Guide to Passing the Civil PE Exam Geotechnical AM Edition 1. Michael Frolov, P.E. Mark F. DeSantis, P.E., PMP
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1 Guide to Passing the Civil PE Exam Geotechnical AM Edition 1 Michael Frolov, P.E. Mark F. DeSantis, P.E., PMP ii
2 TOPICS Topic Page TOPIC III: Soil Mechanics TOPIC IV: Structural Mechanics TOPIC VII: Materials iii
3 TABLE OF CONTENTS How to Use This Guidebook... v Geotechnical Cheat sheet... vi-vii References... viii TOPIC III: Soil Mechanics 1. Lateral Earth Pressure Soil Consolidation Effective and Total Stresses Bearing Capacity Foundation Settlement Slope Stability TOPIC VII: Structural Mechanics 7. Retaining Walls TOPIC VII: Materials 8. Soil Classification and boring log interpretation Soil Properties Material test methods and spec conformance Compaction iv
4 READ FIRST: How to Use This Guidebook This guide for the Geotechnical AM Module and is intended to help walk you through studying for the Civil PE exam. You will find all of the study material needed for the AM geotechnical portion of the exam. We have spent countless hours reviewing material from the Civil Engineering Reference Manual (CERM), reference manuals below, study guides, the internet, and other engineering textbooks to ensure that we have provided you with the most up-to-date and accurate resource available. When you begin studying from this book use the following approach: 1. Print out e-book and place in 3 binder. Label the Binder Geotechnical Engineering and tab each chapter. 2. Make sure the geotechnical engineering cheat sheet is in the front of the binder. Add to it as needed. 3. Once you complete each chapter, solve as many problems as you can that relate to the chapter you just covered. Do at least three problems from other sources. If you have any questions on a technique or a concept, ask the question at 4. Place those problems inside the geotechnical binder behind the chapter and make a tab labeled Problems. If you use another reference manual when solving problems, make sure to tab them as well. Write all the references you used and problems you solved in the space provided at the end of each section. If you follow this approach, you will have solved multiple problems for every section and you will have all your references, notes pages, and problems fully tabbed for the geotechnical portion so that you can easily reference them during the actual exam. To report errors in this text, write to learncivilengineering2012@gmail.com v
5 Geotechnical Cheat Sheet Lateral Earth Pressure σ h ' = K o σ v ' K o(nc) = 1 - sinϕ' K p = 1 / K a (Rankine) K a = tan 2 (45 - ϕ/2) = [1 - sin(ϕ)] / [1 + sin(ϕ)] (Rankine) K p = tan 2 (45 + ϕ/2) = [1 + sin(ϕ)] / [1 - sin(ϕ)] P a = ½K a γ t H 2 P p = ½K p γ t H 2 P Q = K a QH P w = ½γ w (H-d) 2 Soil Consolidation C c = 0.009(LL 10) c v = k(1+e) / (a v γ w ) T = (c v t)/h dr 2 OCR = σ' p /σ' v OCR > 1 (when σ' p > σ v + Δσ) s c = [(C r H o ) / (1 + e o )] log 10 [(σ v + Δσ) / σ v ] OCR > 1 ( when σ' p < σ v + Δσ) s c = [(C r H o ) / (1 + e o )] log 10 [(σ' p ) / σ v ] + [(C c H o ) / (1 + e o )] log 10 [(σ v + Δσ) / σ' p ] OCR = 1 s c = [(C c H o ) / (1 + e o )] log 10 [(σ v + Δσ) / σ v ] OCR < 1 s c = [(C c H