Search results with tag "Subgrade"
CONSTRUCTION AND ACCEPTANCE TESTING OF SUBGRADE …
www.virginiadot.orgUnderstand the compaction and testing requirements for various subgrade materials INTRODUCTION What is Subgrade? Subgrade is the top surface of an embankment or cut section that is shaped to conform to the typical section upon which the pavement structure and shoulders will be constructed.
California Bearing Ratio (CBR), Plate Load Test (PLT ...
article.sapub.orgFeb 01, 2012 · subgrade or subbase for highway and runway design and construction. Field plate load test is commonly used to pre-dict the deformations and failure characteristics of the soil/subgrade and modulus of subgrade reaction (k. s). Modulus of subgrade reaction (k. s) is used in foundation design, soil-structure interaction studies and design of
CHAPTER 3 CONSTRUCTION AND TESTING OF …
www.virginiadot.org2012 v1.0 3-1 CHAPTER 3 CONSTRUCTION AND TESTING OF SUBGRADE WHAT IS SUBGRADE? SUBGRADE EMBANKMENT FOUNDATION The top surface of an embankment or cut section,
EVALUATING WEAK SUBGRADE FOR PAVEMENT DESIGN …
yo-1.ct.ntust.edu.twRafiqul A. Tarefder, et al.: Evaluating Weak Subgrade for Pavement Design and Performance Prediction: A Case Study of US 550 15 5. EVALUATE US 550 SUBGRADE SOIL,
Basics of Concrete Pavement Thickness Design - PE Civil Exam
www.pecivilexam.comModulus of Subgrade Reaction, k Reaction Stacked Plates Hydraulic Jack Pressure Gauge Deflection Dial at 1/3 Points k (psi/in) = unit load on plate / plate deflection . Subgrade and Subbases Design • Subgrade strength is not a critical element in the thickness design.
Highway Engineering Field Formulas
www.wsdot.wa.govShld. to Subgrade Shld. and Slope Equivalents Equation: x B A = 100 A = Algebraic difference in % between shld. slope and subgrade slope B = Depth of surfacing at finished shoulder x = Distance from finished shld. to subgrade shld. Shoulder Slope Equivalent Rate of Grade Equivalent Vertical Angle 1:1.5 66.67% 33°41'24" 1:1.75 57.14% 29°44'42"
NRA ADDENDUM TO HD 25/94 PAVEMENT …
www.tiipublications.ieVolume 7 Section 2 Part 2 €ID 25/94 Chapter 2 - Subgrade Assessment 2. SUBGRADE ASSESSMENT 2.1 The subgrade is normally not strong enough to carry the construction traffic without distress,
AASHTO Pavement Thickness Design Guide
cecalc.comd. Composite modulus of subgrade reaction (kc) ‐ kc is the composite modulus of the subbase materials, which will take into account any base placed on top of the subgrade. If a base is used kc is input into the equation rather than k. Type of Soil Subgrade Strength
Specification 3.1 Subgrade Preparation
www.transportation.alberta.caSection 3 Specification 3.1 Subgrade Preparation 23 APR 2001 2 The finished subgrade surface shall be firm and uniform, true to grade and cross-section, and shall be
17-4.02(01) Subgrade-Treatment Types[Rev. Jan. 2011, Mar ...
www.in.gov17-4.02(01) Subgrade-Treatment Types[Rev. Jan. 2011, Mar. 2014] For each of the subgrade treatment types described below, the contractor is to choose from the
RELATIONSHIP BETWEEN THE SUBGRADE REACTION …
www.railway-research.orgChallenge E: Bringing the territories closer together at higher speeds RELATIONSHIP BETWEEN THE SUBGRADE REACTION MODULUS AND THE STRAIN MODULUS OBTAINED USING A PLATE LOADING TEST
Modulus of Subgrade reaction - Which one to use
www.ssiteam.comStructural Services, Inc. Page 1 of 11 Modulus of Subgrade Reaction - Which One Should be Used? By Wayne W. Walker, P.E. , F.ACI and …
CONSTRUCTION CROSS-SECTION DRAWINGS AND GUIDE ...
www.cambridgepavers.comfrom top of subgrade. drain to catch basins. 3. do not use drain holes to subgrade when water table is less than 2' (0.6 m) concrete beams at ends of pavement may …
Chapter 9 Embankments - Washington State Department of ...
www.wsdot.wa.govextending 100 feet beyond a structure’s end at subgrade elevation for the full embankment width, plus an access ramp on a 10H:1V slope from subgrade down to the original ground elevation. The bridge approach embankment also includes any embankment that replaces unsuitable foundation soil beneath the bridge approach embankment.
