Order number page 14 940406-171827 set 5 with 1 OFFICIAEGSEONLY Item 23 150. 110. 70. 300. 371. \ REPORT NUMBER AD-A~--109000/0 PATENT ASSIGNEE PUB. DATE (YYMMDD) ERA-07:034634;EDB-82:085118 811000 PRIMARY TITLE (M) Laboratory verification of blast-induced liquefaction mechanism. Final report Jan-Jul’81 PERSONAL AUTHOR (M) Fragaszy, R.J.; Voss, M.E. 34. CLASSIF. LEVEL TEXT unclassified 950. ABSTRACT A mechanism for blast-induced liquefaction was tested in a series of high pressure undrained, isotropic compression tests on saturated samples of Eniwetok beach sand and Ottawa sand. Theory, based on inelastic volume compressibility of sand, was shown to be valid for the case of quasi-static, isotropic loading. Specimens of Eniwetok sand subjected to an initial effective stress of 1 MPa were liquefied by a single cycle of loading of 34 MPa. Specimens of Ottawa sand, tested in the same manner, 801. KEYWORD (S) generated excess pore pressure but not enough to completely liquefy the soil. The errors introduced by flexibility of the testing systems were analyzed and found to be insignificant. Suggestions for future research were made. SAND/liquefaction ;SOILS/liquefaction ;ATOMIC EXPLOSIONS/simulation ; SAND; LIQUEFACTION; SOILS; SOIL MECHANICS; FLUID MECHANICS;HIGH PRESSURE; SATURATION; VOLUME; STATIC LOADS;DYNAMIC LOADS;STRESS AND STRAIN; ENIWETOK; SIMULATION; GROUND MOTION; BLAST DAMAGE; PRESSURE DEPENDENCE Item 24 90. 60. 300. 371. 34. PRIMARY TITLE (A) PERSONAL AUTHOR (A) PATENT ASSIGNEE PUB. DATE (YYMMDD) CLASSIF. LEVEL TEXT 950. ABSTRACT 801. KEYWORD(S) Rain from South and snow from North Miyake, Y. EDB-82:014710 541200 unclassified Detection of nuclear explosions by various methodsincluding observations of fission product activity in the atmosphere is discussed. Deposition of 750 cpm ona vase-line coated paper (30 x 30 cm) on May 13 to 16, 1954 was recorded. Highty-six thousand cpm/l1 was observed in rain at Kyoto on May 14, apparéhtly from the May 5 test at Bikini. RAIN/radioactivity ;SNOW/radioactivity ;ATOMIC EXPLOSION DETECTION/; JAPAN/radiation monitoring ;RAIN; RADIOACTIVITY; SNOW; FISSION PRODUCTS; ATMOSPHERE; FALLOUT; JAPAN; BIKINI; ATOMIC EXPLOSIONS 5003388 CFFICIAL USE ONLY