Design Summary Report Ih 635 Managed Lanes Project Re-Evaluated Design Schematic

DRAFT DESIGN SUMMARY REPORT FOR THE IH 635 MANAGED LANES PROJECT RE-EVALUATED DESIGN SCHEMATIC PREPARED FOR: TEXAS DEPARTMENT OF TRANSPORTATION December 2006 This draft document is released on December 20, 2006 for information and reference purposes only under the authority of: Randall J. Poucket, P.E. #90495 George R. Teetes, P.E. #81151 Constance D. Bills, P.E. # 83877 Syed N. Aftab, P.E. #80137 Charles Edward Hood, P.E. #61366 Abenet Bekele, P.E. #86055 Michael J. Bauer, P.E. #94128 Robert K. Lindsey, P.E. #86979 Walter T. Ragsdale, P.E. #56735 It is not to be used for final design considerations. TABLE OF CONTENTS CHAPTER 1 - INTRODUCTION......................................................................1 1.1 Purpose ..........................................................................................................1 1.2 Project Description and Limits.........................................................................1 1.2.1 IH 635 West Section.............................................................................2 1.2.2 IH 635/IH 35E Interchange...................................................................2 1.2.3 IH 35E Section .....................................................................................3 1.3 Value Engineering (VE) Process.....................................................................4 1.4 Constraints and Criteria ..................................................................................5 1.5 Design Exceptions ..........................................................................................8 CHAPTER 2 - CIVIL DESIGN .........................................................................8 2.1 Roadway.........................................................................................................8 2.1.1 Geometric Design Criteria ....................................................................8 2.1.2 Roadway Geometric Design...............................................................11 2.2 Drainage.......................................................................................................16 2.2.1 Drainage Design Criteria ....................................................................16 2.2.2 Preliminary Drainage Design..............................................................20 2.3 Construction Schedule and Traffic Control....................................................21 2.3.1 Construction Sequencing, Phasing and Schedule ..............................21 2.3.2 Traffic Control.....................................................................................26 CHAPTER 3 - GEOTECHNICAL...................................................................28 3.1 Available Geotechnical Data .........................................................................28 3.2 Geologic Setting (IH 635 West Section)........................................................29 3.2.1 Overburden ........................................................................................29 3.2.2 Eagle Ford Shale................................................................................30 3.2.3 Austin Chalk.......................................................................................31 3.3 Geotechnical Considerations for the Re-Evaluated Design Schematic..........32 3.3.1 General ..............................................................................................32 CHAPTER 4 - STRUCTURAL DESIGN ........................................................34 4.1 Surface Structures – Bridges ........................................................................34 4.1.1 Structural Criteria ...............................................................................34 4.1.2 Structural Elements............................................................................34 4.2 U-Wall Structures..........................................................................................35 4.2.1 General ..............................................................................................35 4.2.2 Alignment and Profile Parameters ......................................................36 4.2.3 Dimensional Parameters ....................................................................36 4.2.4 Fire and Life Safety Considerations....................................................37 4.2.5 Structural System Determination and Description...............................37 4.2.6 Ancillary Facilities...............................................................................38 4.3 Cut-and-Cover Tunnel Structures .................................................................38 4.3.1 General ..............................................................................................38 4.3.2 Alignment and Profile Parameters ......................................................38 4.3.3 Dimensional Parameters ....................................................................39 4.3.4 Fire and Life Safety Considerations....................................................39 4.3.5 Loading Criteria:.................................................................................39 4.3.6 Structural System Determination and Description...............................40 4.3.7 Ancillary Facilities...............................................................................40 ii 4.4 Mined Tunnels ..............................................................................................41 4.4.1 General ..............................................................................................41 4.4.2 Tunnel Length and Portal Locations ...................................................41 4.4.3 Dimensional Parameters ....................................................................42 4.4.4 Tunnel Rock Properties for Design.....................................................42 4.4.5 Tunnel Excavation..............................................................................42 4.4.6 Ground Response to Excavation ........................................................42 4.4.7 Initial Ground Support ........................................................................43 4.4.8 Waterproofing for Mined Tunnels and Underground Structures..........43 4.4.9 Tunnel Final Lining.............................................................................44 4.4.10 Ancillary Facilities...............................................................................44 4.4.11 Fire and Life Safety Considerations....................................................44 4.5 Ancillary Facilities .........................................................................................44 4.5.1 General ..............................................................................................44 4.5.2 Emergency Exit Stairways..................................................................45 4.5.3 Utility Rooms......................................................................................45 4.5.4 Structures Combining Ventilation Shafts, Maintenance/Emergency Exits, and Utility Rooms......................................................................45 4.5.5 Cross Passageways...........................................................................46 4.5.6 Low-Point Pump Stations ...................................................................46 4.6 Tunnel Finishes ............................................................................................46 CHAPTER 5 - MECHANICAL, ELECTRICAL, AND POWER DESIGN........48 5.1 Tunnel Ventilation System Design ................................................................48 5.1.1 General Background Information........................................................48 5.1.2 Assumptions.......................................................................................49 5.1.3 Design Standards & Design Objectives ..............................................49 5.1.4 Other Design Considerations .............................................................49 5.1.5 Tunnel Ventilation System Modeling – General..................................50 5.1.6 Tunnel Ventilation Analysis During a Fire Emergency ........................52 5.1.7 Vehicular Emissions Under Non-emergency Conditions.....................52 5.1.8 Ambient Temperature within the Tunnel.............................................55 5.2 Fire Protection System Design......................................................................58 5.2.1 Fire Protection – General ...................................................................58 5.2.2 Assumptions.......................................................................................58 5.2.3 Tunnel and Depressed Managed Lanes Fire Protection Design Criteria ...........................................................................................................59 5.2.4 Fire Protection System Basic Configuration........................................59 5.3 Tunnel Drainage System Design...................................................................61 5.3.1 Tunnel Drainage – General ................................................................61 5.3.2 Drainage Design Criteria ....................................................................62 5.3.3 Preliminary Drainage Design..............................................................62 5.4 Depressed Managed Lane Lighting ..............................................................62 5.4.1 Partially Covered Depressed Managed Lanes Lighting Baseline Fixture Choice................................................................................................62

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