Modelling of Soil behaviour - IIT Kanpur
home.iitk.ac.inModulus of subgrade reaction or the coefficient of subgrade reaction k is the ratio between the pressure p at any given point of the surface of contact and the settlement y produced by the load at that point: 3/12/2014 13 Terzaghi (1955) introduced the Coefficient or …
Track Design Introduction - University of Kentucky
web.engr.uky.edustress, tie reaction, and allowable subgrade stress) – Talbot Equation h = (16.8p a /p c)4/5 where h = Support ballast depth p a = Stress at bottom of tie (top of ballast) p c = Allowable subgrade stress Note: Stress distribution independent of material – Japanese National Railways Equation p c = 50p a /(10+h1.25) – Boussinesq Equation p
Analyses of Lateral Loaded Piles with P-Y Curves ... - NCDOT
connect.ncdot.govVertical Modulus of Subgrade Reaction • Modulus of subgrade reaction (k) • Is it a soil property? NO • Footing, rafts, pavement design • Westergaard’s work in 1920’s • q = k D (used by structural engineers) –q = applied or contact pressure [F/L2] –D = settlement of footing under q [L] • k = q/D = slope (linear spring
MANUAL CHECKING OF STAADPRO INPUTS AND OUTPUT …
www.sefindia.orgIn order to account for the soil spring the modulus of subgrade reaction Ks has to be considered for the support condition. 5 MANUAL CHECK AGAINST STAAD RESULTS FOR SEISMIC FORCES ***** For the verification of the values generated by the STAADPRO program an example is ...
Transportation Criteria Manual SECTION 3 - …
www.roundrocktexas.gov3-2 SECTION 3 - PAVEMENT DESIGN 3.1.0 GENERAL The City has observed premature distress on many of the heavily traveled streets and on streets built on subgrade soils with high plasticity indices (P.I. >20).
18 Spec - Section 301 Base, Subbase, and Subgrade Aggregate
wisconsindot.govEffective with the December 2017 Letting 118 2018 Standard Specifications 301.2.4.3 Uses For Aggregate Classifications (1) The contractor may furnish the aggregate classifications, at the contractor's option, for the specified base types as allowed in table 301-1.
Lateral Load Capacity of Piles - Transportation Research Board
onlinepubs.trb.orgequals a constant and k = nhx; nh is the eoefficient of horizontal subgrade reaction (1)· The latter is a linearly increasing modulus w;i.th respect to depth as shown in Figure 4b. Solutions can readily be obtained for other desired variations of k by …
FIELD MOISTURE AND DENSITY TESTING WITH THE …
www.virginiadot.orgJun 22, 2015 · VTM‐1 and VTM 12, for proper testing instructions. Contact the Quarry or the District Materials Division for the specific gravity of the +4 material when encountered. Embankment/Subgrade Testing Procedures (Direct Transmission Method) 1) The test site must be properly selected and prepared.
User Guide to the Dynamic Cone Penetrometer
www.dot.state.mn.usconstruction operations are directly related to subgrade stability. Included in the guide are several examples of DCP applications, along with illustrative charts and diagrams. A DCP test worksheet is also included that may be copied for your convenience. Whether you conduct your own tests or are in partnership with others, the dynamic cone
TECH SPEC - Panablock
www.panablock.com3 traffic, subgrade soil strength, and pavement materials. The design engineer selects values representing attributes of these factors. The …
Evaluation of modulus of subgrade reaction (Ks) in …
www.geoplanning.itIAEG2006 Paper number 505 2 established. Valuable examples of this approach are the works by Burland and Burbridge (1984), Bustamante and Gianeselli (1982), Reese and Wright (1977), Reese and O’Neil (1987) and Jamiolkowski et al (1985).
STONE AGGREGATE DESCRIPTIONS
www.adamscounty.us• Too bulky to be used as a surfacing material but it is great for subgrade stabilization. • Used for construction entrances, road base and ditch lining.
Cement - PMGSY Home Page
www.pmgsy.nic.in5 Cement Stabilized Subgrade, Sub-base and Base Courses 1.0 Introduction Substantial length of the existing low volume rural roads in India is unpaved.
IS 9214 (1979): Method of determination of modulus of ...
law.resource.org0.2 The C modulus of subgrade reaction test', usually known as K-valur. test, is essenti111 y a plate bearing test. This test is used for the design of pavement structures and raft foundations. 0.3 Like all other soil strength tests, K-value test will not provide a representative measurement ofsuhgradc strength unless performed under
Subgrade Design and Construction
intrans.iastate.eduMar 06, 2020 · (CBR), modulus of subgrade reaction (k), and elastic (resilient) modulus. Although there are other factors involved when evaluating subgrade materials (such as swell in the case of certain clays), stiffness is the most common characterization and thus CBR, k-value, and resilient modulus are discussed here. 1.
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