Shear behavior of sand-expanded polystyrene beads lightweight fills

Abstract

Sand-expanded polystyrene (sand-EPS) beads lightweight fills are geomaterials formed by blending sands and EPS beads. Through direct shear and triaxial compression tests, effects of EPS ratios and stress status on materials' shear behavior were investigated. The shear behavior is marginally associated with the EPS ratios and normal/confining stresses. Hyperbolic curves were used to fit relationship between shear stress and shear displacement. Increases of EPS ratios and decreases of normal/confining stresses result in shear strength decreases. The shapes of Mohr-Coulomb's envelope include linear and piecewise linear types, which are basically determined by the EPS ratio. Such difference is thought related to the embedding or apparent cohesion effect under relatively high EPS ratio conditions. Shear strength parameters were presented to be used for further modeling and design purposes.

Dynamic Modulus and Damping Ratio of Eps Composite Soil Under Small Strain Condition

“…Over the past twenty years, numerous tests have been conducted on EPS composite soil to study its physical and mechanical characteristics including unconfined compression tests, uniaxial compression tests, direct shear tests, and triaxial compression tests [4][5][6][7]. The mixing ratio and its influence on the strength, deformation and failure modes for EPS composite soil were investigated and discussed [8,9].…”

بررسی آزمایشگاهی رفتار مخلوط خاک - دانه‌های Eps مسلح با ژئوتکستایل محصور در لنز ماسه‌یی

“…}DQD x@ [16w15] (ASTM D4253 14) w l=N |xv}tm w xv}W}@ pNrND Q}O=kt "OvOW |Q}oxR=Ov= |Q}oxR=Ov= Q=@ 3 u}ov=}t "OvDUy 0 547 w 0 865 ? }DQD x@ u; |r=oJ |xv}tm w xv}W}@ Q}O=kt x@ xHwD =@ |xU=t Q=DiQ x@ sm = QDt |xU=t Q=DiQ R= xvwtv Q=DiQ Q}}eD ut[ 'xU=t x@ EPS Qo}O C=ar=]t u}vJty "O@=}|t Vy=m xvwtv ptLD p@=k |i=QLv= VvD 'CU ) U R= xO=iDU= =@ EPS |=yxv=O -xU=t \wrNt |WQ@ Q=DiQ |wQ [10] '2008 u=W}= '\wrNt QO EPS |=yxv=O OYQO V}=Ri= =@ xm OyO|t u=Wv s}kDUt VQ@ V}=tR;…”

“…Q[ %IF 1 &" i VvQm R= QD QO KrUtQ}e \wrNt \wrNt |xvwtv x@ C@Uv |}xU=t Rvr =@ \wrNt |xvwtv Q=DiQ Ow@y@ ?} Q[ %IF 2 "" i VvQm R= QD QO KrUtQ}e """ EPS |=yxv=O -l=N \wrNt Q=DiQ |y=oW}=tR; |UQQ@ "VvQm hrDNt Kw]U QO |}xU=t Rvr |=yx}q O=OaD =@ IF 2 C= Q}}eD "5 pwOH VvQm 2 274 1 628 1 504 1 292 3 IF 2 2 041 1 621 1 426 1 307 6 1 865 1 516 1 348 1 218 9 1 777 1 473 1 331 1 186 12 1 710 1 445 1 315 1 [11] '2016 u= Q=mty w |Q=vJ w [10] '2008 ) ==}S w nvO [1]…”