CHARACTERIZATION OF SOFT CLAY- A CASE STUDY AT CRANEY ISLAND
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1 National Defense Industrial Association 2005 Tri-Service Infrastructure Systems Conference and Exhibition Re-Energizing Engineering Excellence CHARACTERIZATION OF SOFT CLAY- A CASE STUDY AT CRANEY ISLAND AARON L. ZDINAK, P.E. Virginia Geotechnical Services, P.C. Richmond, Virginia August 4, 2005
2 THIS MADE POSSIBLE BY: USACE - NORFOLK DISTRICT MATTHEW BYRNE, IRA BROTMAN, DAVID PEZZA, CHERYL FROMME (ALL P.E.s) PROJECT OWNER (COORDINATED FUNDING) PROJECT DEVELOPMENT VIRGINIA GEOTECHNICAL SERVICES, P.C. ENTIRE GEOTECHNICAL GROUP (AND A FEW OTHERS) EXECUTION OF SCOPED SERVICES DR. J. MICHAEL DUNCAN, P.E. SENIOR TECHNICAL CONSULTANT FOR CHARACTERIZING SOFT SOILS (CHARACTERIZATION TECHNIQUES, INTERPRETATION OF DATA, CONCEPTUAL APPLICATIONS OF ENGINEERING TECHNOLOGY). SUBCONSULTANTS FUGRO GEOSCIENCES (SPT/FVS/CPT) INSITU SOIL TESTING, INC. (DMT) GLENN & SADLER (EXPLORATION LOCATIONS/SURVEY) OCEAN SURVEYS, INC. (GEOPHYSICAL SURVEY) COORDINATION WITH NUMEROUS OTHERS
3 INTRODUCTION WHERE IS CRANEY ISLAND? WHAT IS CRANEY ISLAND? PROJECT INFORMATION APPROACH TO SUBSURFACE CHARACTERIZATION RESEARCH FIELD EXPLORATIONS LABORATORY TESTING RESULTS INTERPRETATION APPLICATIONS CONCLUSIONS SUMMARY PRESENTATION GUIDE
4 WHERE IS THIS FACILITY? USACE DREDGE MANAGEMENT AREA - CRANEY ISLAND
5 WHAT IS CRANEY ISLAND? 2,500 ACRE DREDGE MANAGEMENT FACILITY CONSTRUCTION BEGAN IN AUGUST 1954 COMPLETED IN JANUARY 1957 MUDLINE AT EL. -10 (MLLW), BERMS EL. 8 TODAY TOP OF FILL APPROXIMATELY EL. 40
6 1953 GENERAL DESIGN MEMORANDUM
7 TODAY
8 SEPTEMBER 28, 1954
9 PROJECT SCOPE TEAM WITH USACE TO COMPLETE CRANEY ISLAND EASTWARD EXPANSION FEASIBILITY STUDY (2000) PREPARATION OF WORK PLAN TO COMPLETE FEASIBILITY STUDY EXECUTION OF SUBSURFACE EXPLORATION PROGRAM COMPLETION OF LABORATORY TESTING PROGRAM CHARACTERIZATION OF SUBSURFACE CONDITIONS IDENTIFICATION OF APPLICABLE GROUND MODIFICATION TECHNOLOGIES AND CONSTRUCTION TECHNIQUES TO FACILITATE EXPANSION
10 PROJECT CONSTRAINTS EASTWARD EXPANSION OF DREDGE MANAGEMENT FACILITY TO INCREASE PLACEMENT AREA WITH A VERTICAL CONTAINMENT FACE. SHORT CONSTRUCTION PERIOD TOTAL POST CONSTRUCTION SETTLEMENT < 2 ELASTIC CONSOLIDATION SECONDARY
11 PROJECT APPROACH DEVELOP GEOTECHNICAL ENGINEERING QUESTIONS CAN EMBANKMENT CONSTRUCTION BE ACCOMPLISHED? CAN CONSOLIDATION OCCUR QUICKLY ENOUGH? CAN TOTAL SETTLEMENTS LESS THAN 2 THROUGHOUT LIFE OF THE FACILITY (SECONDARY SETTLEMENT) BE ACHIEVED? IDENTIFY INFORMATION TO HELP ANSWER QUESTIONS SHEAR STRENGTH PROFILE CONSOLIDATION PARAMETERS SECONDARY COMPRESSION CHARACTERISTICS WHAT CALCULATIONS DOES THE DATA SUPPORT? STABILITY MAGNITUDE AND TIME RATE OF SETTLEMENT SECONDARY COMPRESSION
12 PROJECT TASKS RESEARCH: WHAT HAS BEEN DONE? PREVIOUS STUDIES ANTICIPATED GEOLOGY FIELD EXPLORATIONS: WHAT ARE OUR CONDITIONS? SHEAR STRENGTH PROFILE CONSOLIDATION PARAMETERS SECONDARY COMPRESSION CHARACTERISTICS LABORATORY TESTING: THE REAL ANSWER? SHEAR STRENGTH (UNDRAINED AND DRAINED) SETTLEMENT (PRIMARY AND SECONDARY) BASIC AND INDEX SOIL PROPERTIES HOW DOES IT ALL FIT TOGETHER?
