カルシア改質土による埋立造成 - nssmc.com

1 65 399 2014 1. 2. 10 cm 4 cm wL wL 74 30 vol 1) 1)

2 Reclamation by CaO Improved Soil Yosuke YAMAGOSHI Yuzo AKASHI Hiroki KANNO Nobuhiro TAKAGI Yuichi TANAKA 1 2 3 4 Abstract CaO-improved soil suits with construction material of reclamation, because of its strength and aseismicity.

3 In this study, we examined soil characteristics, and reclaimed artificial ground made of dredged soil and steelmaking slag by using pipe mixing method for the first time. From the result of the survey, 1) Long term consolidation settlement of CaO-improved soil is shorter than sand, CaO-improved soil is not liquefaction. 2) Designing of mix propotion of CaO-improved soil is as same as cement stabilization. 3) Unit weight and short-time strength were useful for predicting sustained strength. 4) Strength of cone and surface wave velocity were useful for assessing ground strength.

4 * 299-1141 UDC 627 . 74 . 669 . 184 . 28 : 627 . 53 399 2014 66 Pc qu Pc qu wL 89 25 vol C /Cc 1) C /Cc 2) C /Cc 1 10 wL 89 25 vol 1) 1)

5 1995 Dr 50 Dr 90 Dr 50 Dr 90 1)Experiment of consolidation Pc qu 1)Relationship between consolidation yield stress and unconfined compressive strength C /Cc1)Ratio of second coefficient of consolidation and compressive index of CaO-improved soilRatio of duration time and finish time of first consolidationt/tp = 10t/tp = 100 Load of 1)Relationship between cyclic shear stress ratio and cyclic loading stress times 1)

6 Result of cyclic undrained triaxial test 399 2014 67 25 mm mm wL 89 25 vol 1) mm 25 mm 25 mm 10 7 10 6 cm/s 3. 2012 m3 2013 41 m3 2) 2) 75 25 - 1)

7 Relationship between stress and strain of CaO-improved soil Coefficient of permeability of soilSandSiltClayCoefficient of permeability(cm/s)10 210 510 7 Coefficient of permeability of CaO-improved soil Plan of reclamation work Cross section of reclamation work 399 2014 68 800 mm 300 m 2) pH SS 4.

8 JIS A 5001 CS-20 2) 10 2) A B 2009 ETV 3) 2)Air pressure type transfer vessel 2)Location of reclamation 2)Situation of pouring 2)Situation of measuring steelmaking slag 2)Flow of reclamation work 2)Physical properties of dredged soil and steelmaking slagUnitDredged soilSteelmaking slagArea AArea BSoil density limitwL% limitwP% size distribution(%)Grabel-% grain density- lossLi% water contentw0% water content/liquid limitw0 399 2014 69 5.

9 11 4) quck qu n quck 1 quck qul qul qul =quck 1 1 quck 30 kN/m2 25 5) 1 qul 60 kN/m2 JHS A 313 90 110 mm A wL wL 30 30 qul 60 kN/m2 12 2)

10 30 35 28 25 84 qul 60 kN/m2 13 2) 90 120 mm 25 1 5) 10 2)Gradation curve 11 4)Relationship between criteria and defective ratio 12 2)Unconfined compressive strength of laboratory 399 2014 70 quck 30 kN/m2 30 48 kN/m2 15 28 14 2) 114 kN/m2 28 48 kN/m2 15 2 15 100 13 25 2 4, 5) 15 2)