HomeMy WebLinkAboutSUB201500069 Study Road Plan and Comps. 2015-07-24 c'''''''' PROJECT MANAGEMENTT
S
CIVIL ENGINEERING
LAND PLANNING
ENGINEERINGa
July 24, 2015
Mr. Justin Deel
Regarding: SUB 2015-00069-Hillbrook
Road Plans
Dear Mr. Deel,
Please find attached four copies-two for your own review and two for VDOT's-of the computations and exhibits
relating to the Road Plans for Hillbrook, as listed below:
• Pavement Design Worksheets
• Fire Flow Computation
• Storm Structure Drainage Map
• LD-204
• LD-229
• LD-268
• LD-347
If you have any questions please do not hesitate to contact me at your earliest opportunity at lauren@shimp-
engineering.com or Justin Shimp, P.E. may be reached at:justin@shimp-engineering.com or by phone at 434-953-
6116.
Best Regards, l
V0/1/7 (
L ren Gilroy
Shimp Engineering, P.C.
stid
Appendix II
Nomograph for Determining Required Pavement Thickness Index
(Note:An enlarged vasion of this nomograph isprovided on the last page of this reference.)
Final pavement design must be based on the results of appropriate soil tests.
Preliminary designs may be based on values established in Appendix I.
(Nomograph omitted to save space.)
To determine DR, project a line from the value for SSV through the value for the Design AADT.
The nomograph depicted correlates the soil support value of the subgrade (SSV=Design CBR x RF), the
traffic volume (Design AADT), and the minimum required pavement design thickness index (DR) for
subdivision streets and secondary road pavement, based on AASHO design equations. The equation on
which the nomograph is based is: DR = 3.48Ln (AADT) -1.48Ln (SSV) -7.23, where Ln is the natural
logarithm. This nomograph assumes the following:
1. Use of Design AADT for two way traffic, equally distributed, thereby deriving the
thickness index (DR)required for any portion of the pavement to support one-half of the
design AADT.
2. For DR greater than 20, staged consttuction providing an initial stage DR value of 20 may
be permitted or the road can be designed using primary pavement methodology.
3. The District Materials Engineer may consider reducing the minimnm DR value of 6.4 for
secondary system facilities having a Design AADT<50.
Computation from equation
Hillbrook
AADT 60
CBR 6
RF 1
SSV 6
DR 4.4
HCV 3%
sloe
Appendix IV
Flexible Pavement Design Worksheet for New Subdivision Streets
This sheet is intended for use and submission in conjunction with VDOT's Secondary Street Acceptance Requirements
County Albemarle Date: 7/24/2015
Subdivision 3
Street Name Hillbrook Court
Design Engineer Justin Shimp Phone: 434.227.5140
AADT Projected traffic for the street segment considered,as defined in the Subdivision Street Requirements.
CBRD Design CBR=Average of CBRT x 2/3 and modified only as discussed in the Pavement Design Guide.
CBRT CBR value of the subgrade sample,taken and tested as specified in the Pavement Design Guide
DME VDOT District Materials Engineer
EPT Equivalent projected traffic
HCV Number of Heavy Commercial Vehicles(e.g.trucks,buses,etc.,with 2 or more axles and 6 or more tires).
%HCV Percentage of the total traffic volume composed of Heavy Commercial Vehicles.
RF Resiliency Factor=Relative value of the subgrade soil's ability to withstand repeated loading.
SSV Soil support value of subgrade(SSV=CBRD x RF)
Dp Thickness index of proposed pavement design computed by the Conventional Pavement Design Method
DR Thickness index required,based on Design AADT and SSV,determined by Appendix II.
Step 1• Determine Design AADT Step 2: Determine Design Values
• CBR, RF, and SSV
AADT 60 Sample No. CBRT Resiliency Factor (RF)
%HCV= 100(HCV/ AADT) 1 6 Source Value
or 3.0% 2 6 Table 1 1.5
EPT=20 x HCV Note:For 3 6 Appendix I 1.0
Note:For%HCV<5%,use AADT %HCV>5%. DME approved RF
EPT>AADT For preliminary designs,use the
lowest RF value in the equation
Design AADT
Use greater of AADT or EPT 60 CBRD x RF = SSV
(6.0) x ( 1.0) = 6.0
Step 3: Pavement Design (Check appropriate box and show proposed pavement design below.)
❑ (A) Limited to Design AADT<400-Show pavement material notations and thickness from Appendix IV Tables A and B. 1
2 (B)Show pavement section as developed inthe Pavement Design Guide. DR= 4.4
(See Appendix III for material notations and thickness equivalency values(a)). from Appendix II
Description of Proposed Pavement Section
Material Notation Thickness,h a (a x h)
Surface SM-9.5A 1.5 1.67 2.505
Intermediate BM-25.0 2.5 1.67 4.175
Base VDOT#21A 4 0.6 2.4
Dp must equal or exceed the value of DR. Dp=E(a x h)= 9.1
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