13 FIELD EXPLORATIONS - GOALS STRATIGRAPHY SOFT MARINE SEDIMENTS TRANSITION ZONE MEDIUM DENSE SANDS OF THE YORKTOWN FORMATION SAMPLE COLLECTION LIMIT DISTURBANCE COLLECT DATA OVERWATER AND OVERLAND
14 STRATIGRAPHY FIELD EXPLORATIONS - TOOLS SPT BORINGS - SAMPLE EVERY 120 DMT SOUNDINGS - SAMPLE EVERY 8 CPT SOUNDINGS - SAMPLE EVERY 0.75 SAMPLE COLLECTION SPLIT SPOON SAMPLER PUSHED LINER SAMPLER 5 PISTON TUBE SAMPLER IN SITU DATA SPT - BASIC AND INDEX PROPERTIES FVS - MOBILIZED UNDRAINED SHEAR STRENGTH CPT - CORRELATION TO UNDRAINED SHEAR STRENGTH DMT - DRAINED FRICTION ANGLE IN SANDS
15 EXPLORATION PLAN
16 FIELD EQUIPMENT
17 OVERLAND SPT SPT SUMMARY 380 FEET OF DRILLING AT THREE LOCATIONS 11 FIVE-INCH DIAMETER PISTON TUBES NO FVS TESTS 5 DAYS OVERWATER SPT 710 FEET OF DRILLING AT SIX LOCATIONS 23 FIVE-INCH DIAMETER TUBES 23 FVS TESTS 13 DAYS DRILLING, 3 DAYS LOST TO WEATHER (16 DAYS) SPT PRODUCTION RATE (SAMPLING EVERY 10 ) OVERLAND = 75 FEET PER DAY OVERWATER = 45 FEET PER DAY
18 CPT AND DMT SUMMARY OVERLAND DMT (SAMPLING EVERY 8 ) 370 FEET OF SOUNDING AT THREE LOCATIONS 3 DAYS RATE = 125 FEET PER DAY (65% FASTER THAN SPT) OVERLAND CPT (SAMPLING EVERY 0.75 ) 402 FEET OF SOUNDING AT THREE LOCATIONS 1 DAY RATE = 400 FEET PER DAY (430% FASTER THAN SPT) OVERWATER CPT (SAMPLING EVERY 0.75 ) 2,731 FEET OF SOUNDING AT 27 LOCATIONS 8 DAYS RATE = 340 FEET PER DAY (660% FASTER THAN SPT) NO PHYSICAL SAMPLE RECOVERY
19 LABORATORY TESTING - GOALS CHARACTERIZE STRENGTH AND COMPRESSABILITY PARAMETERS SOFT CLAY TRANSITION ZONE MEDIUM DENSE SANDS OF THE YORKTOWN FORMATION CONFIRM RESULTS OF FIELD TESTING UNDRAINED SHEAR STRENGTH RELATIVE TO FVS CONFIRM QUALITY OF PREVIOUS STUDY DATA GENERAL DATA TRENDS UNDRAINED SHEAR STRENGTH PROFILE SETTLEMENT PARAMETERS EFFECTIVE STRESS PROFILE UNDER EAST BERM
20 SUMMARY OF LABORATORY TESTING BASIC AND INDEX SOIL PROPERTIES MOISTURE CONTENT, LIMITS, GRADATION, ETC. SHEAR STRENGTH PARAMETERS CU AND UU TRIAXIAL TESTING, LABORATORY VANE COMPRESSABILITY CHARACTERISTICS 1-D CONSOLODATION CONCLUSIONS LABORATORY TESTING PROGRAM YIELDED QUALITY DATA DISTURBANCE WAS LIMITED BY COLLECTING LARGE DIAMETER SAMPLES AND TRIMMING LABORATORY TESTING LESSONS DON T SPEND TIME AND MONEY TESTING DISTURBED SAMPLES REQUIRED LABORATORY RETRO-FIT WAS LIMITED QUALITY OF TESTS ARE HIGHLY DEPENDENT ON PROCEDURES
21 STRATIGRAPHY RESULTS SOFT CLAY TRANSITION ZONE MEDIUM DENSE SANDS OF THE YORKTOWN FORMATION IN SITU DATA AND LABORATORY DATA UNDRAINED SHEAR STRENGTHS CONSOLIDATION CHARACTERISTICS EFFECTIVE STRESS PROFILE (OVERLAND) UNDERCONSOLIDATED CPT AND LABORATORY DATA COME TOGETHER
22 STRATIGRAPHY: 3-D SURFACE
23 STRATIGRAPHY: NORTH-SOUTH LINE
24 STRATIGRAPHY: EAST-WEST LINE
25 UNDRAINED SHEAR STRENGTH TEST RESULTS
26 CONSOLIDATION TEST RESULTS COMPRESSION INDEX TO RECOMPRESSION INDEX = 10 NORMALLY CONSOLIDATED AVERAGE C V = 23 FT 2 /YR OVERCONSOLIDATED AVERAGE C V = 151 FT 2 /YR NORMALLY CONSOLIDATED AVERAGE C = 0.02 OVERCONSOLIDATED AVERAGE C = 0.003