o ) / (1 + e o )] log 10 [(σ v + Δσ + Δσ v ) / σ v ] Effective and Total Stresses σ v = γ t z γ tot = γ dry (1 + w.c.) σ' v = σ u u = γ w z w σ z = Δσ v = 3Qz 3 / 2π(r 2 + z 2 ) 5/2 (point load) σ z = P / (B + z) (strip footings) σ z = 2Qz 3 / π(r 2 + z 2 ) 2 (line load) σ z = P / [(B + z) (L + z)] (square footings) Bearing Capacity q all = q ult / FS q max = Q(B + 6e) / B 2 q min = Q(B 6e)/ B 2 6e B /B + 6e L /L 1 q net(ult) = 5.14c u [1 + (0.195 B)/L][1 + (0.4 D f )/B] (cohesive) q net (kn/m 2 ) = (N 60 /0.08) [(B + 0.3)/B] 2 F d (S e /25) (sand) q ult = cn c + 0.5γ t BN γ + γ t D f N q (strip footings) q ult = 1.3cN c + 0.4γ t BN γ + γ t D f N q (square footings) q ult = 1.3cN c + 0.3γ t BN γ + γ t D f N q (circular footings) Foundation Settlement s i = qbi(1 v 2 ) / E u s s = C α H o Δlogt ΔH = 4qB 2 / K v (B + 1) 2 (sand) vi
6 Slope Stability FS = tanϕ / tanβ (infinite slope-cohesionless) FS = c / γzsinβcosβ (infinite slope-cohesive) FS = N o (c) / γ t (H) (Taylor chart) Soil Classification and Boring Log Interpretation GI = (F )[ (LL 40)] (F )(PI 10) PI = LL PL γ d = γ t / (1 + w.c.) γ sat = γ w (G + e) / (1 + e) N 60 = E m C b C s C r N / 0.6 Area Ratio = 100 (D o 2 D i 2 ) / D i 2 Inside Clearance Ratio = 100 (D i D s ) / D s (s u or c u ) = q u /2 w.c. = 100 (mass of water/dry mass of soil) Soil Properties γ b = γ sat - γ w = γ w (G s -1) / (1 + e) e = V v /V s = n/(1 n) n = V v /V = e/(1+e) S = 100 V w /V v τ = σtanϕ (cohesionless) G s = W s /(V s +γ w ) = Se/w.c. τ = c + σtanϕ (mixed) v = ki v s = v/n = ki/n Q = kia = k(δh/l)a = kδh(n f /n d ) k = (2.3aL/At)log 10 (h o /h f ) (falling-head) k = QL/ ΔhAt (constant-head) u = h p γ w Compaction RC = (γ d(field) / γ d(max) ) 100 D r = (e max e) / (e max e min ) 100 Retaining Walls FS = ΣM r / ΣM o (gravity wall-overturning) FS = ΣF r / ΣF D (gravity wall-sliding) σ h = k a γ t H FS = Q ult / Q v (gravity wall) Q ult = B'(cN c d c i c + γdn q d q i q + ½γB'N γ i γ ) (gravity wall) FS = (Wtanδ + P P ) / P A (cantilever wall-sliding analysis and neglecting friction) FS = (Ntanδ + P P ) / P H (cantilever wall-sliding analysis and including friction) FS = ΣM r / ΣM o (cantilever wall-overturning) Mo = P a(h) y o M R = W stem (y o ) + W base (y o ) + W soil (y o ) Q ult = B'(γDN q d q i q + ½γB'N γ i γ ) (cantilever wall-bearing capacity) FS = Q ult / V vii
7 References ASTM. (2012). Annual Book of ASTM Standards. West Conshohocken, PA: ASTM International. Department of the Army (1990). Engineering And Design Settlement Analysis, Design Manual, U.S. Army Corps of Engineers, Washington, DC. Department of the Army (1970). Engineering And Design Laboratory Soils Testing, Engineering Manual, Washington, DC. NAVFAC DM-7.1 (1982). Soil Mechanics, Design Manual 7.1, Department of the Navy, Naval Facilities Engineering Command, Alexandria, Va. NAVFAC DM-7.2 (1982). Foundations and Earth Structures, Design Manual 7.2, Department of the Navy, Naval Facilities Engineering Command, Alexandria, Va. NAVFAC DM-7.3 (1983). Soil Dynamics, Deep Stabilization, and Special Geotechnical Construction, Design Manual 7.3, Department of the Navy, Naval Facilities Engineering Command, Alexandria, Va. viii
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