報告書番号

384030

タイトル（和文）

護岸基礎捨石マウンドの沈下予測（その１）－捨石マウンド材料の物理特性ならびに静的力学特性－

タイトル（英文）

PREDICTION OF SETTLEMENT OF RUBBLE MOUND AS REVETMENT FOUNDATION (1) -PHYSICAL AND STATIC MECHANICAL CHARACTERISTICS OF RUBBLE MATERIAL-

概要 （図表や脚注は「報告書全文」に掲載しております）

臨海地域における大規模な火力・原子力発電所には，捨石マウンドを用い護岸等の構造物が造られる。このような構造物の常時安定性を検討するために，捨石マウンド材料（花こう岩の砕石）について，（１）物理試験，（２）三軸圧縮試験，（３）一次元圧縮試験を実施した。その結果，（１）粒子形状は粒径が大きくなるに従い葉状から球状に近づく傾向にあり最大密度もやや大きくなり，また，（２）せん断強度はモール・クーロンの破壊基準で表示すると，内部摩擦角は３５～３６度，粘着力はゆる詰めで１９．６ｋＰａ，密詰めで５８．８ｋＰａとなり，さらに，（３）一次元圧縮特性については初期載荷時における鉛直応力と鉛直ひずみが両対数上でほぼ直線関係を示し，その時の鉛直ひずみは初期間隙比と良い相関を示した。これらの結果は，捨石マウンドの常時沈下量の推定および捨石マウンドのすべり安定性評価に適用される。

概要 （英文）

THE EVALUATION ON STABILITY OF RUBBLE MOUNDSAS FOUNDATION IN SEASIDE POWER PLANTS OF THERMAL AND NUCLEAR IS IMPORTANT SUBJECT,ESPECIALLY THEIR SETTLEMENT THAT THEY ARE DEEP AND THERE ARE IMPORTANT STRUCTURES,E.G.BREAKWATER,ON THEM IS MUCH MORE. ON THE ONE HAND,THE EVALUATION ON STABILITY OF SLIP FAILURE IN THE RUBBLE MOUNDS IS IMPORTANT TOO. IN THE POINT OF VIEW,TESTS ARE PERFORMED TO CRUSHED STONE(MATERIALS OF RUBBLE MOUNDS;GRANITE)ON PURPUS TO PREDICT STATIC SETTLEMENTS OF RUBBLE MOUNDS AND GET PARAMETERS OF STATIC ANALYSIS. THEY ARE (1)TESTS OF PHYSICAL PROPERTIES,(2)TRIAXIAL COMPRESSION TRESTS(SINGLESTAGE TRIAXIAL COMPRESSION TESTS,MULTIPLE STAGE TRIAXIAL COMPRESSION TESTS),(3)ONE-DIMENSIONAL COMPRESSION TESTS(ON DEVELOPPING NEW TYPE APPARATUS). OBTAINED TEST RESULTS ARE AS FLLOWS.(1)AS INCREASING PARTICLE SIZE,PARTICLE SHAPE BECOME FROM FLAT TO ROUND,MAXIMUM DRY DENSITY IS MORE OR LESS LARGE,MINIMUM DRY DENSITY IS NEARLY EQUAL. (2)ON THE TRIAXIALCOMPRESSION TESTS,THE STRESS-STRAIN CURVES IN SINGLE STAGE TRIAXIAL COMPRESSION TESTS ARE DIFFERENT FROM THAT IN MULTIPLE STAGE TRIAXIAL COMPRESSION TESTS,BUT FAILURE STRESSES ARE BOTH NEARLY EQUAL,SO MULTIPLE STAGE TRIAXIAL COMPRESSION TEST IS RECOGNIZED USEFUL TESTS TO GETTING FAILURE STRESS. ACCORDING TO MOHR-COULOMB FAILURE LAW,THE INTERNAL FRICTION ANGLE IS 35 36DEG.,THE COHESION IS 19.6KPA IN A LOOSE STATE, 58.8KPA IN A DENSE STATE. (3)ON THE ONE-DIMENSIONAL COMPRESSION TESTS,THE RELATIONSHIPS BETWEEN VERTICAL STRAIN AND VERTICAL STRESS IN VIRGIN COMPRESSION ARE A STRAIGHT LINE ON THE LOG-LOG SCALE. AND SO THE VERTICAL STRAIN AND INITIAL VOID RATIO CORRELATE WELL TO EACH OTHER. FROM THEIR RESULTS,PREDICTION OF STATIC SETTLEMENT AND STABILITY OF SLIP FAILURE IN THERUBBLE MOUNDS ARE EVALUALED

報告者

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