Design 58.4 Unsafe.pdf

Flexible Pavement Design - Base Data Name of work

Junction improvements at Km 58/4 of Thanjavur Mannargudi - Muthupet Road junction with Nagore Nagapattinam - Tuticorin - Ramanathapuram road

Carriageway width

Two lane

Classification of road

SH

Design life

15

Initial traffic (A) (in both direction) (CVD)

2328

Traffic growth rate

5

Year of traffic census

2014

Terrain

Plain

Current year

2016

Construction period

1

CBR Values of subgrade used for calculcation of 90th Percentile CBR Calcuation

Yes 5,5,5,4,5,5

90th Percentile CBR of sub grade Whether subgrade to be replace with borrow material

4.6 No

CBR of select sub grade (borrow material) Whether stage construction involved

Yes

If yes, life of bituminous layers

5 Years

Grade of Bitumen for wearing course and binder course

VG30

TNHD_Pave_V 3.1

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Released in - Jul.2015

Flexible Pavement Design - Base Data Initial Traffic after completion of construction

=2328x(1+5%)^(2016-2014+1)x1 2695 CVD

Whether Axle Load Survey conducted?

No

If yes, VDF value from Axle Load Survey

0

Vehicle Damage Factor used for design traffic

4.5

Lane Distribution Factor

0.5

Design Traffic For 15 Years

=365 * ( (1+r)^n - 1) * A * D * F )/ r =365x2695x((1+0.05)^15-1)x0.5x4.5/0.05/1000000 47.76 MSa

For 5 Years

=365x2695x((1+0.05)^5-1)x0.5x4.5/0.05/1000000 12.23 MSa

% volume of air voids (Va) to be adopted in DBM

4.5

% volume of bitumen (Vb) to be adopted in DBM

11.5

Type of Binder Course Adopted

DBM

Stage construction can be adopted

Rs. 5379.70

Rate of DBM used for cost analysis

Rs. 6545.02

Note: On the basis of economic analysis BM can be adopted upto 60 mm Stage construction can be adopted

TNHD_Pave_V 3.1

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Released in - Jul.2015

80th and 90th percentile CBR values Entered CBR Values

Percentile ---->

5,5,5,4,5,5

90 90 80 80

4.597839136 4.597839136 5.198079232 5.198079232

4.597839136 5.198079232

90 80

120 100 y = -16.66x + 166.6

80 60 40

Equation of the CBR graph is

CBR ---->

20 y = -16.66x + 166.6

a -16.66

0 0

CBR values for

TNHD_Pave_V 3.1

1

90 4.60

2

90 80

b 0

3

c 0

4

d + 166.6 5

6

80 5.00

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Released in - Jul.2015

Design of flexible pavement - strain check Junction improvements at Km 58/4 of Thanjavur - Mannargudi - Muthupet Road junction with Nagore Nagapattinam - Tuticorin - Ramanathapuram road CBR

=

4.6

Poisons ratio for cemented layers

0.25

Poisons ratio for all the other layers

0.35

Assumed Layer thickness for

1.Granular Base and Granular Subbase

BC

=

40

DBM

=

75

WMM

=

250

GSB

=

380

115

Thickness of BC & DBM

630

Thickness of GSB + WMM

745 MSA

12.23 Bitumen layer

5 Yrs

=

47.76 Granular layer 12.23

10 Yrs

=

27.84

15yrs

=

47.76

IITPAVE to be run for 3 layer analysis

Resilient modulus (M) M Subgrade

= = M Subgrade =

10*CBR

M Granular

0.2 x E subgrade x h^0.45 167.298125 167

M Granular

= = =

0.64

17.6*(CBR) 46.00

For CBR <= 5 For CBR > 5

MR of Bituminous layers Table 7.1 of IRC 37-2012 (For DBM) 2300 VG10 Temp 20oC o 2000 VG10 Temp 25 C 1700 VG30 Temp 35oC 3000 VG40 Temp 35oC

DBM For BM

M Bitumen

=

TNHD_Pave_V 3.1

1700

500 700

46

Released in - Jul. 2015

Allowable Strain Calculation Horizontal Tensile Strain at the bottom of the bituminous layers Calculation of Tensile strain Nf = 2.21 x 10^ - 4 x {1/εt}^3.89 x [1/MR]^0.854 Nf = 0.5161 x C x 10^ - 4 x {1/εt}^3.89 x [1/MR]^0.854 Where C =

for 80 % reliability for 90 % reliability

M=(4.84x (Vb /(Va+Vb)-0.69)) Va = Vb = 4.5 11.5 2957.39544 #VALUE! 338.14E-06 Allowable Tensile strain

10^M,

1/εt = εt = εt Horizontal Tensile Strain at the bottom of the cemented base Not Applicable N= N= 1/εt = εt = εt =

RF x [ (113000/E0.804+191) / εt ]12 N/A N/A

RF = 1 if >1500 CVD and 2 if <1500 CVD

N/A in microstrain 000.00E+00 Allowable Tensile strain

Vertical Compresive Strain at the bottom of the Granular sub base Calculation of Vertical strain N = 4.1656*10^-8*(1/εv)^4.5337 N = 1.41*10^-8*(1/εv)^4.5337 1/εv = 1/εv = εv =

for 80 % reliability for 90 % reliability

(47760000/(1.41*10^-8))^(1/4.5337) 2663.32455 375.47E-06 Allowable Vertical strain Comparison of allowable strain with actual strain(from IITPAVE) Values given below are micro strain Allowable Actual 338 micro Strain 339 micro Strain 0 micro Strain 0 micro Strain 375 micro Strain 350 micro Strain

Tensile strain at the bottom of bituminous layers Vertical compressive strain at the top of Sub grade

The section is unsafe in tension at bottom of bituminous layer The section is safe under compressive strain check

TNHD_Pave_V 3.1

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Released in - Jul. 2015

IITPAVE Result

No. of layers 3 E values (MPa) 1700.00 167.00 46.00 Mu values 0.350.350.35 thicknesses (mm) 115.00 630.00 single wheel load (N) 20500.00 tyre pressure (MPa) 0.56 Dual Wheel Z R SigmaZ SigmaT SigmaR TaoRZ DispZ epZ epT epR 115.00 0.00-0.1729E 0.7133E 0.5634E0.1780E-01 0.5864E0.3646E-03 0.3392E-03 0.2202E-03 115.00L 0.00-0.1729E0.1389E-01-0.2861E-01-0.1780E-01 0.5864E0.9463E-03 0.3392E-03 0.2202E-03 115.00 155.00-0.1384E 0.5451E 0.1061E0.7751E-01 0.5966E0.2155E-03 0.3273E-03-0.2133E-04 115.00L 155.00-0.1384E0.1367E-01-0.5679E-01-0.7751E-01 0.5966E0.6812E-03 0.3273E-03-0.2133E-04 745.00 0.00-0.1433E-01 0.2603E-01 0.2319E-01-0.2123E-02 0.3580E0.1890E-03 0.1373E-03 0.1143E-03 745.00L 0.00-0.1433E-01 0.1472E-02 0.9012E-03-0.2124E-02 0.3580E0.3296E-03 0.1342E-03 0.1174E-03 745.00 155.00-0.1513E-01 0.2723E-01 0.2575E-01-0.2609E-02 0.3649E0.2017E-03 0.1408E-03 0.1288E-03 745.00L 155.00-0.1514E-01 0.1598E-02 0.1192E-02-0.2599E-02 0.3649E0.3503E-03 0.1409E-03 0.1289E-03

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output from iitpave