報告書番号

380003

タイトル（和文）

大型マットコンクリート基礎・砂レキ地盤の相互作用（その１）－振動台基礎地盤の原位置調査による静的・動的物性－

タイトル（英文）

STUDY ON THE INTERACTION BETWEEN LARGE MAT CONCRETE FOUNDATION AND SAND GRAVEL GROUND (1) -IN SITU TEST FOR STATIC AND DYNAMIC PROPERTIES OF THE GROUND NEAR THE MAT FOUNDATION OF THE SHAKING TABLE-

概要 （図表や脚注は「報告書全文」に掲載しております）

原子力工学試験センターの大型振動台は砂礫を主体とした洪積地盤上に建設されている。本研究は各種の原位置調査・試験法を用いて振動台基礎地盤の地層構造と地盤の物性値を求め振動応答解析に資する目的で実施した。各種の調査・試験法を用いて地盤の深さ方向の各地層ごとに変形特性値が得られた。この結果を用いて地表から深さ３９ｍまでの５層の地盤構造モデルを示した。この調査には当所で開発した「動的地盤係数測定装置」により地盤の動的物性値を求めたが，砂礫層の調査では加圧部のゴムが破れるなど困難な点があった。今回の調査では加圧部の保護方法等を工夫して目的を達したが，今後とも孔壁加圧試験法の砂礫地盤への適用技術の向上が課題となる。

概要 （英文）

THIS REPORT DESCRIBES ON THE RESULT OF DYNAMIC AND STATIC PROPERTIES OF GROUND NEAR A MAT FOUNDATION OF A SHAKING TABLE THROUGH IN SITU TEST AND SURVEY. THE MAT FOUNDATION OF A LARGE SHAKING TABLE AT ATOMIC POWER ENGINEERING RESEARCH CENTER IS CONSTRUCTED ON A DILUVIAL DEPOSIT THAT WERE UNDER LAIN BY A GRANITE 180METER FROM GROUND LEVEL. PARTICULARY THE GROUND NEAR THE MAT FOUNDATION IS A SAND GRAVEL THE MAXIMUM DIAMETER OF WHICH IS 70 MILLI METER. DYNAMIC MATERIAL PROPERTIES OF THE SAND GRAVELS WERE NOT AVAILABLE ON ACCUNT OF THE DIFFICULTIES OF THE DIGGING AND THE CUTTING WITHOUT DISTURBANCE. THEREFORE IN ORDER TO GET THE DYNAMIC AND STATIC PROPERTIES OF THE IN SITU GROUNDWE USED SEVERAL METHODS OF TESTS AS BELOW. (1) STATIC AND DYNAMIC PRESSURE METER TESTS THROUGH THE BOREHOLE WALL. (2) SEISMIC VELOSITY TEST.(DOWN HOTE METHOD) (3) PLATE BEARING TEST. (DIAMETER OF PLATE IS 60CM) (4) IN SITU DENSITY TEST. (SAND REPLACEMENT METHOD) (5) STANDARD PENETRATION TEST. (6) THE CONTINUAL PENETRATION TEST BY ROTARY BORING. (7) THECYCLIC TRIAXIAL TEST. THE RESULTS OF THIS RESEARCH ARE SUMMARIZED AS FOLLOWS. (1) WE HAD THE STATIC AND DYNAMIC PROPERTIES OF THE VARIOUS DEPOSITS FOR 60 METER UNDER GROUND LEVEL.(SEE FIG 8-4) (2) THE STRAIN DEPENDENT VARIATIONS OF THE MODULUS ARE IN GOOD AGREEMENT AMONG DIFFERENT TEST METHODS.(SEE FIG 8-3) (3) IN ORDER TO OFFER INPUT DATA FOR THE SIMULATION OF EARTHQUAKE RESPONSE OF THE MAT FOUNDATION AND THE GROUND, WE IDEALIZES THE DYNAMIC PROPERTIES OF THE GROUND WITH HARDIN-DRNEVICH MODEL.(SEE TABLE8-2)

報告者

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