27 EFFECTIVE STRESS PROFILE UNDER EAST BERM
28 SUMMARY OF OVERLAND ENGINEERING PARAMETERS
29 SUMMARY OF OVERWATER ENGINEERING PARAMETERS
30 APPLICATIONS - WHAT DOES IT ALL MEAN? QUESTIONS CAN EMBANKMENT CONSTRUCTION BE ACCOMPLISHED? CAN CONSOLIDATION OCCUR QUICKLY ENOUGH? CAN TOTAL SETTLEMENTS LESS THAN 2 THROUGHOUT LIFE OF THE FACILITY (SECONDARY SETTLEMENT) BE ACHIEVED? CAN A BENEFICIAL CONSTRUCTION ALTERNATIVE BE ACHIEVED? ANSWERS YES - ORIGINAL CONSTRUCTION WAS COMPLETED IN 3.5 YEARS. THE AREA OF PROPOSED EXPANSION IS FOUR TIMES SMALLER. YES - WILL REQUIRE THE USE OF PV DRAINS. YES - SURCHARGING CAN LIMIT POST CONSTRUCTION SETTLEMENTS TO <2. YES - PV DRAINS, GROUND IMPROVEMENT AND SURCHARGING CAN FACILITATE RAPID CONSTRUCTION OF ADDITIONAL DREDGE PLACEMENT AREA.
31 CONCEPTUAL CROSS SECTION - PROVEN
32 CONCEPTUAL CROSS SECTION - INNOVATIVE
33 COMPARISON OF CONCEPTUAL SECTIONS PV DRAINS AND SURCHARGE TOTAL ADDITIONAL MANAGEMENT VOLUME = 13.4 MILLION YD 3 ESIMTATED PROBABLE CONSTRUCTION COST= X DOLLARS APPROXIMATE COST PER UNIT VOLUME ADDITIONAL MANAGEMENT SPACE = Y DOLLARS PER YD 3 DEEP SOIL MIXING, PV DRAINS, AND SURCHARGE TOTAL ADDITIONAL MANAGEMENT VOLUME = 21.0 MILLION YD 3 ESIMTATED PROBABLE CONSTRUCTION COST = 85% X DOLLARS APPROXIMATE COST PER UNIT VOLUME ADDITIONAL MANAGEMENT SPACE = 50% Y DOLLARS PER YD 3 CONCLUSION AN INNOVATIVE APPROACH CAN SUBSTANTIALLY INCREASE THE AREA AVAILABLE FOR DREDGE MANAGEMENT BEYOND THAT POSSIBLE WITH TRADITIONAL CONSTRUCTION METHODS.
34 CONCLUSIONS COST OF A DETAILED SUBSURFACE INVESTIGATION PROGRAM WAS LESS THAN 1/10 OF A PERCENT OF AN ESTIMATED CONCEPTUAL COST. SUBSURFACE CONDITIONS IN THE VICINITY OF CRANEY ISLAND ARE FAIRLY CONSISTENT AND CAN BE CHARACTERIZED WITH CURRENT EXPLORATION TECHNIQUES. USE OF A JACK-UP BARGE, FULLY CASED DRILLING METHODS, AND LARGE DIAMETER SAMPLES ARE PROVEN WAYS TO LIMIT SAMPLE DISTURBANCE. THE CPT CAN BE AN EFFECTIVE TOOL FOR RAPIDLY CHARACTERIZING STRATIGRAPHY AND UNDRAINED SHEAR STRENGTH AT CRANEY ISLAND. THE CPT CAN BE AN EFFECTIVE TOOL TO DETERMINE % CONSOLIDATION UNDER FILL AREAS.
35 SUMMARY A PROJECT APPROACH CONSISTING OF RESEARCH, FIELD EXPLORATIONS, AND LABORATORY TESTING YIELDED THE DESIRED RESULTS FOR THIS STUDY. UTILIZATION OF MULTIPLE EXPLORATION TECHNIQUES RESULTED IN AN EFFICIENT FIELD DATA COLLECTION PROGRAM. HIGH QUALITY LABORATORY TESTING IMPROVED CONFIDENCE IN THE RESULTS OF THE FIELD DATA. THE SOIL PROPERTIES AND PARAMETERS DETERMINED BY THIS EFFORT ARE CONSISTENT WITH PREVIOUS EFFORTS. A BENEFICIAL EASTWARD EXPANSION COULD BE ACHIEVED BY USING AN INNOVATIVE APPROACH.
36 CHARACTERIZATION OF SOFT CLAY- A CASE STUDY AT CRANEY ISLAND THANK YOU! Aaron L. Zdinak, P.E. alzdinak@vgspc.com Virginia Geotechnical Services, P.C Hermitage Road Richmond, VA
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