................................................

58

Fig.7.3-6

Acceptable Case.............................................................................................................

58

Fig.7.3-7

Seepage Flow in Zoned Type Fill Dams........................................................................

59

Fig.7.3-8

Grain-size Range of the Borrow Material......................................................................

60

Fig.7.3-9

Settlement of dam crest after completion ......................................................................

60

Fig.7.3-10

Detail of perimeter joint.................................................................................................

65

Fig.7.3-11

Relation between water content and properties .............................................................

66

Fig.7.3-12

Normal and minimum freeboard....................................................................................

74

Fig.7.3-13

Height of wave above reservoir water surface...............................................................

74

Fig.7.3-14

Run-up wave height (inclusive of wave height) obtained by combined use of

S.M.B. Method and Saville's Method............................................................................

75

Fig 7.3-15

Drain hole in gallery ......................................................................................................

82

Fig 7.3-16

Installation of waterstop, joint drain, and crack initiator ...............................................

83

Fig.7.4-1

Classification of reservoir sediment management .........................................................

88

Fig.7.5-1

Hydraulics of pipe flow .................................................................................................

91

Fig.7.6-1

Representative type of pressure type intake...................................................................

96

Fig.7.6-2

Submerge depth of pressure type intake ........................................................................

98

Fig.7.7-1

Settling of soil or sand particle ......................................................................................

99

Fig.7.7-2

Relationship between settling velocity and particle size ...............................................

99

Fig.7.7-3

Cleaning of settling basin ............................................................................................

100

Fig.7.8-1

Hydraulic conditions of surge tank..............................................................................

102

Fig.7.8-2

Visual description of symbols in equation for restricted orifice type surge tank.........

102

Fig.7.9-1

Cross Section Image of Penstock and its Internal Water Pressure...............................

104

Fig.7.9-2

Relationship of h and h0...............................................................................................

106

Fig.7.12-1

Development process of underground cavern..............................................................

109

Fig.7.12-2

Construction of underground cavern ............................................................................

110

Guideline for QCVN xxxx : 2013/BXD

Fig.8.1

Hydrostatic pressure ....................................................................................................

132

Fig.8.2

Friction force................................................................................................................

133

Fig.8.3

Operating force ............................................................................................................

134

Fig.8.4

Air vacuum force in case of closing gate.....................................................................

135

Fig.8.5

Forces at lifting gear in case of stuck gate...................................................................

135

Fig.8.6

Earthquake force..........................................................................................................

136

Fig.8.7

Longitudinal force causing by changes of pipeline diameters.....................................

136

Fig.8.8

Longitudinal force causing by changes of pipeline direction at bend section .............

137

Fig.8.9

Water pressure acting on pipe shell .............................................................................

137

Fig.8.10

Own weight of pipe shell and water ............................................................................

138

Fig.8.11

Rock pressure on intermediate abutments ...................................................................

139

Fig.8.12

Forces causing by uneven settlement of intermediate abutments ................................

139